Source: https://patents.google.com/patent/JP5249991B2/en
Timestamp: 2019-11-13 18:47:34
Document Index: 79894344

Matched Legal Cases: ['art 110', 'art 102', 'art 1', 'art 2', 'art 3', 'art 104', 'art 106']

JP5249991B2 - Positioning apparatus and method - Google Patents
Positioning apparatus and method Download PDF
JP5249991B2
JP5249991B2 JP2010121004A JP2010121004A JP5249991B2 JP 5249991 B2 JP5249991 B2 JP 5249991B2 JP 2010121004 A JP2010121004 A JP 2010121004A JP 2010121004 A JP2010121004 A JP 2010121004A JP 5249991 B2 JP5249991 B2 JP 5249991B2
JP2010121004A
JP2011247738A (en
2010-05-26 Application filed by 株式会社エヌ・ティ・ティ・ドコモ filed Critical 株式会社エヌ・ティ・ティ・ドコモ
2010-05-26 Priority to JP2010121004A priority Critical patent/JP5249991B2/en
2011-12-08 Publication of JP2011247738A publication Critical patent/JP2011247738A/en
2013-07-31 Publication of JP5249991B2 publication Critical patent/JP5249991B2/en
The present invention relates to a positioning device.
As one of high-precision positioning technologies, the Global Positioning System (GPS) is known. GPS is a positioning technology that uses radio waves transmitted by GPS satellites. In GPS, the positioning error increases indoors where the number of visible satellites available for positioning is small. For example, indoors, the positioning error may be several hundred meters. In addition, positioning itself may be impossible.
In order to realize high-precision positioning not only outdoors but also indoors, positioning technology using wireless LAN (WLAN: Wireless Local Area Network) (hereinafter referred to as “WLAN positioning”) has attracted attention.
WLAN positioning estimates position using radio wave information from a WLAN access point. Since WLAN positioning does not connect to WLAN access points, positioning can be performed for all WLAN access points that can use radio wave information.
JP 2008-306464 A Special table 2009-536808
In WLAN positioning, a database in which the location of WLAN access points is registered is used. For example, the installation position may be estimated based on radio waves from a WLAN access point measured at a plurality of points. For example, it may be estimated based on the received signal strength.
The positioning device acquires the identifier of the WLAN access point from the radio wave to be transmitted by the WLAN access point. The positioning device acquires information on the installation position of the WLAN access point corresponding to the identifier from the database. The positioning device identifies the position of the positioning device based on the installation position information.
The positioning device can ensure the reliability of the positioning result by WLAN positioning by frequently scanning the WLAN access point.
Moreover, the database administrator can ensure the reliability of the positioning result by WLAN positioning by frequently updating the database.
However, frequent scanning of WLAN access points increases power consumption. In addition, it is practically difficult for a database administrator to manage all locations of a WLAN access point. As a method of increasing the number of WLAN access points registered in the database, there is a method of allowing registration by a general user, but it is managed whether the registration is by a malicious user or a non-malicious user It is difficult for a person to judge. Therefore, it is not preferable to adopt a method for allowing registration by a general user.
Whether or not the position specified by the WLAN positioning is a reliable position depends on whether or not the installation position of the WLAN access point registered in the database is correct. For example, when a WLAN access point is moved to a completely different location, if the installation position registered in the database is not changed, positioning is performed with the installation position of the WLAN access point as the installation position before the movement. As a result of positioning as the installation position before movement, the position of the positioning device is specified at a position completely different from the actual position.
Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a positioning apparatus and method that can determine whether or not a position specified by WLAN positioning is reliable.
This positioning device
A positioning device for measuring a position,
WLAN positioning calculation unit that performs positioning based on the radio wave from the access point,
A satellite positioning unit that performs positioning based on radio waves from positioning satellites;
And the satellite due Ri acquired Ru position to the positioning unit to置情report or al a predetermined range, the WLAN positioning calculation unit determines the positioning result whether the positioning result is present by the determining unit,
The range of the predetermined from the position information by The positioning result determining unit, when the positioning result by the WLAN positioning calculation unit is present, and the WLAN positioning calculation unit by position measuring you adopt positioning result result adoption determination section Yes, and
The position information, Ru contains position information based on base station area information acquired when the positioning by A-GPS method is performed.
A method in a positioning device for measuring a position, comprising:
WLAN positioning calculation step for positioning based on the radio wave from the access point,
A satellite positioning step for positioning based on radio waves from positioning satellites;
The satellite positioning acquired Ru position置情paper or al a predetermined range Ri by the step, the measurement result determination step of determining whether the positioning result is present by the WLAN positioning calculation step,
The predetermined range from the position information by the measurement result determination step, when the positioning result by the WLAN positioning calculation step is present, and the WLAN positioning calculation measurement of the result adoption determination step you adopt a positioning result by the step Yes, and
According to the disclosed positioning apparatus and method, it is possible to determine whether or not the position specified by the WLAN positioning is reliable.
It is explanatory drawing which shows an example of the system according to a present Example. It is a block diagram which shows an example of the hardware constitutions of the measuring apparatus according to a present Example. It is a functional block diagram which shows an example of the positioning apparatus according to a present Example. It is explanatory drawing (the 1) for demonstrating the determination method of the reliability of the positioning result according to a present Example. It is explanatory drawing (the 2) for demonstrating the determination method of the reliability of the positioning result according to a present Example. It is explanatory drawing (the 3) for demonstrating the determination method of the reliability of the positioning result according to a present Example. It is explanatory drawing (the 4) for demonstrating the determination method of the reliability of the positioning result according to a present Example. It is a flowchart which shows an example of operation | movement of the system according to a present Example. It is a flowchart which shows an example of operation | movement of the positioning apparatus according to a present Example.
A system to which the positioning device 100 according to the present embodiment is applied will be described.
FIG. 1 shows a system to which the positioning device 100 is applied.
The system includes an access point 200 m (m is an integer of m> 0). An access point may be referred to as a “base unit”, “base station”, “station”, or the like. The positioning apparatus 100 performs positioning based on the distance to the access point 200 m that has been found. FIG. 1 shows a case where m = 3 as an example. m may be 2 or less, or 4 or more. For example, when m = 1, 2, an area where the positioning device 100 is assumed to be located can be obtained from the distance between the access point 200 m and the positioning device 100. Also, the positioning accuracy improves as the value of m increases.
The positioning device 100 may be installed in a portable terminal device, may be installed in a personal digital assistant (PDA), or may be installed in a personal computer (PC). You may make it mount.
Positioning information can be acquired even indoors by positioning the positioning device 100 based on the distance from the access point 200 m that is mounted on the mobile terminal device and found. Since position information can be acquired even indoors, services can be provided based on indoor position information.
Further, the positioning device 100 measures the position of the positioning device 100 based on a positioning signal transmitted by the GPS satellites 300 1 to 300 n (n is an integer of n> 3). The position information may be represented by longitude and latitude. Further, it may be indicated by altitude.
For example, the positioning device 100 may perform positioning by an independent positioning method. In the self-supporting positioning method, information necessary for positioning calculation is acquired by decoding a positioning signal. Currently, about 30 GPS satellites orbit the earth at an altitude of about 20,000 km, there are six orbiting planes inclined by 55 degrees, and four or more GPS satellites are equally in each orbital plane. Is arranged. Therefore, as long as the sky is open, at least 5 GPS satellites can be observed at any time on the earth.
