Apparatus and method for locating individuals and objects using tracking devices

A system for monitoring objects and individuals. In this system, a monitoring station is remotely accessible through a user interface. The interface is adapted to provide a visually cognizable rendering of an area and a tool useful for selecting at least a portion of said area, and to communicate a first request signal to provide location coordinates of a first tracking device. The first tracking device comprises a first transceiver adapted to receive the first request signal, and to transmit a first reply signal that comprises a first identification code. In addition, a second tracking device having a second transceiver is adapted to receive the first reply signal, compare the first identification code to a stored identification code, and communicate to the monitoring station a second reply signal that comprises location coordinates of the first tracking device in part responsive to verification of the first identification code.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates generally to the field of communications systems that provide location information. More particularly, the present invention relates in one embodiment to a system for monitoring location information of a tracking unit associated with an individual or object that uses wireless data transfer and/or wireless location and tracking systems and wireless communication system (WCS).

2. Description of Related Technology

In conventional communication systems, location information of individuals may be monitored. For instance, location information such as positional coordinates may be tracked or monitored for a variety of individuals, such as children, Alzheimer's syndrome patients, or mentally ill persons. Furthermore, location information for animals, such as cats and dogs, may be tracked using these conventional systems to locate a lost or stolen animal. In other conventional communication systems, scientists, such as zoologists, track, for example, wild animals to study and collect data related to their mating and/or nocturnal behavioral patterns.

In addition, objects are also tracked or located that use these systems. For example, merchants choose to track the location of goods as part of an inventory function and/or an anti-theft mode. In another example, police often use location-tracking systems to facilitate recovery of stolen automobiles, such as the LoJack™ vehicle recovery system offered by the LoJack Corporation of Westwood, Mass, in the United States. Automobile rental agencies often track a location of automobiles that customers rent to ensure their automobile is maintained within a contracted rental use boundary. Other location systems provided in select automobiles assist a driver navigating to a desired destination, such as the OnStar™ system offered by the OnStar Corporation of Detroit, Mich, in the United States.

Global Positioning System (GPS) technology may be incorporated in these conventional communication systems. GPS technology determines positional information of a GPS receiver based on measuring signal transfer times between satellites having known positions and the GPS receiver. The signal transfer time of a signal is proportional to a distance of a respective satellite from the GPS receiver. Consequently, the distance between the satellite and the GPS receiver can be converted, utilizing signal propagation velocity, into a respective signal transfer time. The positional information of the GPS receiver is calculated based on distance calculations from at least four satellites.

As such, GPS technology provides outdoor, line-of-sight communication between a GPS receiver and a centralized station within areas that are unobstructed by fabricated structures and natural features. Fabricated structures may include multi-story buildings, bridges, dams, and the like. Natural features include mountains, hills, valleys, canyons, cliffs, and the like. Exemplary products, such as Wherifone™ and Guardian Lion™, use GPS technology to track individuals and/or objects from a centralized monitoring station.

A graphical map may be provided with a conventional centralized monitoring station. For instance, the graphical map may be two dimensional, or even a three-dimensional, topological map that depicts landscaping, marine, or other environments. The map typically displays representative icons of individuals and/or objects being tracked. In one example, a mobile device may display the three-dimensional map, including primary regions and sub-regions that are pre-programmed to create a series of overlay maps for viewing on a computer display. In yet another example, map information of a first and second user terminal is synthesized; a map is chosen based on the map information from the database; and the map information is displayed on at least one of the first user and the second user terminal. In another GPS conventional communication example, GPS positioning information is transmitted from a GPS unit and between peripheral devices, such as between a camera and a Palm Pilot, through a local wireless communication unit or interface.

GPS systems generally representative of the above apparatuses include, e.g., those described in U.S. Pat. No. 7,064,711 to Strickland et al. entitled “Method for Iterative Determination of Distance between Receiving Station and Transmitting Station and Also Calculating Unit and Computer Software Product” issued Jun. 20, 2006. In yet another example, U.S. Pat. No. 7,065,244 to Akimov issued on Jun. 20, 2006, and entitled “Method for Mapping a Three Dimensional Area” demonstrates the above GPS systems.

Still other representative prior art patents include U.S. Pat. No. 7,065,370 to Ogaki et al. entitled “Positioning Information Transmitting Device and Positioning Information Transmitting/Receiving System” issued on Jun. 20, 2006, and U.S. Pat. No. 7,065,348 to Aoki entitled “Communication System for Providing Information on Position of Communication Party” Also issued on Jun. 20, 2006.

In summary, the prior art provides a user limited flexibility to adjust a controlled monitoring area about an object. In addition, the prior art provides limited flexibility for a user choosing and creating custom maps for viewing and locating objects. Furthermore, the prior art has limited capability for viewing objects by a remotely located user. Finally, the prior art has limited ability calculating positional data of objects when GPS signaling is not available.