Further, for example, the positioning device 100 may perform positioning using an assisted GPS (A-GPS) method. In A-GPS, data required for the positioning device 100 to perform positioning is distributed from a network (not shown). The data may be referred to as assist information. The said data, for example, and the like orbit information area information and GPS satellites 300 n of the base station. The area information of the base station includes approximate position information of the positioning device 100, information related to an error in the approximate position, and the like. With this data, the process of decoding the positioning signal can be omitted.
<This positioning device>
FIG. 2 shows a positioning device 100 according to the present embodiment. FIG. 2 mainly shows a hardware configuration.
The positioning device 100 includes a radio unit 102, a storage unit 104, a central processing unit (CPU) 106, an output unit 108, a communication control unit 110, and a GPS positioning device 112. Each functional block is connected by a bus 150.
The central processing unit 106 controls the wireless unit 102, the storage unit 104, the output unit 108, the communication control unit 110, and the GPS positioning device 112. The central processing unit 106 functions according to a program stored in the storage unit 104 and performs predetermined processing.
The wireless unit 102 performs wireless communication with the access point 200 m by a predetermined wireless communication method under the control of the central processing unit 106. The wireless communication system includes a wireless LAN. Wireless LAN standards include IEEE802.11 and IEEE802.15, but any standard may be used. The radio unit 102 converts the information generated by the communication control unit 110 into a radio signal and transmits the radio signal. Further, the radio signal from the access point 200 m is converted into a baseband signal. The wireless unit 102 measures a received signal strength indication (RSSI) received from the access point 200 m .
The storage unit 104 has an application. The application is software having a function of performing work executed on the positioning device 100. Further, the storage unit 104 stores information on access points discovered for each channel. Further, the storage unit 104 stores identifiers of access points 200 m that can be set in the positioning device 100. The identifier includes a service set ID (SSID) and an ESSID (Extended SSID). Any identifier that can identify an access point is not limited to a service set ID (SSID) or an ESSID (Extended SSID).
The output unit 106 outputs the position information calculated by the positioning device 100. For example, you may make it output with respect to the apparatus which mounts the said positioning apparatus 100. FIG. By outputting to the device on which the positioning device 100 is mounted, when the device is a mobile terminal device, a service can be provided based on the input position information. For example, to deliver a variety of information suitable for the current position and time of the user.
The communication control unit 110 generates information to be transmitted when the positioning device 100 discovers an access point, and analyzes a signal to be received from the discovered access point. For example, the information to be transmitted when discovering an access point includes a probe request when performing an active scan. The probe request may include an identifier of an access point to be discovered, or may include information for requesting a response from an access point located in the vicinity of the positioning device 100. Further, for example, a signal to be transmitted when discovering an access point may include a reassociation request in active scan and passive scan.
For example, a signal to be received from a discovered access point includes a probe response when performing an active scan. The probe response may include an identifier of an access point that transmits the probe response. Further, for example, a signal to be received from a discovered access point includes a beacon in passive scan. The beacon may include an identifier of an access point that transmits the beacon.
In addition, when performing an active scan, the communication control unit 110 controls the wireless unit 102 so that a probe request is transmitted for each channel. Moreover, when performing a passive scan, the communication control part 110 controls the radio | wireless part 102 so that a frequency band may be scanned so that a beacon signal can be detected for every channel.
The GPS positioning device 112 measures the position of the positioning device 100 according to a control signal (positioning command) to be input by the central processing unit 106. For example, the GPS positioning device 112 receives the radio waves from the plurality of GPS satellites 300 1 to 300 n by the self-supporting positioning method, and thereby the distance from the plurality of GPS satellites 300 1 to 300 n to the GPS positioning device 112. (Pseudo distance) is calculated. The GPS positioning device 112 performs positioning of the positioning device 100 on which the GPS positioning device 112 is mounted based on the pseudo distance. Signals emitted by the GPS satellites 300 1 -300 n is the distance between the GPS satellites 300 1 -300 n and GPS positioning device 112 radio waves reach the GPS positioning device 112 with a delay time to propagate. Therefore, if the time required for radio wave propagation is obtained for a plurality of GPS satellites 300 1 to 300 n , the position of the GPS positioning device 112 can be obtained by positioning calculation. For example, for the radio waves emitted by the plurality of GPS satellites 300 1 to 300 n, the distance from each GPS satellite 300 1 to 300 n to the GPS positioning device 112 is obtained in the distance measuring unit of the GPS positioning device 112. Then, the positioning calculation unit obtains the position of the GPS positioning device 112 based on the distance obtained by the ranging unit.
Further, the GPS positioning device 112 may perform positioning by the A-GPS method. In the A-GPS method, data required for the GPS positioning device 112 to perform positioning is distributed from a network (not shown). The said data, for example, and the like orbit information area information and GPS satellites 300 n of the base station. The area information of the base station includes approximate position information of the positioning device 100, information related to an error in the approximate position, and the like. The positioning result may be represented by longitude and latitude. Further, it may be expressed by altitude. The GPS positioning device 112 inputs position information to the CPU 106.
<Functions of this positioning device>
The processing executed by the positioning apparatus 100 includes processing for scanning a frequency band (hereinafter referred to as “frequency band scanning processing”) in order to find the access point 200 m . In the frequency band scanning process, the frequency band is measured. The frequency band scanning process includes a process for searching for a channel.
Further, the processing executed by the positioning device 100 includes processing for obtaining the distance to the access point found based on the result of the frequency band scanning process and obtaining the position of the positioning device 100. For example, the positioning device 100 obtains the position of the access point from the identifier of the access point. The positioning apparatus 100 may obtain the distance to the access point based on the position of the access point and the reception strength of the radio signal to be transmitted by the access point 200m. When the position of the access point 200m is necessary when obtaining the distance, the position of the access point 200m may be stored in advance in the positioning device 100, or may be obtained by another method. Also good. For example, you may acquire by the portable terminal device carrying the said positioning apparatus 100. FIG. For example, the mobile terminal device may obtain the access point by accessing a server that stores location information of the access point. The portable terminal device may perform wireless communication using a predetermined wireless communication method. For example, the wireless communication system may include GSM (registered trademark) (Global System for Mobile Communications), WCDMA (registered trademark) (Wideband Code Division Multiple Access), LTE (registered trademark) (Long Term Evolution). Good. Further, the location information of the access point may be acquired by WLAN.
Further, the processing executed by the positioning device 100 includes processing for determining whether or not the position obtained by WLAN positioning (hereinafter referred to as “WLAN positioning result”) is highly reliable. . For example, the positioning device 100 uses the base station area information to be acquired when the GPS positioning device 112 performs positioning by the A-GPS method, and whether the WLAN positioning result is highly reliable. You may make it determine whether. Further, for example, the positioning device 100 may determine whether the WLAN positioning result is highly reliable by using the positioning result (position history) by the GPS positioning device 112.
The processing executed by the positioning device 100 includes processing for determining whether the accuracy of the WLAN positioning result is highly reliable. For example, the positioning device 100 may determine whether the accuracy of the WLAN positioning position is high based on the positioning error (error radius) of the WLAN positioning result.
FIG. 3 is a functional block diagram illustrating functions of the positioning device 100. FIG. 3 mainly shows functions executed by the central processing unit 106.