Thus, what is needed are apparatus and methods for wireless data transfer and/or wireless location and tracking systems that provide additional advantages over conventional systems. These advantages would include, inter alia, calculating positional data and location coordinates of tracking devices when GPS signaling is unavailable, providing graphical displays for subscribers which aid monitoring and tracking objects and/or individuals, and/or providing security measures when monitoring tracking devices to prevent unauthorized detection and spying on individuals.

SUMMARY OF THE INVENTION

In a first aspect of the present invention, a system for tracking is disclosed. In one embodiment of this system, a monitoring station is remotely accessed through a user interface. The interface is adapted to provide a visually cognizable rendering of an area and a tool useful for selecting at least a portion of said area, and to communicate a first request signal to provide location coordinates of a first tracking device. The first tracking device includes a first transceiver adapted to receive the first request signal, and to transmit a first reply signal that comprises a first identification code. A second tracking device is also provided having a second transceiver that is adapted to receive the first reply signal, compare the first identification code to a stored identification code, and communicate to the monitoring station a second reply signal. The second reply signal includes location coordinates of the first tracking device in part responsive to verification of the first identification code.

In a second aspect of the invention, a system is disclosed comprising a first and a second tracking device. In one embodiment, the first tracking device has a first transceiver to receive a first request signal and to transmit a first reply signal. The first reply signal comprises first location data, a first microprocessor to process a first request signal provided through a subscriber interface that is remotely located, and a first identification code that is communicated as part of a first reply signal. In addition, a second tracking device has a second tracking transceiver that receives the first reply signal, and verifies the first identification code as a recognized code. In response to verification, the second tracking device communicates a second reply signal that comprises a second identification code to the first tracking device. In response to the second reply signal, the first tracking device calculates a relative distance between the first and the second devices. Furthermore, the first tracking device communicates an adjustment signal that comprises verbal or audio queues that indicate directional information of the first tracking device in relation to the second tracking device.

In a third aspect of the present invention, a method is disclosed for locating an individual or an object. In one embodiment, the method includes receiving a location request from a user and activating a positioning apparatus associated with the tracking device. The method further includes transmitting to a tracking device: a first signal from a monitoring station, a second signal from a wireless location and tracking system, a third signal from a mobile transceiver, and a fourth signal from an adjacent tracking device. The method further includes determining which of the first signal, the second signal, the third signal, and the fourth signal match defined selection criteria that is stored in the tracking device. The method may further include the steps of determining location data in part based on a signal selected utilizing the defined selection criteria, transmitting the location data to the monitoring station for analysis to determine a location of the tracking device; and informing the user of the location of the tracking device on a map.

In a fourth aspect of the invention, a system for tracking object is disclosed. In one embodiment, the system includes a wireless monitoring device associated with a remote user, and a first tracking device that provides a wireless positioning signal to a monitoring station. A mapping apparatus is further included that maps first location coordinates of the first tracking device on a map comprising an arbitrarily shaped safe zone. The remote user, in one embodiment, is capable of locating, tracking, and communicating with the first tracking device through a monitoring station. Furthermore, the monitoring station may be adapted to monitor the first location coordinates and second location coordinates of a second tracking device so that positioning information of each is accessible to the remote user.

DETAILED DESCRIPTION

As used herein, the terms “location coordinates” refer without limitation to any set or partial set of integer, real and/or complex location data or information such as longitudinal, latitudinal, and elevational positional coordinates. The terms “tracking device” refers to without limitation to any integrated circuit (IC), chip, chip set, system-on-a-chip, microwave integrated circuit (MIC), Monolithic Microwave Integrated Circuit (MMIC), low noise amplifier, power amplifier, transceiver, receiver, transmitter and Application Specific Integrated Circuit (ASIC) that may be constructed and/or fabricated. The chip or IC may be constructed (“fabricated”) on a small rectangle (a “die”) cut from, for example, a Silicon (or special applications, Sapphire), Gallium Arsenide, or Indium Phosphide wafer. The IC may be classified, for example, into analogue, digital, or hybrid (both analogue and digital on the same chip and/or analog-to-digital converter). Digital integrated circuits may contain anything from one to millions of logic gates, invertors, and, or, nand, and nor gates, flipflops, multiplexors, etc. on a few square millimeters. The small size of these circuits allows high speed, low power dissipation, and reduced manufacturing cost compared with board-level integration.

Furthermore, the terms “wireless data transfer,” “wireless tracking and location system,” “positioning system,” and “wireless positioning system” refer without limitation to any wireless system that transfers and/or determines location coordinates using one or more devices, such as Global Positioning System (GPS). The terms “Global Positioning System” refers to without limitation any services, methods, or devices that utilize GPS technology that determine a position of a GPS receiver based on measuring signal transfer times between satellites having known position1s and the GPS receiver. The signal transfer time for a signal is proportional to a distance of the respective satellite from the GPS receiver. The distance between the satellite and the GPS receiver may be converted, utilizing signal propagation velocity, into the respective signal transfer time. The positional information of the GPS receiver is calculated based on distance calculations from at least four satellites. Furthermore, the term “wireless communication system” refers to any system that uses communication stations and a wireless location means for determining positional coordinates such as Global Positioning Radio Service (GPRS).