When the positioning device 100 is mounted on a mobile terminal device, the mobile terminal device provides appropriate services and contents according to the location and environment of the user. The process of providing the appropriate service and content may be performed by software. The service is performed by combining location information and content information in real time with various types of geographic information. The geographical information is used by using mobile communication technology in various fields such as disaster prevention, security, and traffic. Use of the geographical information is called location-based service (LBS).
The social infrastructure and major technical issues necessary for the realization of LBS include high-precision 3D spatial data, seamless positioning systems that can acquire positions in a wide range of spaces including outdoors and indoors, communication systems, and terminal / display technologies. Etc. are included.
One example of a seamless positioning system is position positioning using a wireless LAN. The positioning device 100 performs position positioning using a wireless LAN. Further, the positioning device 100 performs GPS positioning. The GPS positioning may be A-GPS positioning. The positioning device 100 determines the reliability of the WLAN positioning result based on assist information to be acquired at the time of the A-GPS positioning. Determining the reliability may be referred to as filtering.
The GPS positioning may be self-supporting positioning, auto-GPS positioning, single-point positioning, or tracking. The positioning device 100 determines the reliability of the WLAN positioning result based on the positioning history by the GPS positioning. Determining the reliability may be referred to as filtering.
The positioning device 100 includes a positioning control unit 1062. The positioning control unit 1062 is connected to the GPS positioning device 112 and the communication control unit 110. The positioning control unit 1062 controls the GPS positioning device 112. The positioning control unit 1062 acquires the positioning result and inputs it to the reliability determination unit 1068 when the GPS positioning apparatus 112 performs positioning by the self-supporting positioning method. In addition, when the GPS positioning device 112 performs positioning by the A-GPS method, the positioning control unit 1062 acquires assist information that should be used when positioning by the A-GPS method. The positioning control unit 1062 inputs the assist information to the reliability determination unit 1068.
In addition, the positioning control unit 1062 controls the communication control unit 110. The positioning control unit 1062 acquires the access point identifier and the received signal strength of the access point from the communication control unit 110. The positioning control unit 1062 inputs the access point identifier and the received signal strength of the access point to the WLAN positioning calculation unit 1064.
The positioning device 100 includes a WLAN positioning calculation unit 1064. The WLAN positioning calculation unit 1064 is connected to the positioning control unit 1062. The WLAN positioning calculation unit 1064 identifies the position of the positioning device 100 based on the access point identifier input by the positioning control unit 1062 and the received signal strength of the access point. For example, the WLAN positioning calculation unit 1064 acquires the location information of the access point corresponding to the identifier of the access point. For example, the WLAN positioning calculation unit 1064 refers to a table in which an access point identifier stored in a local database (DB) 1066 is associated with the position of the access point, and is input by the positioning control unit 1062. The location information corresponding to the identifier of the access point obtained is acquired. The position is specified based on the position information and the received signal strength of the access point. The WLAN positioning calculation unit 1064 inputs the WLAN positioning result to the reliability determination unit 1068.
The positioning apparatus 100 has a local database 1066. The local database 1066 is connected to the WLAN positioning calculation unit 1064. The local database 1066 stores an identifier of an access point and a position of the access point in association with each other. Information in which the identifier of the access point is associated with the position of the access point may be acquired by accessing a server connected to the network by a mobile terminal device on which the positioning device 100 is mounted. When acquired by accessing the network, the local database 1066 is not necessarily required. The network includes the Internet. Further, the correspondence between the identifier of the access point and the position of the access point may be provided from the base station.
The positioning apparatus 100 includes a reliability determination unit 1068. The reliability determination unit 1068 is connected to the positioning control unit 1062 and the WLAN positioning calculation unit 1064. The reliability determination unit 1068 determines the reliability of the WLAN positioning result input by the WLAN positioning calculation unit 1064 based on the assist information input by the positioning control unit 1062 and / or the positioning result by the GPS positioning device 112.
<Reliability judgment method (1)>
The reliability determination unit 1068 determines the WLAN positioning result based on the area information of the base station included in the assist information input by the positioning control unit 1062. When determining the WLAN positioning result based on the area information of the base station, the positioning procedure by the A-GPS method and the positioning procedure of the WLAN positioning may be started in parallel. In the positioning procedure using the A-GPS method, it is only necessary to perform processing for obtaining assist data, and it is not necessary to perform positioning using the assist data.
The reliability determination unit 1068 obtains an area where the positioning device 100 is assumed to be located based on the area information of the base station. For example, the position of the base station included in the area information of the base station is acquired, the position of the base station is regarded as the position of the positioning device 100 (hereinafter referred to as “approximate position”) (replacement), and the approximate position is the center. Draw a circle. The approximate position may be indicated by longitude and latitude. The radius of the circle (hereinafter referred to as “error radius”) may be set based on information regarding the error in the position of the base station. For example, it may be a range of errors expected by regarding the position of the base station as the position of the positioning device 100. In addition, information on the error radius may be included in the information on the position error of the base station. For example, the error radius may be the radius of the base station area.
The reliability determination unit 1068 determines the reliability of the WLAN positioning result by comparing the WLAN positioning result with the approximate position. For example, when the distance between the approximate position and the WLAN positioning result is equal to or less than the error radius, it is determined that the reliability of the WLAN positioning result is high. On the other hand, if the distance between the approximate position and the WLAN positioning result exceeds the error radius, it is determined that the reliability of the WLAN positioning result is low.
FIG. 4 is a diagram (part 1) for explaining the process of the reliability determination unit 1068.
FIG. 4 shows a position indicating the WLAN positioning result and a circle whose center is the approximate position and whose radius is the error radius. In the example shown in FIG. 4, the WLAN positioning result exists in the circle. In the example shown in FIG. 4, since the distance between the approximate position and the WLAN positioning result is equal to or less than the error radius, it is determined that the reliability of the WLAN positioning result is high. When the reliability of the WLAN positioning result is high, the WLAN positioning result is adopted.
FIG. 5 is a diagram (part 2) for explaining the process of the reliability determination unit 1068.
FIG. 5 shows a position indicating the WLAN positioning result and a circle whose center is the approximate position and whose radius is the error radius. In the example shown in FIG. 4, there is no WLAN positioning result in the circle. In the example shown in FIG. 5, since the distance between the approximate position and the WLAN positioning result exceeds the error radius, it is determined that the reliability of the WLAN positioning result is low. When the reliability of the WLAN positioning result is low, the WLAN positioning result is not adopted.
<Reliability judgment method (2)>
The reliability determination unit 1068 determines the WLAN positioning result based on the GPS positioning result (positioning position) input by the positioning control unit 1062. When the WLAN positioning result is determined based on the GPS positioning result, the positioning position history is accumulated. The positioning position history may include those obtained by the self-supporting positioning method, may include those obtained by the auto GPS function, and may include those obtained by single-shot positioning. It may also be included that acquired by the tracking function. Auto-GPS is a function of notifying a service provider of user location information at predetermined time intervals. In auto GPS, position information is acquired at predetermined time intervals. Moreover, the positional information acquired by the autonomous system may be included. In the autonomous system, positioning calculation is performed by the positioning device 100 alone. No communication occurs during the positioning.