Overview

In one salient aspect, the present invention discloses apparatus and method of calculating, inter alia, determining location coordinates of a first tracking device. In particular, the first tracking device has a first transceiver. The first transceiver receives a first request signal from a remote user terminal equipped with a map. The first transceiver transmits a first reply signal including a first identification code. The second tracking device has a second transceiver. The second transceiver advantageously provides for receiving the first reply signal and comparing the first identification code to a stored identification code. Upon verification of the first identification code, the second transceiver calculates the location coordinates of the first tracking device without the need for the first tracking device directly connecting to GPS satellites. The second transceiver communicates a second reply signal to the monitoring station. The second reply signal comprises the location coordinates.

Broadly, the present invention generally provides a system and method for locating and tracking an individual or an object. The system produced according to the present invention may find beneficial use for locating and tracking people, such as missing, lost, or abducted persons, Alzheimer's syndrome patients, or mentally ill persons. The system may also be useful for locating and tracking animals. Additionally, objects, such as vehicles, goods, and merchandise may be located and tracked with the system produced by the present invention. Although the following discussion may use lost or abducted child as an exemplary demonstration, it is to be understood that this discussion is not limiting and that the present invention may be used in other suitable applications.

The present invention may be used to locate and track a tracking device that is concealed on an individual (such as in a pocket, backpack, shoe, button, shirt collar, woven into fabric of a jacket or sweater, or the like). Consequently, in the event of abduction, an abductor is unlikely to remove and discard a concealed tracking device as compared to conventional tracking devices that are conspicuously displayed. For example, conventional tracking devices are generally incorporated as part of a conspicuous device, such as with or part of a mobile phone, pager, personal data assistant, or any other recognizable electronic device.

Additionally, conventional systems depend upon maintaining direct outdoor line-of-sight communication between a global positioning system (GPS) satellite and a tracked object. The system of the present invention does not require direct line-of-sight and the system effectively locates and tracks individuals and objects in indoor situations.

Conventional systems often require an individual to activate manually a location system before signals can be received and transmitted between the individual and a person attempting to locate the individual. However, in one embodiment, the system of the present invention may be passive in that a user may remotely activate the tracking device, instead of the tracking device remaining constantly on, once the user attempts to locate the tracking device. In one embodiment of the invention, no action is required on the behalf of an individual having the tracking device being located and tracked. In yet another instance, one or more tracking devices may be remotely activated to monitor and determine location coordinates (or relative distance from a second tracking device) of a first tracking device. In yet another instance, a first tracking device, and a second tracking device are remotely monitored by a user using a wireless device, such as a cell phone, utilizing a monitoring station.

Referring now toFIGS. 1-5, exemplary embodiments of the tracking and monitoring system of the invention are described in detail. It will be appreciated that while described primarily in the context of tracking individuals or objects, at least portions of the apparatus and methods described herein may be used in other applications, such as for example and without limitation. Some applications include control systems that monitor components such as transducers, sensors, and electrical and/or optical components within an assembly line process.

Moreover, it will be recognized that the present invention may find utility beyond purely tracking and monitoring concerns. For example, the “tracking device” and “user-defined mapping criteria” described subsequently herein may conceivably be utilized to improve other applications; e.g., increasing functionality and electrical properties of circuits utilized to improve computational efficiency and increase accuracy of calculated quantities. The calculated quantities may include velocity of objects traveling through an assembly line process for determining which portions of the process are running efficiently and which portions may require process improvements or modifications. Other functions might include module assembly (e.g., for purposes of providing transceivers that provide multiple methods and user choices for displaying electrical properties and measurement parameters during testing and/or operations before, during or after wireless module completion, and so forth). Myriad of other functions will be recognized by those of ordinary skill in the art given the present disclosure.

FIGS. 1A and 1Billustrate a positioning and tracking system400for defining an arbitrary shaped safe zone405in accordance with an embodiment of the present invention.

Referring toFIG. 1A, an image selection tool401, e.g., screen pointer, is utilized to select a visually cognizable rendering of an area, e.g., selecting at least a portion of an area, on a subscriber interface403, e.g., a web-based interface. The area selected by the image selection tool401, for example, may be a safe zone405. The safe zone405is an area that a user (a subscriber) specifies as a low injury risk area for individuals and/or objects. The safe zone405defined or described is specified utilizing one or more parameters. For instance, the safe zone405, e.g., a home zone, may be specified, e.g., be establish by a user-defined mapping criteria using any of the following parameters: zip code boundaries, addresses, landmarks, buildings, mountain ranges, a WiFi hot spot, and distances from a specified location, such as one chosen by a subscriber. Upon the first tracking device402possessed by an individual traveling more than one mile from the safe zone405, an alarm alert is sent to a user. In yet another example, an alarm is sent when the first tracking device402travels outside of a circularly shaped boundary421about a location423, such as a WiFi network located in a coffee shop or “WiFi hot spot” designed area, within the safe zone405.