The reliability determination unit 1068 compares the latest positioning position (hereinafter referred to as “Last Position”) of the GPS positioning results included in the positioning position history with the WLAN positioning result. For example, based on the last position, an area where the positioning device 100 is assumed to be located is obtained. For example, a circle centered on the last position is drawn. The last position may be indicated by longitude and latitude. The radius of the circle (hereinafter referred to as “position σ”) is expressed as “elapsed time” from the time when the last position was measured, “estimated speed” of the positioning device 100, and “last position error radius”. It may be set based on this. For example, you may set by Formula (1).
Position σ = Elapsed time x Estimated speed + Last position error radius (1)
The elapsed time may be set based on a time stamp corresponding to the last position. The time stamp may be included in the positioning history. Moreover, the time in the apparatus in which the positioning device 100 is mounted when the WLAN positioning is completed may be used. Moreover, the time counted by the system timer mounted on the device on which the positioning device 100 is mounted may be used as the elapsed time.
<Estimated speed>
The estimated speed may be set for each moving means when the positioning device 100 is moving. For example, the estimated speed may be set by the following method.
1) Select from two parameters For example, the two parameters include high-speed movement and low-speed movement. For example, when it is determined that the vehicle is moving at a high speed, a moving speed to be set when the vehicle is moving at a high speed is selected. For example, a moving speed such as 80 km / h may be set. For example, it may be detected that the serving base station is switched and whether or not the base station is moving at high speed based on the number of times of detection. For example, in a case where the positioning device 100 is mounted on a mobile terminal device, the state determination unit 1072 moves at high speed based on the number of times that the serving base station to be input by the serving base station information acquisition unit 1074 is switched. It may be determined whether or not. Information on the serving base station is input to the state determination unit 1072. The state determination unit 1072 inputs information indicating whether or not it is moving at high speed to the reliability determination unit 1068. You may make it determine whether it is moving at high speed based on the frequency | count of switching in predetermined time.
For example, when it is determined that the vehicle is moving at a low speed, a moving speed to be set when the vehicle is moving at a low speed is selected. For example, a moving speed such as 5 km / h may be set. For example, it may be determined whether the vehicle is moving at a low speed based on the detection result by the sensor. Specifically, it may be determined whether or not the vehicle is moving at a low speed based on the value of the step count to be detected by an acceleration sensor or the like. Specifically, the value of the step count is input from the walking detection unit 1076 to the state determination unit 1072. The state determination unit 1072 determines whether or not the vehicle is moving at a low speed based on the step count value input by the walking detection unit 1076.
2) Select from a plurality of parameters For example, the plurality of parameters include a moving speed. For example, when it is determined that the vehicle is moving by a high-speed railway, a moving speed to be set when moving by the high-speed railway is selected. For example, a moving speed such as 270 km / h may be set. The high-speed rail includes the Shinkansen. For example, it may be determined whether or not the vehicle is moving by a high-speed rail based on the detection result by the sensor. Specifically, it may be determined whether the vehicle is moving by a high-speed rail based on a state detected by an acceleration sensor or the like.
For example, when it is determined that the vehicle is moving by a train, a moving speed to be set when the vehicle is moving by the train is selected. For example, a moving speed such as 130 km / h may be set. For example, based on the detection result by the sensor, it may be determined whether the vehicle is moving by train. Specifically, it may be determined whether or not the vehicle is moving by a train based on a state detected by an acceleration sensor or the like.
Also, for example, when it is determined that the vehicle is moving, a moving speed to be set when it is determined that the vehicle is moving is selected. For example, a moving speed such as 80 km / h may be set. For example, it may be determined whether or not the vehicle is moving based on the detection result of the sensor. Specifically, it may be determined whether the vehicle is moving based on a state detected by an acceleration sensor or the like.
Further, for example, when it is determined that the vehicle is traveling, a traveling speed to be set when it is determined that the vehicle is traveling is selected. For example, a traveling speed such as 20 km / h may be set. For example, it may be determined whether or not the vehicle is traveling based on the detection result of the sensor. Specifically, it may be determined whether the vehicle is traveling based on a state detected by an acceleration sensor or the like.
For example, when it is determined that the user is walking, the walking speed to be set when the user is determined to be walking is selected. For example, a walking speed such as 5 km / h may be set. For example, you may determine whether you are walking based on the detection result by a sensor. Specifically, it may be determined whether the user is walking based on a state detected by an acceleration sensor or the like.
Specifically, acceleration information is input from the movement state detection unit 1078 to the state determination unit 1072. The state determination unit 1072 determines the movement state of the positioning device 100 based on the acceleration information input by the movement state detection unit 1078.
3) Estimating speed For example, the moving speed may be estimated, and the estimated speed may be set. For example, it may be detected that the serving base station information is switched, and the moving speed may be estimated based on the number of times of detection. You may estimate a moving speed based on the frequency | count of switching in predetermined time. For example, in the case where the positioning device 100 is mounted on a mobile terminal device, the state determination unit 1072 determines the moving speed based on the number of times that the serving base station to be input by the serving base station information acquisition unit 1074 is switched. May be estimated. Information on the serving base station is input to the state determination unit 1072. The state determination unit 1072 inputs the moving speed to the reliability determination unit 1068.
Further, for example, the moving speed may be estimated based on the detection result by the sensor. Specifically, the moving speed may be estimated based on a state detected by an acceleration sensor or the like. Specifically, acceleration information is input from the movement state detection unit 1078 to the state determination unit 1072. The state determination unit 1072 determines the movement state of the positioning device 100 based on the acceleration information input by the movement state detection unit 1078.
The reliability determination unit 1068 determines the reliability of the WLAN positioning result by comparing the WLAN positioning result with the last position. For example, when the distance between the last position and the WLAN positioning result is equal to or less than the position σ, it is determined that the reliability of the WLAN positioning result is high. On the other hand, when the distance between the last position and the WLAN positioning result exceeds the position σ, it is determined that the reliability of the WLAN positioning result is low.
FIG. 6 is a diagram (part 3) for explaining the process of the reliability determination unit 1068.
FIG. 6 shows a position indicating the WLAN positioning result and a circle centered on the last position and having a radius of position σ. In the example shown in FIG. 6, the WLAN positioning result exists in the circle. In the example shown in FIG. 6, since the distance between the last position and the WLAN positioning result is equal to or less than the position σ, it is determined that the reliability of the WLAN positioning result is high. When the reliability of the WLAN positioning result is high, the WLAN positioning result is adopted.
FIG. 7 is a diagram (No. 4) for explaining the process of the reliability determination unit 1068.
FIG. 7 shows a position indicating the WLAN positioning result and a circle centered on the last position and having a radius of position σ. In the example shown in FIG. 7, there is no WLAN positioning result in the circle. In the example shown in FIG. 7, since the distance between the last position and the WLAN positioning result exceeds the position σ, it is determined that the reliability of the WLAN positioning result is low. When the reliability of the WLAN positioning result is low, the WLAN positioning result is not adopted.
In addition, the reliability determination unit 1068 determines the reliability of the accuracy of the WLAN positioning position. For example, the reliability determination unit 1068 determines whether the positioning error of the WLAN positioning result is less than the error radius of the approximate position based on the positioning error of the WLAN positioning result. When the positioning error of the WLAN positioning result is less than the error radius of the approximate position, it may be determined that the accuracy of the WLAN positioning position is high, in other words, the reliability of the WLAN positioning result is high. On the contrary, when the positioning error of the WLAN positioning result is equal to or larger than the error radius of the approximate position, it may be determined that the accuracy of the WLAN positioning position is low, in other words, the reliability of the WLAN positioning result is low. Furthermore, when the positioning error of the WLAN positioning result is less than a predetermined threshold (threshold B), it may be determined that the accuracy of the WLAN positioning position is high, in other words, the reliability of the WLAN positioning result is high. Conversely, when the positioning error of the WLAN positioning result is equal to or greater than a predetermined threshold (threshold B), it may be determined that the accuracy of the WLAN positioning position is low, in other words, the reliability of the WLAN positioning result is low. .