Furthermore, the system400allows a user to draw an area such as a safe zone405, which may be an arbitrary shaped zone, e.g., a closed shaped user-defined polygon or a circle. For instance, a parent and/or scoutmaster may enter the safe zone405that encompasses a small neighborhood408, a school campus425, a stadium430, a national park435, or the like, and excludes other areas such as an automobile repair shop440, warehouse445, and high automobile traffic areas446. Upon a child having the first tracking device402leaving the user-defined polygon region, e.g., the safe zone405, an alert such as an audible alarm will be sent to a parent or guardian of the child.

As shown inFIG. 1B, the system400attempts to contact individuals on a notification list408if the child enters a danger zone, such as a riverbed447. The notification list408may be prepared in a subscriber-defined order. For instance, if a user504, such as one of the parents, is first on the notification list408, the system400communicates a message to the user504using email, SMS, voicemail, and telephone call. In one optional feature, an individual on the notification list408is required to confirm receipt of the message. Otherwise, the system400continues to contact other individuals on the notification list408until it receives a confirmation message from that individual. In another embodiment, the system400is time limited so that monitoring may be enabled or disabled based on or in response to user-defined features. Such user-defined features may include enabling or disabling monitoring during a specific time of day or day of the week.

For instance, the tracking features may be shut off on Saturday or Sunday or when the child is located in the home. In one variation of the present embodiment, multiple individuals or subscribers may establish (or share (e.g., pool) existing or newly established) user-defined features; including safe zones or periods, which may apply to one or multiple tracking devices, such a first and second tracking devices402,410. The pooling of subscriber's tracking devices provides an added benefit including synergy and sharing of electronic data so that one tracking device can benefit from electronics and/or positional location of other tracking devices. For example, a low signal level tracking device can utilize a nearby tracking device, such as one owned by another subscriber, to triangulate their signal to a satellite of a wireless tracking and location system, such as GPS satellite system. In yet another example, a low signal level-tracking device can utilize location coordinates of a nearby tracking device as its own so that a user405can determine an approximate location of the low level-tracking device.

FIGS. 2A,2B,2C, and2D illustrate a positioning and tracking system500for locating the first tracking device402. Referring toFIG. 2A, the first tracking device402may optionally be hidden in a remote location, camouflaged, and/or incorporated as part of the individual's clothing and/or object and/or object packaging. In one exemplary instance, the first tracking device402is located inside a button of a sweater of the individual being tracked. The first tracking device402may be, in a variation of the present embodiment, pre-programmed with an identification code (e.g., a first identification code). The identification code, in one embodiment, uniquely identifies the first tracking device402and prevents unauthorized individuals accessing the first tracking device402. The first tracking device402may be activated by an individual possessing the first tracking device402. In one alternative, the device402can be remotely activated by a user504, a monitoring station506, a nearby base station508, and/or a second tracking device410. The system500may transmit the user's identification code (a second identification code) to the first tracking device402, which user's identification code prevents unauthorized access to the first tracking device402to reduce the possibility of unauthorized device monitoring.

In one embodiment, the monitoring station506receives a location request and user's identification code from the user504. Afterwards, the monitoring station506transmits a signal that includes the user's identification code. The location request may be from the user504for location data associated with the first tracking device402. When the user504seeks to locate and track an object, such as a first tracking device402, the user504may issue the location request to the monitoring station506using a communication device516, such as a cellular phone or Personal Communications System (PCS) telephone. In other embodiments, the device516may be any of the following: a land-based telephone (“landline”), a computer connected to the Internet, a personal digital assistant, a radio, a pager, hand delivery, or the like. The user504may provide the monitoring station506with the user's identification code to prevent unauthorized tracking. In one example, the second tracking device410utilized by the user504determines location coordinates of the first tracking device402, in this example, that is also owned by the user504.

As shown inFIG. 2A, the second tracking device410receives a signal of a designated signal strength that includes the user's identification code. The second tracking device410is disposed on a second individual511, such as a second child. The second tracking device410may be concealed and secured, e.g., sewn, glued, or taped, into a portion of the clothing512if desired. For instance, the second tracking device may be part of or concealed within a button, sweater, shirt, pocket, sleeve, or the like. In another alternative, the second tracking device410may be incorporated and concealed as part of the second individual's belongings514, such as wallet, pen, pencil, tape recorder, or the like.

The second tracking device410compares a stored identification code with the user's identification code. If the identification codes match, e.g., are verified, then the second tracking device410requests information from the first tracking device402. The second tracking device410, in this example, requests information, such as last known or last location coordinates (such as longitudal, latitudinal and elevational position, an address, a nearby landmark and the like) from the first tracking device402. For instance, data or positional information is determined using a wireless location and tracking system, such as GPS satellite system.