When the reliability determination unit 1068 determines that the reliability of the WLAN positioning result is high, the reliability determination unit 1068 inputs the WLAN positioning result to the positioning result notification control unit 1070. In addition, when it is determined that the reliability of the WLAN positioning result is high and the positioning accuracy is high, the WLAN positioning result may be input to the positioning result notification control unit 1070.
Further, when the reliability determination unit 1068 determines that the reliability of the WLAN positioning result is low, the reliability determination unit 1068 acquires the GPS positioning result from the positioning control unit 1062. The reliability determination unit 1068 inputs the GPS positioning result to the positioning result notification control unit 1070. Further, the reliability determination unit 1068 may input the approximate position to the positioning result notification control unit 1070.
The positioning device 100 includes a positioning result notification control unit 1070. The positioning result notification control unit 1070 is connected to the reliability determination unit 1068 and the local database 1066. The positioning result notification control unit 1070 performs control to notify the network of at least one of the WLAN positioning result, the GPS positioning result, and the approximate position to be input by the reliability determination unit 1068. In addition, when it is determined that the reliability of the WLAN positioning result is low, the GPS positioning result and the approximate position are fed back. The feedback destination may be the local database 1066 or a server having a database in which the location of the WLAN access point is registered. The server may exist in the network. Further, the location information of the WLAN access point may exist in the base station.
The positioning apparatus 100 includes a state determination unit 1072. The state determination unit 1072 determines the movement state of the user carrying the device on which the positioning device 100 is mounted. The device may be a mobile terminal device. For example, the state base unit information is input to the state determination unit 1072 from the base station information acquisition unit 1074. In addition, the step count value is input to the state determination unit 1072 from the walking detection unit 1076. In addition, information for determining the movement state is input from the movement state detection unit 1078 to the state determination unit 1072. The information for determining the movement state includes acceleration.
The state determination unit 1072 determines whether or not the positioning device 100 is moving at high speed based on the base station information from the base station information acquisition unit 1074. The state determination unit 1072 determines whether or not the positioning device 100 is walking based on the step count value from the walking detection unit 1076. Information for determining the movement state is input to the state determination unit 1072 from the movement state detection unit 1078. Based on the information for determining the moving state, the moving speed of the positioning device 100 is estimated. The state determination unit 1072 gives the reliability determination unit 1068 the determination result of whether or not the positioning device 100 is moving at high speed, the determination result of whether or not the positioning device 100 is walking, and the moving speed of the positioning device 100. input. Information indicating the moving means determined based on the moving speed may be input.
The device on which the positioning device 100 is mounted has a serving base station information acquisition unit 1074. The device may be a mobile terminal device. The positioning device 100 may include a serving base station information acquisition unit 1074. The located base station information acquisition unit 1074 obtains information on the base station device where the mobile terminal device is located. For example, the serving base station information acquisition unit 1074 may acquire the serving base station information when the mobile terminal device is handed over and the serving base station device is changed. In addition, the serving base station information acquisition unit 1074 may acquire at a predetermined cycle set in advance. The visited base station information acquisition unit 1074 inputs the visited base station information to the state determination unit 1072. When the location base station information is input to the state determination unit 1074, if the location base station information is set to be acquired at a predetermined cycle, the acquired location base station is changed. The base station information may be notified (when different from the previous base station).
The device on which the positioning device 100 is mounted has a walking detection unit 1076. The device may be a mobile terminal device. The portable terminal device has a walking detection unit 1076. The positioning device 100 may include a walking detection unit 1076. The walking detection unit 1076 determines whether or not the user carrying the portable terminal device is walking. For example, acceleration information and / or step count information is set. The walking detection unit 1076 determines whether the user is walking based on the acceleration information and / or the number of steps information. For example, the walking detection unit 1076 counts the number of steps, and estimates the acceleration based on the count value. The walking detection unit 1076 may determine that the user is walking when the estimated value of the acceleration is less than a threshold value included in the acceleration information. The threshold value included in the acceleration information may be set to a value representing a low acceleration state. The value representing the threshold value included in the low acceleration state may be an acceleration when walking. Also. It may be determined that the user is walking when the low acceleration state continues for a predetermined time. Further, when it is determined that the moving distance has reached a predetermined distance based on the step count information, it may be determined that the user is walking. When it is determined that the user is walking, the walking detection unit 1076 inputs the walking count value to the state determination unit 1072. If it is not determined that the user is walking, the walking detection unit 1076 may not input anything. In addition, when it is not determined that the user is walking, the walking detection unit 1076 may input information indicating that the user is not walking to the state determination unit 1072.
The device on which the positioning device 100 is mounted has a movement state detection unit 1078. The device may be a mobile terminal device. The portable terminal device has a movement state detection unit 1078. The positioning device 100 may include a movement state detection unit 1078. The movement state detection unit 1078 determines the movement state of the user carrying the portable terminal device. The movement state detection unit 1078 detects acceleration. The movement state detection unit 1078 inputs acceleration information to the state determination unit 1072. In the state determination unit 1072, for example, acceleration information for determining the moving means is set. The state determination unit 1072 determines the moving state of the user based on the acceleration information for determining the moving means. When the state determination unit 1072 determines that the user is moving by moving means such as a high-speed railroad, train, car, etc., information indicating the moving means is input to the reliability determination unit 1068. The state determination unit 1072 inputs nothing when it is not determined that the user is moving by the moving means. In addition, when it is not determined that the user is moving by the moving unit, the state determining unit 1072 may input information indicating that the user is not moving by the moving unit to the reliability determining unit 1068.
The mobile terminal device on which the positioning device 100 is mounted may have a plurality of CPUs. For example, among the functions shown in FIG. 3, the positioning control unit 1062, the WLAN positioning calculation unit 1064, the reliability determination unit 1068, the positioning result notification control unit 1070, and the state determination unit 1072 include an application CPU (A-CPU: Application CPU). The A-CPU is a CPU for application system control, and controls various application functions and user interfaces, for example. Further, the processing of the serving base station information acquisition unit 1074 may be executed by a communication CPU (C-CPU). The C-CPU is a CPU for transmission system control, and controls communication operations such as connection and disconnection between base stations and exchanges, for example.
<Operation of this system>
FIG. 8 is a flowchart showing the operation of this system. FIG. 8 shows an example in which the positioning device 100 is mounted on a mobile terminal device.
The mobile terminal device starts positioning (step S802).
A communication session is established between the mobile terminal device and the network (step S804).
The mobile terminal device performs WLAN positioning (step S806). For example, the positioning control unit 1062 acquires the identifier of the access point and the received electric field strength of the identifier from the communication control unit 110. The WLAN positioning calculation unit 1064 obtains the position of the access point based on the identifier of the access point input by the positioning control unit 1062, and obtains the WLAN positioning position of the positioning device 100 based on the position and the received electric field strength. .
The mobile terminal device requests assist data (assist information) from the network (step S808). For example, the positioning control unit 1062 requests assist data from the C-CPU. The C-CPU requests assist data via the base station in response to a request from the positioning control unit 1062. Further, for example, the positioning control unit 1062 may request assist data from the GPS positioning device 112. The GPS positioning device 112 requests assist data from the communication control unit 110. The communication control unit 110 requests assist data via the wireless unit 102.
The network notifies the assist data to the mobile terminal device (step S810). The assist data is input from the C-CPU to the positioning control unit 1062. Further, the assist data may be input from the GPS positioning device 112 to the positioning control unit 1062. The positioning control unit 1062 inputs the assist data to the reliability determination unit 1068.
The mobile terminal device determines whether the reliability of the WLAN positioning result is high (step S812). For example, the reliability determination unit 1068 determines whether the reliability of the WLAN positioning result input by the WLAN positioning calculation unit 1064 is high based on the assist data input by the positioning control unit 1062. For example, the distance between the WLAN positioning result and the approximate position is obtained, and it is determined whether the distance is less than the error radius of the approximate position.
When it is determined that the reliability of the WLAN positioning result is high (step S812: YES), the mobile terminal device determines whether the accuracy of the WLAN positioning is high (step S814). For example, the reliability determination unit 1068 determines whether the error radius of the WLAN positioning result is less than the error radius of the approximate position.
If it is determined in step S812 that the reliability of WLAN positioning is low (step S812: NO), or if it is determined in step S814 that the accuracy of WLAN positioning is low (step S814: NO), GPS positioning is performed. (Step S816). For example, if the reliability determination unit 1068 determines that the reliability of the WLAN positioning result is low, or determines that the accuracy of the WLAN positioning is low, the reliability determination unit 1068 requests the positioning control unit 1062 to perform GPS positioning. The positioning control unit 1062 requests the GPS positioning device 112 to perform GPS positioning in accordance with the request from the reliability determination unit 1068. The GPS positioning may be performed based on the assist data notified in step S810.
When it is determined in step S814 that the reliability of the WLAN positioning result is high, or after GPS positioning is performed in step S816, the mobile terminal device notifies the network of the positioning result (step S818). For example, when the reliability determination unit 1068 determines that the reliability of the WLAN positioning result is high, the positioning result notification control unit 1070 performs control to notify the network of the WLAN positioning result. In addition, the positioning control unit 1062 may notify the network of the GPS positioning result when it is determined that the reliability of the WLAN positioning result is low. In addition, the positioning result notification control unit 1070 may determine that the reliability of the WLAN positioning result is low, but may notify the network of the approximate position when the GPS positioning result cannot be obtained.
The mobile terminal device feeds back the GPS positioning result or the approximate position to the local database 1066 (step S820). For example, the positioning result notification control unit 1070 feeds back the GPS positioning result or the approximate position to the local database 1066. The positioning result notification control unit 1070 may feed back the GPS positioning result or the approximate position to a server having a database in which the installation position of the WLAN access point is registered. The database can be updated by feeding back the GPS positioning result or approximate position.
A communication session between the mobile terminal device and the network is released (step S822).
The positioning in the portable terminal device is finished (step S824).
In the flowchart shown in FIG. 8, the reliability of the WLAN positioning result may be checked without performing steps S808 and S810. In the reliability check, the reliability of the WLAN positioning is checked by comparing the last position and the WLAN positioning result based on the history of the GPS positioning position.
When it is determined that the reliability of the WLAN positioning result is high, the WLAN positioning result is notified to the network. Further, when it is determined that the reliability of the WLAN positioning result is low, the last position may be notified to the network. When the last position is notified to the network, the last position may be fed back to the DB.
<Operation of this positioning device>
FIG. 9 is a flowchart showing the operation of the positioning device.
The positioning device 100 starts A-GPS positioning (step S902). For example, the GPS positioning device 112 starts A-GPS positioning. For example, the GPS positioning device 112 performs A-GPS positioning according to control by the positioning control unit 1062.
The positioning device 100 acquires the approximate position from the network by the A-GPS processing procedure (step S904). For example, the positioning control unit 1062 acquires the approximate position. The approximate position may be included in the assist information. For example, the base station position is obtained from the base station area information included in the assist information, and the base station position is set as the approximate position of the positioning device 100.
On the other hand, the positioning device 100 starts WLAN positioning (step S906). For example, the WLAN positioning calculation unit 1064 starts WLAN positioning.
The positioning apparatus 100 determines whether the WLAN positioning has been successful (step S908). For example, the WLAN positioning calculation unit 1064 determines whether the WLAN positioning is successful.
When it is determined that the WLAN positioning is successful (step S908: YES), the positioning device 100 determines whether the reliability of the WLAN positioning result is high (step S910). For example, the reliability determination unit 1068 determines whether the distance between the WLAN positioning result and the approximate position is equal to or less than the error radius of the approximate position.
When it is not determined that the WLAN positioning is successful (step S908: NO), and when it is determined that the distance between the WLAN positioning result and the approximate position is larger than the error radius of the approximate position (step S910: NO), the main positioning The apparatus 100 performs the A-GPS positioning procedure without using the WLAN positioning result (step S912). When the A-GPS positioning procedure is performed, the finally obtained position information is fed back together with access point information (API: Access Point Information) located around the positioning device 100. The position information includes a GPS positioning result and / or approximate position obtained by the A-GPS positioning procedure. The access point information includes the MAC (MAC: Media Access Control) address of the access point and the received signal strength of the access point. The feedback destination may be the local database 1066 or a server having a database in which the location of the WLAN access point is registered. Moreover, the base station in which the installation position of the WLAN access point is registered may be used.
When it is determined that the distance between the WLAN positioning result and the approximate position is equal to or less than the error radius of the approximate position (step S910: YES), the positioning device 100 determines that the error radius of the approximate position is less than the error radius of the WLAN positioning result. It is determined whether or not there is (step S914). For example, the reliability determination unit 1068 determines whether the error radius of the approximate position is less than the error radius of the WLAN positioning result. This is because even if the distance between the WLAN positioning result and the approximate position is determined to be equal to or less than the error radius, if the accuracy of the WLAN positioning result is low, the reliability is low and the WLAN positioning result should not be adopted. . In this embodiment, when the error radius of the WLAN positioning result is larger than the error radius of the approximate position, it is determined that the accuracy of the WLAN positioning result is low. In other words, when the error radius of the WLAN positioning result is larger than the error radius of the approximate position, it is determined that the accuracy of the error radius of the approximate position is high.
If the error radius of the approximate position is less than the error radius of WLAN positioning (step S914: YES), the positioning device 100 determines whether the error radius of the approximate position is less than the threshold A. For example, the reliability determination unit 1068 determines whether the error radius of the approximate position is less than the threshold value A. Even if it is determined that the error radius of the approximate position is less than the error radius of the WLAN positioning, if the error radius of the approximate position is large, the accuracy of the error radius of the approximate position is low, so the approximate position should be adopted Because it is not. The threshold value A is set based on a range that can be tolerated when specifying the position. Moreover, you may set according to the precision requested | required with respect to a position.
When it is determined that the error radius of the approximate position is less than the threshold value A (step S916: YES), the positioning device 100 sets the approximate position as the final positioning result (step S918). For example, when the reliability determining unit 1068 determines that the error radius of the approximate position is less than the threshold A, the accuracy of the error radius of the approximate position is high, and thus the approximate position is set as the final positioning result.