Referring toFIG. 2A, the second tracking device410sends a positioning signal to the first tracking device402. Afterwards, the first tracking device402sends a return positioning signal. Continuing with this example, at the second tracking device410, a phase difference and/or time delay signal is generated between the positioning signal and the return positioning signal. The phase difference and/or the time delay is converted to a delta distance between the tracking devices402,410utilizing a propagation velocity of the signaling area, for example air. The second tracking device410communicates the delta distance and tracking data of the second tracking device410. The delta distance and the tracking data are utilized to calculate the location coordinates, e.g., last known location or present location coordinates, of the first tracking device402. Afterwards, the location coordinates of the first tracking device402are communicated by the second tracking device410to any or all the following: the user504, the nearby base station508, and monitoring station506.

For calculating a velocity or relative change in velocity of the first tracking device402, the relative distance, as discussed above, is calculated for multiple periods, e.g., at discrete or sequential time intervals. Distance calculations at various time intervals are utilized to determine rate of change of the tracking device402. The rate of change, in this example, directly relates to a velocity or a relative velocity that the first tracking device402is moving relative to the second tracking device410. In the alternative, the first tracking device402may be measured relative to another designated stationary, moving object, a tree, landmark, or WiFi network, such as one from at a local coffee shop. In one embodiment, a warning signal, which may consist of an audio response or a light display, such as pulsing light array, would result if the first tracking device402has a calculated velocity faster than a subscriber, e.g., user504, set limit. For example, upon a child possessing the first tracking device402being detected traveling more than 60 mph, e.g., above a 55 mph limit set by the subscriber, a warning signal, such an electrical stimulation, light, sound, or the like, will be sent. The warning signal is sent to at least one of a subscriber, e.g., such as user504to indicate their child may have been abducted or driving an automobile faster than 55 mph, or to the child, e.g., that warns a teenager to stop driving so fast. Furthermore, the warning signal provides an audible measure of the first tracking device402traveling further away or closer to the second tracking device410without the need for the subscriber interface (as described inFIGS. 1A,1B) to monitor the first tracking device402.

In one variation of this embodiment, the first tracking device402or the second tracking device410may have a compass472,473respectively and, in one optional step, provide a warning signal to a user504or an individual possessing the tracking device402. In one application, a first boy scout has the first tracking device402and a scoutmaster has the second tracking device410so that each may determine a relative direction (and or relative movement) from each other where GPS is not available. Furthermore, the compasses472,473provide discrete and private directional information so the second tracking device410may locate another tracking device, e.g., a first tracking device402, without supervision and/or support of a user504and/or the monitoring station506.

In the above example, the second tracking device410utilizes the location information stored in the first tracking device402when the first tracking device is out-of-range of GPS positioning satellites. Consequently, positional information and/or coordinates of the first tracking device402may be advantageously measured even when the first tracking device402is out of range (or RF shielded from), for example, of a minimum number of required GPS satellites. In yet another embodiment, additional tracking devices, a third tracking device516and a fourth tracking device518, may be provided. These additional tracking devices provide additional relative distance measurements from the first tracking device402. Consequently, these additional devices utilized as part of triangulation distance calculations may potentially increase accuracy of location coordinates of the first tracking device402.

Referring toFIG. 2B, a first mobile transceiver station509communicates between the first tracking device402and the monitoring station506. A second mobile transceiver station507communicates between the first tracking device402and the monitoring system506. The monitoring station506remotely accesses the first tracking device402through a subscriber interface, such as subscriber interface403inFIGS. 2A and 2B. The subscriber interface403(shown inFIG. 1A) provides a screen pointer tool401to the subscriber (user)504for selecting an arbitrary shaped zone, e.g., the safe zone405, on a map409. Using the subscriber interface403, the subscriber504communicates a first request for position coordinates of a first tracking device402. Furthermore, the first tracking device402has a first transceiver, e.g., including a signal receiver801and a signal transmitter815shown inFIG. 5, to receive the first request signal and to transmit a first reply signal that comprises a first identification code. The first tracking device402receives a second identification code from a monitoring station506and compares this code to a stored identification code.

In this same embodiment, upon determining that the second identification signal code matches the stored identification code, the signal transmitter815(seeFIG. 5) transmits its last position coordinates to the monitoring station506. In one variation of this embodiment, low signal detection circuitry monitors received signal strength of a positioning signal. Upon the low signal detection circuitry832(seeFIG. 5) determining received signal strength, such as when the positioning signal, e.g., global positioning signal, is detected above a defined level, the first tracking device402switches to a wireless location and tracking mode, e.g., GPS mode, receives positioning signal coordinates, and stores these coordinates as its current position coordinates.

In this example, the user504provides the location request to the monitoring station506by at least one of a telephone communication and an electronic message via Internet532. The monitoring station506provides, in one example, the position signal to the user504as an electronic message over the Internet532. In another alternative, the monitoring station506may provide the position signal to the user504as a voice message when the user504provides the location request by a telephone communication.

The location request and any response from the monitoring station506may be sent to a server520. The server520may be used in cooperation with the monitoring station506for verifying information transmitted and received between the user504and the monitoring station506. The monitoring station506may include a database557for storing the user's identification code sent by the user504. The monitoring station506may compare the user's identification code received with the location request to the stored identification code in the database to determine if the user's identification code (received from the user504with the location request) is valid. In these embodiments, the systems500,505,513, and514may communicate in data format only; therefore, the systems500,505,508, and510will not compete for costly voice spectrum resources. Consequently, the present invention does not require the use of a mobile identification number (MIN). The identification codes (first identification code and second identification code) may comprise an electronic serial number (ESN).

Referring toFIG. 2C, the first tracking device402travels within direct-line of sight of a wireless data transfer and or wireless location and tracking system. One exemplary example, the wireless data transfer and/or wireless location and tracking system is Global Positioning System (GPS). GPS satellites, for example524a-d, calculate location data (such as a longitudinal, latitudinal, and elevation position, an address, a nearby landmark, and the like) of the first tracking device402. The time it takes a global positioning system signal from a GPS satellite524a-dto reach the first tracking device402is utilized to calculate the distance from the GPS satellite524a-dto the first tracking device402. Using measurements from multiple GPS satellites (e.g., four GPS satellites524a-d), the system513triangulates a location for the first tracking device402. Triangulation provides latitude and longitude information by comparing the measurements from the multiple GPS satellites524a-dto the first tracking device402. The measurements may include distances between two or more GPS satellites524a-dand relative orientations of the GPS satellites524a-dto the tracking device402and the earth. In this embodiment, the location470of the first tracking device402is, for example, updated, on any of the following update schedules: a continuous, automatic, periodic, and/or upon user request. When the user504requests a communication update, the location407is communicated to the monitoring station506.

At the monitoring station506, the location470, in one embodiment, is stored. Upon a user504requesting the location470of the first tracking device402on their wireless device, e.g., the cell phone516or the like, the location470is displayed on a user-defined map, such as shown at map409inFIG. 1A. Furthermore, the monitoring station506may track also the second tracking device410on the display400(shown inFIG. 1). As such, location coordinate measurements and warnings of the first tracking device402and the second tracking device410may be coordinated, monitored, and/or tracked, including relative distances between the devices402,410. The user504may remotely monitor the devices402,410using the cell phone516.

In contrast, conventional monitoring systems had limited capability of monitoring multiple tracking devices, such as requiring a centralized monitoring station, limited remote access to tracking device information for users, and limited mapping capabilities. In the present invention, the monitoring device506and the cell phone516allow multiple tracking devices, such as402,410, to be remotely monitored, coordinated and distance within or from a safe zone calculated, even when not within a line-of-sight of a wireless location and tracking system. Furthermore, a user504defines the safe zone405, as shown inFIG. 1A, which option increases display monitoring accuracy by providing precise boundaries for safe and unsafe zones and displaying the first and second tracking devices either inside or outside the boundary.

Referring toFIG. 2D, another wireless data transfer, and wireless location and tracking system is disclosed. This system includes a first transmitter/receiver station530, e.g., a base station, for communicating between the first tracking device402and monitoring station506. The first transmitter/receiver station530may be connected to a wireless network operator (not shown) and a public switched telephone network (PSTN)531. A user's identification code may be sent within a signal to the first transmitter/receiver station530. The signal may then be sent from the first transmitter/receiver station530to the tracking device402. In the system514, a second transmitter/receiver station535may be utilized to locate and track the first tracking device402. The second transmitter/receiver station535, in this example, communicates location coordinates between the first tracking device402, the second tracking device410, and the monitoring station506. By triangulating positional coordinates between and among the first and second stations530,535of the first tracking device402, similar to discussions associated withFIGS. 2a-dandFIG. 3, location coordinates of the first tracking device402are computed.

FIG. 3illustrates a positioning and tracking system utilizing a wireless communication system to determine location coordinates for the first tracking device in accordance with an embodiment of the present invention. In this example, the wireless communication system (WCS) is General Packet Radio Service (GPRS). General Packet Radio Service (GPRS) signals locate and track the first tracking device402. GPRS is a non-voice service that allows information to be sent and received across a mobile telephone network. GPRS may supplement Circuit Switched Data (CSD) and Short Message Service (SMS). In yet another exemplary wireless data transfer and/or wireless location and tracking system, upon the first tracking device402not being accessible by GPS or other communication means, a plurality of transmitter/receiver stations may be utilized. For example, the first transmitter/receiver station602, e.g., a mobile base station, and the second transmitter/receiver station603, e.g., a mobile base station, may be deployed. These stations602,603send location coordinates of the first tracking device402through the second tracking device410and the monitoring station506. The first transmitter/receiver station602communicates with the second tracking device210with Signal #1. The second transmitter/receiver station603communicates with the second tracking device410with Signal #2. In this same example, Signal #3may serve to communicate between the first transmitter/receiver station602and the second transmitter/receiver station603.