On the other hand, when it is not determined that the error radius of the approximate position is smaller than the threshold A (step S916: NO), in other words, when it is determined that the error radius of the approximate position is greater than or equal to the threshold A, the positioning device 100 is GPS. Positioning is executed (step S920). For example, if the reliability determination unit 1068 determines that the error radius of the approximate position is greater than or equal to the threshold value A, the reliability determination unit 1068 determines that the accuracy of the error radius of the approximate position is low, and performs A-GPS positioning on the positioning control unit 1062. Order to do. The positioning control unit 1062 instructs the GPS positioning device 112 to execute A-GPS positioning according to the command from the reliability determination unit 1068. The A-GPS positioning result is input from the GPS positioning device 112 to the reliability determination unit 1068 via the positioning control unit 1062.
The positioning apparatus 100 determines whether the error radius of the WLAN positioning result is less than the error radius of A-GPS positioning (step S922). For example, the reliability determination unit 1068 determines whether the error radius of the WLAN positioning result is less than the error radius of A-GPS positioning. This is because it is preferable to employ a positioning result having a small error radius. The determination may be made using the error radius of the approximate position instead of the error radius of the WLAN positioning result.
When it is determined that the error radius of WLAN positioning is less than the error radius of A-GPS positioning (step S922: YES), the positioning device 100 sets the approximate position as the final positioning result (step S918). For example, if the reliability determination unit 1068 determines that the error radius of WLAN positioning is less than the error radius of A-GPS positioning, the approximate position is set as the final positioning result. The positioning result notification control unit 1070 notifies the approximate position to the network. The positioning control unit 1062 may end the A-GPS positioning procedure.
On the other hand, when it is not determined that the error radius of WLAN positioning is less than the error radius of A-GPS positioning (step S922: NO), in other words, it is determined that the error radius of WLAN positioning is greater than or equal to the error radius of A-GPS positioning. In this case, the positioning device 100 sets the A-GPS positioning result as the final positioning result (step S924). For example, if the reliability determination unit 1068 determines that the error radius of WLAN positioning is greater than or equal to the error radius of A-GPS positioning, the reliability determination unit 1068 sets the A-GPS positioning result as the final positioning result. This is because the accuracy of A-GPS positioning results is higher. The positioning result notification control unit 1070 notifies the network of the A-GPS positioning result. The positioning control unit 1062 may end the positioning procedure.
In step S914, if the error radius of the approximate position is not less than the error radius of the WLAN positioning result, in other words, if the error radius of the approximate position is greater than or equal to the error radius of the WLAN positioning result (step S914: NO), this positioning device 100 determines that the accuracy of the WLAN positioning result is high, and determines whether the error radius of the WLAN positioning result is less than the threshold value B. For example, the reliability determination unit 1068 determines whether the error radius of the WLAN positioning result is less than the threshold value B. This is because even if it is determined that the error radius of the approximate position is greater than or equal to the error radius of the WLAN positioning result, if the error radius of the WLAN positioning result is large, acceptable accuracy cannot be obtained. The threshold value B is set based on a range that can be tolerated when specifying the position. Moreover, you may set according to the precision requested | required with respect to a position.
When it is determined that the error radius of the WLAN positioning result is less than the threshold value B (step S926: YES), the positioning device 100 determines that the accuracy of the WLAN positioning result is high, and uses the WLAN positioning result as the final positioning result. (Step S928). For example, when the reliability determination unit 1068 determines that the error radius of the WLAN positioning result is less than the threshold value B, the reliability determination unit 1068 sets the WLAN positioning result as the final positioning result. The positioning result notification control unit 1070 notifies the WLAN positioning result to the network. The positioning control unit 1062 may end the A-GPS positioning procedure.
On the other hand, when it is not determined that the error radius of the WLAN positioning result is less than the threshold B (step S926: NO), in other words, when it is determined that the error radius of the WLAN positioning result is greater than or equal to the threshold B, the positioning device 100 Performs GPS positioning (step S930). For example, if the reliability determination unit 1068 determines that the error radius of the WLAN positioning result is greater than or equal to the threshold value B, the reliability determination unit 1068 instructs the positioning control unit 1062 to perform A-GPS positioning. The positioning control unit 1062 instructs the GPS positioning device 112 to execute A-GPS positioning according to the command from the reliability determination unit 1068. The A-GPS positioning result is input from the GPS positioning device 112 to the reliability determination unit 1068 via the positioning control unit 1062.
The positioning apparatus 100 determines whether the error radius of the WLAN positioning result is less than the error radius of the A-GPS positioning (step S932). For example, the reliability determination unit 1068 determines whether the error radius of the WLAN positioning result is less than the error radius of A-GPS positioning. This is because it is preferable to employ a positioning result having a small error radius.
When it is determined that the error radius of WLAN positioning is less than the error radius of A-GPS positioning (step S932: YES), the positioning device 100 determines that the accuracy of the WLAN positioning result is high, and finalizes the WLAN positioning result. The positioning result is determined (step S928). For example, when the reliability determination unit 1068 determines that the error radius of the WLAN positioning result is smaller than the error radius of the A-GPS positioning, the reliability determination unit 1068 sets the WLAN positioning result as the final positioning result.
On the other hand, when it is not determined that the error radius of the WLAN positioning result is less than the error radius of the A-GPS positioning (step S932: NO), in other words, the error radius of the WLAN positioning result is greater than or equal to the error radius of the A-GPS positioning. If it is determined, the positioning apparatus 100 determines that the accuracy of the A-GPS positioning result is high, and sets the A-GPS positioning result as the final positioning result (step S934). For example, if the reliability determination unit 1068 determines that the error radius of WLAN positioning is greater than or equal to the error radius of A-GPS positioning, the reliability determination unit 1068 sets the A-GPS positioning result as the final positioning result. This is because the accuracy of A-GPS positioning results is higher. The positioning result notification control unit 1070 notifies the network of the A-GPS positioning result. The positioning control unit 1062 may end the positioning procedure.
In the flowchart shown in FIG. 9, the reliability of the WLAN positioning result in step S910 may be checked without performing steps S902 and S904. In the reliability check, the reliability of the WLAN positioning is checked by comparing the last position and the WLAN positioning result based on the history of the GPS positioning position.
Moreover, the process of step S922 may be performed without performing step S920. In step S922, the error radius of the WLAN positioning result may be compared with the error radius of the last position.
Moreover, the process of step S932 may be performed without performing step S930. In step S932, the error radius of the WLAN positioning result may be compared with the error radius of the last position.
In this embodiment, instead of the GPS positioning method, a European Galileo system, a Russian GLONASS system, or another satellite positioning system (SPS) may be applied. In other words, satellite navigation (GNSS: Global Navigation Satellite System) may be applied.
According to the present embodiment, whether or not the positioning result obtained by WLAN positioning is one of the problems to be solved when commercializing the WLAN positioning with the GPS positioning method is reliable. Can be judged automatically. Further, it is possible to automatically determine whether the accuracy of the positioning result obtained by the WLAN positioning is high, in other words, whether the accuracy of the positioning result is high.
Specifically, filtering is performed based on the error radius associated with the latitude and longitude information of “A-GPS positioning result” and “rough position (base station positioning result)” used in the location information service. By this filtering, it can be ensured that the reliability of the position information that the user can acquire is not degraded as compared with the conventional case.