By triangulating the location of the second tracking device410, a location may be determined for the second tracking device410. Following, a relative distance, as discussed above inFIGS. 2a-d, is determined between the second and the first tracking devices410,402. Afterwards, the location coordinates of the first tracking device402are obtained using the location of the second tracking device410and a delta distance, e.g., relative distance, of the first tracking device402from the second tracking device410.

The tracking device402may be associated with an object, such as an automobile620. By placing the first tracking device402anywhere within or on the automobile640, the system600may locate and track the automobile640. Likewise, the system600may be used for locating and tracking an individual. The individual, such as a child, may be located and tracked when the individual, such as shown inFIGS. 2a-d, possesses the first tracking device402. For example, the individual (similar to the individual inFIG. 2for the second tracking device410) may carry the first tracking device402in a pocket in the individual's clothing, in a backpack, wallet, purse, a shoe, or any other convenient way of carrying. As described above, locating and tracking the individual may be accomplished through use of a Signal #1and #2.

It is to be understood that although the automobile640and the individual are herein used to exemplify locating and tracking, the system600may be used to locate and track many other objects, inanimate (such as merchandise or any vehicle, vessel, aircraft, etc.) and animate (such as pets, domesticated animals, or wild animals).

FIG. 4shows a plan view of a positioning and tracking system700for locating a first tracking device402using other user's tracking devices. In one variation ofFIG. 1, a user504may receive permission or previously have received permission to utilize the tracking device735. In this example, the tracking device735is owned by another user. When the tracking device735is located within a communication range of the first tracking device402, the user504may request its use by providing a proper identification number. In yet another variation, groups of users, such as owners of tracking devices730,735,740, and745, etc. may pool their resources so that any of these devices are available to others in the group.

In other words, the group of owners for730,735,740, and745may utilize other users tracking devices, e.g., like those near a desired device to track. In one alternative embodiment, each of the group of owners shares security codes. In this alternative embodiment, each owner of the group has permission to limit usage of their tracking device to others of group members (as well as others outside of the group of users). Furthermore, each of the tracking devices730,735,740, and745may have one or more communication channels, such as A, B, C, D, etc . . . . Consequently, multiple users of the group may utilize different channels on the same tracking device(s) to determine location coordinates in a substantially simultaneous and/or sequential manner for each of their tracking devices during a specified period (for example one specified by a subscriber). For instance, the tracking device730may have four communication channels, e.g., A, B, C (not shown), D (not shown), where A is utilized to track the first tracking device402and B is utilized to track the second tracking device410during a substantially similar period.

FIG. 5is a block diagram of the first tracking device402in accordance with an embodiment of the present invention. The tracking device402may comprise a signal receiver801for receiving a signal from the monitoring station506(shown inFIG. 2). The signal may include the user's identification code (second identification code), sent by the user504(shown inFIG. 2). The first tracking device402may comprise a microprocessor/logic circuit810. The microprocessor/logic circuit810may store a first identification code to produce a stored identification code, determine a location of the first tracking device402, and generate a position signal that contains location data (such as a longitudinal, latitudinal, and elevational position, an address, a nearby landmark, and the like) for the tracking device402.

The tracking device402may further comprise an erasable programmable read-only memory (EPROM)807for storing operating software for the microprocessor/logic circuit810. A positioning system logic circuit812may be used for calculating location data (such as a longitudinal, latitudinal, and elevational position, an address, a nearby landmark, and the like) for the first tracking device402to be sent to the microprocessor/logic circuit810and subsequent transmission to the monitoring station506(shown inFIG. 2).

The tracking device402may comprise a signal transmitter815. In one embodiment of the invention, a single transceiver may be substituted for the signal transmitter801and the signal transmitter815. An antenna817may be connected to the signal transmitter815and an antenna817may be connected to the signal receiver800. The signal transmitter815may allow the first tracking device402to transmit a signal to the monitoring station506(shown inFIG. 2) and thus transmit location data (such as a longitudinal, latitudinal, and elevation position, an address, a nearby landmark, and the like). The signal receiver801may allow the first tracking device402to receive the signal from the monitoring station506(shown inFIG. 2) to allow the user504(shown inFIG. 2) to send a location request by at least one of a telephone communication and an electronic message via the Internet.

An input port connector820may be connected to the microprocessor/logic circuit810for inputting the stored identification code (first identification code) for storage in memory825. The microprocessor/logic circuit810may be connected to receive operating power from a power supply830. The power supply830may be any type of battery that is small enough to fit inside of the tracking device402. A charging circuit835may be connected to the power supply830for recharging the power supply. The charging circuit835, for example, may be a charging circuit such that an external magnetic battery recharger may provide recharging electricity to the charging circuit835for recharging the power supply830whenever the power falls below a predetermined level.