According to the present embodiment, WLAN positioning can be included in the positioning method while ensuring serviceability. Since WLAN positioning can be included, a highly accurate and power saving positioning system can be realized.
In this embodiment, when the WLAN positioning is performed alone, it may not be used if the value acquired from the database is incorrect.
Further, it can be determined that the WLAN positioning result is reliable, and GPS positioning may be omitted when the WLAN positioning result is highly accurate. Whether it is highly accurate may be determined by an error radius. Power consumption can be reduced by omitting GPS positioning.
In addition, when it is determined that the reliability of the WLAN positioning result calculated based on information from the database (DB) is low, more accurate position information may be fed back to the database. . The database can be updated by feedback.
According to the present embodiment, a positioning device that measures a position is provided.
A satellite positioning unit as a GPS positioning device that performs positioning based on radio waves from positioning satellites,
Based on the position information to be acquired at the time of positioning by the satellite positioning unit or the positioning position by the satellite positioning unit, the positioning result by the WLAN positioning calculation unit exists within a predetermined range from the position information or the positioning position. A positioning result determination unit for determining whether or not
A positioning result adoption determining unit as a reliability determining unit that determines whether or not to adopt the positioning result based on a result determined by the positioning result determining unit.
Whether the WLAN positioning result is a reliable result can be determined. Since it is possible to determine whether the WLAN positioning result is reliable without frequently scanning the WLAN access point, power consumption can be reduced. Moreover, it can be determined whether the WLAN positioning result is a reliable result regardless of whether the database is updated. Since WLAN positioning can be added in addition to GPS positioning, a highly accurate and power-saving positioning system can be realized while ensuring serviceability.
A measurement accuracy determination unit as a reliability determination unit that determines whether the measurement accuracy of the positioning result is permissible based on the positioning error of the positioning result by the WLAN positioning calculation unit;
The measurement accuracy of the positioning result by the WLAN positioning calculation unit can be determined.
The measurement result determination unit determines reliability of the positioning result by determining whether a distance between the position information and the positioning result by the WLAN positioning calculation unit is equal to or less than a first threshold value. .
The first threshold is set based on an error in the position information.
Based on the position of the base station and the WLAN positioning result, the reliability of the WLAN positioning result can be determined.
It has a state determination unit that determines the movement state of the positioning device,
The positioning result determination unit determines the reliability of the positioning result by the WLAN positioning calculation unit based on the positioning position history and the movement state determined by the state determination unit.
The reliability of the WLAN positioning result can be determined based on the positioning position history by GPS positioning and the movement state of the positioning device.
Prior Symbol positioning result determining unit, among the history of the measured position, to determine whether the latest measured position, the distance between the positioning result by the WLAN positioning calculation unit is less than or equal to a second threshold To determine the reliability of the positioning result.
The second threshold is set based on an elapsed time after the latest positioning position is measured and a movement state of the positioning device determined by the state determination unit.
Based on the latest positioning position and the WLAN positioning result, the reliability of the WLAN positioning result can be determined.
The WLAN positioning calculation unit detects the position of the access point from a database in which the identifier of the access point is associated with the position of the access point, and performs positioning based on the position and the received signal strength of the radio wave. Do.
A satellite positioning position acquisition unit that acquires a positioning position to be measured by the satellite positioning unit when it is determined that the positioning result is not adopted by the positioning result determination unit;
A positioning result notifying unit for notifying a network of a positioning position acquired by the satellite positioning position acquiring unit or a positioning result by the WLAN positioning calculating unit;
When it is determined that the reliability of the WLAN positioning result is low, the GPS positioning result and / or the area information of the base station can be fed back to the database, so that the reliability of the database can be improved.
According to the present embodiment, a method in a positioning device for measuring a position is provided.
Based on the position information to be acquired at the time of positioning by the satellite positioning step or the positioning position by the satellite positioning step, the positioning result by the WLAN positioning calculation step exists within the predetermined range from the position information or positioning position. A measurement result determination step for determining whether or not
A positioning result adoption determining step for determining whether or not to adopt the positioning result based on the result determined by the measurement result determining step.
Although the present invention has been described above with reference to specific embodiments, each embodiment is merely an example, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. For convenience of explanation, an apparatus according to an embodiment of the present invention has been described using a functional block diagram, but such an apparatus may be realized by hardware, software, or a combination thereof. The present invention is not limited to the above-described embodiments, and various variations, modifications, alternatives, substitutions, and the like are included without departing from the spirit of the present invention.
DESCRIPTION OF SYMBOLS 100 Positioning apparatus 102 Radio | wireless part 104 Memory | storage part 106 Central processing unit (CPU: Central Processing Unit)
1062 Positioning control unit 1064 WLAN positioning calculation unit 1066 Local database
1068 Reliability determination unit 1070 Positioning result notification control unit 1072 State determination unit 1074 Current base station information acquisition unit 1076 Walking detection unit 1078 Movement state detection unit 108 Output unit 110 Communication control unit 112 GPS positioning device 200 1 -200 m (m Is an integer of m> 0) Access point 300 1 -300 n (n is an integer of n> 3) GPS satellite
Wherein the location information, A-GPS based positioning information contained Ru positioning apparatus based on the base station area information acquired when the positioning is carried out by.
The positioning device according to claim 1 ,
A positioning apparatus comprising: a measurement accuracy determination unit that determines whether the measurement accuracy of the positioning result is allowed based on a positioning error of the positioning result by the WLAN positioning calculation unit.
The positioning device according to claim 1 or 2 ,
The positioning result determining unit, the distance between the positioning result by the position information and the previous SL WLAN positioning calculation unit, the positioning result by the WLAN positioning calculation unit by determining whether or less than the first threshold value A positioning device that determines reliability.
The positioning device according to claim 3 ,
The positioning device is configured such that the first threshold is set based on an error in the position information.
The positioning device according to any one of claims 1 to 4 ,
The WLAN positioning calculation unit detects the position of the access point from a database in which the identifier of the access point is associated with the position of the access point, and performs positioning based on the position and the received signal strength of the radio wave. Positioning device to perform.
The positioning device according to claim 5 ,
And wherein when it is determined not to adopt the positioning result by the WLAN positioning calculation unit, the satellite positioning portion satellite positioning position acquisition unit that acquires measurement position position that is positioning by by the positioning result adoption determination unit,
Positioning device and a positioning result notification unit for notifying the obtained measured position by the satellite positioning position acquisition unit, or the positioning result by the WLAN positioning calculation unit in the network.
Wherein the location information, location methods information Ru contains based on the base station area information acquired when the positioning by A-GPS method is performed.
JP2010121004A 2010-05-26 2010-05-26 Positioning apparatus and method Active JP5249991B2 (en)
JP2010121004A JP5249991B2 (en) 2010-05-26 2010-05-26 Positioning apparatus and method
CN 201180023529 CN102884445B (en) 2010-05-26 2011-04-20 Position measuring device and method
US13/581,649 US9008061B2 (en) 2010-05-26 2011-04-20 Positioning device and positioning method
EP20110786441 EP2579065B1 (en) 2010-05-26 2011-04-20 Position measuring device and method
PCT/JP2011/059712 WO2011148741A1 (en) 2010-05-26 2011-04-20 Position measuring device and method
JP2011247738A JP2011247738A (en) 2011-12-08
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