A power level sensor836may be connected between the power supply830and the microprocessor/logic circuit810for sensing the power level of the power supply830and providing the sensed power level to the microprocessor/logic circuit810. The microprocessor/logic circuit810may generate a power level signal to be transmitted with the signal transmitted.

FIG. 6A,6B are a logical flow diagrams illustrating one exemplary embodiment of a method900for locating an individual or an object in accordance with another embodiment of the present invention. This method is based on components previously discussed inFIGS. 2a-dand3.

As shown in one embodiment as depicted inFIG. 6A, a location request sent from a monitoring station is received at an activated tracking device (S901). Upon recognizing a user identification code (S902), the activated tracking device's positional coordinates are provided (S903). A rendering of the activated tracking device is placed on a map; the map depicts the activated tracking device's position relative to a user designated safe zone (S904).

As shown in another embodiment as depicted inFIG. 6B, the tracking device is activated (S908). A monitoring station sends a signal and the signal is received at the tracking device—the signal includes a location request and optionally a user's identification code (S909). The tracking device recognizes the user's identification code as a location request pertaining to the tracking device (S910).

System signal coordinates are being requested (S915). In step S920, a level of a received signal strength of the positioning satellite coordinates is determined if it is above a defined value (S920). In one embodiment, upon the received signal strength being above the defined value, a response is formatted and provided for the location request including the positioning satellite coordinates, where the response includes location data pertaining to the tracking device (S925). The response is transmitted to a server (S930). The tracking device location is drawn within a map that comprises a safe zone (S935). The tracking device location is drawn within a map using a mapping service, such as the Kivera Location Engine™ provided by Kivera, Incorporated of Oakland, Calif., in the United States or the MapQuest™ mapping service provided by MapQuest, Incorporated of Denver, Colo, in the United States.

The mapping service may use location data, such as the longitudinal, latitudinal, and elevational position, to provide an address near the location tracked (“nearest location address”) comprising a street name, postal code (zip code) or a nearest known landmark. The mapping service may then forward the location data to the user504(FIG. 2) via the monitoring station506(FIG. 2).

The method may further comprise the additional step (S940) of receiving a positioning system signal from a positioning satellite, and a step (S945) of calculating location data from the positioning system signal. The method may further include the step (S950) of receiving a first general packet radio service signal from a first transmitter/receiver station.

The method may also include the step (S950) of calculating location data from the first general packet radio service signal. The method may further comprise the additional step (S955) of receiving a second general packet radio service signal from a second transmitter/receiver station and may comprise calculating location data from the second general packet radio service signal.

FIGS. 7A,7B are logical flow diagrams illustrating another exemplary embodiment of a method for locating an individual or an object in accordance with another embodiment of the present invention. This method is based on components previously discussed inFIGS. 2a-dand3.

InFIG. 7A, one embodiment of the method is disclosed. In this embodiment, a tracking device is associated with an individual or an object (S1001). A location request is received from a user (S1002). Signals are transmitted to the tracking device from one or more locations, for example, from a monitoring station, a wireless location and tracking station, a mobile transceiver, and an adjacent tracking device (S1003). Based on signal selection criteria, the tracking device at least one signal is selected (S1004). The signal selection criteria, in one example, may be based on signal strength level, availability of signal, and/or ownership of a system providing the at least one signal. Location data is determined in part based on the signal selection criteria (S1005). The location data is transmitted to the monitoring station, for example, for further processing (S1006). A user is informed of the location of the tracking device on a map (S1007).

InFIG. 7B, another embodiment of the method for locating an individual or an object is disclosed. In this method, a tracking device is associated with the individual or the object to be located (S1008). A location request is received from a user (S1010). A signal is transmitted from a monitoring station to the tracking device (S1015). Following, a positioning system circuit is activated within the tracking device (S1020). A positioning signal strength of a received positioning system signal is calculated (S1025). A mobile signal is transmitted from a mobile transceiver to the tracking device (S1030).

A mobile signal strength is calculated of a received mobile signal (S1035). A tracking signal is transmitted from an adjacent tracking device (S1040). A tracking signal strength is calculated of a received tracking signal (S1045). Determining which of the positioning system signal, the received mobile signal, and the received tracking signal match a defined signal selection criteria stored in the tracking device (S1050).

Location data is calculated based in part on a signal selected utilizing the defined criteria (S1055). The location data is transmitted to the monitoring station for analysis to determine a location of the tracking device (S1060). A user is informed of the location of the tracking device on a map (S1070). It is noted that many variations of the methods described above may be utilized consistent with the present invention. Specifically, certain steps are optional and may be performed or deleted as desired. Similarly, other steps (such as additional data sampling, processing, filtration, calibration, or mathematical analysis for example) may be added to the foregoing embodiments. Additionally, the order of performance of certain steps may be permuted, or performed in parallel (or series) if desired. Hence, the foregoing embodiments are merely illustrative of the broader methods of the invention disclosed herein.