Patent Publication Number: US-2022222989-A1

Title: Auto-calibration apparatus, device, and server, auto-calibration method, and storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of China Patent Application No. 202110035170.3 filed Jan. 12, 2021, the entire contents of which are incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The invention relates to the field of vehicle calibration, and specifically, to an auto-calibration apparatus, device, and server, an auto-calibration method, and a storage medium. 
     BACKGROUND ART 
     More and more passive entry passive start (PEPS) systems has been deployed in vehicles due to their convenience. A basic operating principle of PEPS is closely related to a distance between a man who holds a key to a vehicle and the vehicle. To measure the distance between a man who holds a key to a vehicle and the vehicle, a specific electromagnetic signal emitted from the key needs to be acquired, and a distance value is to be obtained through analyzing the signal. This operation requires calibration on a characteristic of the vehicle receiving the electromagnetic signal. However, characteristics of different vehicles receiving the same electromagnetic signal are different, and even different interior and exterior decorations of the same type of vehicles may affect a characteristic of a vehicle receiving an electromagnetic signal. Therefore, it is necessary to propose a mechanism that can provide efficient auto-calibration on vehicles. 
     SUMMARY OF THE INVENTION 
     The invention is intended to provide a mechanism that can provide efficient auto-calibration on vehicles. Details are as follows: 
     According to an aspect of the invention, an auto-calibration apparatus is provided, the apparatus including: a communication unit configured to receive a target position; a positioning unit configured to determine a current position of the apparatus; a computing unit configured to generate a driving signal based on the target position and the current position; a driving unit configured to move the apparatus to the target position based on the driving signal; and a beacon unit configured to broadcast, at least at the target position, a beacon signal used for calibration. 
     In some embodiments of the invention, optionally, the driving unit includes: a driving motor configured to move on a calibration plane; and a support rod configured to move in a calibration vertical direction and extend or retract at a set angle. 
     In some embodiments of the invention, optionally, the driving unit further includes a set of universal wheels configured to be coupled to the driving motor. 
     In some embodiments of the invention, optionally, the positioning unit includes at least one of the following: a gyroscope, an optical positioning apparatus, an acoustic positioning apparatus, and an electromagnetic wave positioning apparatus. 
     In some embodiments of the invention, optionally, the beacon signal includes at least one of the following: a Bluetooth signal, an ultra-wideband signal, and a radio frequency signal. 
     In some embodiments of the invention, optionally, the communication unit is further configured to send an acquisition instruction after the apparatus reaches the target position, and the acquisition instruction includes position and angle information of the current position and an indication of requesting to acquire a signal. 
     In some embodiments of the invention, optionally, the communication unit is further configured to send an end instruction after a preset time is passed since the acquisition instruction is sent, and the end instruction includes an indication of requesting to end acquisition of a signal. 
     In some embodiments of the invention, optionally, the target position includes a plurality of positions. 
     According to another aspect of the invention, an auto-calibration device is provided, the device including: a communication unit configured to: receive an acquisition instruction and an end instruction that are from a requester side, and send calibration information to a server side, where the acquisition instruction includes position and angle information of a current position of the requester side and an indication of requesting to acquire a signal, and the end instruction includes an indication of requesting to end acquisition of a signal; a calibration unit configured to receive a beacon signal from the requester side and perform measurement to generate a measurement value; and a generation unit configured to generate the calibration information based on the measurement value and the position and angle information in the acquisition instruction after the end instruction is received. 
     In some embodiments of the invention, optionally, the measurement value includes at least one of the following: a signal strength indication of a Bluetooth signal and a distance value of an ultra-wideband signal. 
     According to another aspect of the invention, an auto-calibration server is provided, the server including: a storage unit configured to store a calibration case and calibration information of the calibration case, where the calibration case includes a target position; and a communication unit configured to: extract the calibration case, and send the target position related to the calibration case to a requester side and receive the calibration information from a vehicle side, where the calibration information includes position and angle information of the requester side and a measurement value of a beacon signal used for calibration. 
     In some embodiments of the invention, optionally, the server further includes an update unit configured to update and maintain the calibration case stored in the storage unit. 
     According to another aspect of the invention, an auto-calibration method using a calibration apparatus is provided, the method including: receiving a target position from a server side, and determining a current position of the calibration apparatus; generating a driving signal based on the target position and the current position; moving the calibration apparatus to the target position based on the driving signal; and broadcasting, at least at the target position, a beacon signal used for calibration. 
     In some embodiments of the invention, optionally, the moving the calibration apparatus to the target position based on the driving signal includes at least one of the following: moving on a calibration plane, and moving in a calibration vertical direction and extend or retract at a set angle. 
     In some embodiments of the invention, optionally, the beacon signal includes at least one of the following: a Bluetooth signal, an ultra-wideband signal, and a radio frequency signal. 
     In some embodiments of the invention, optionally, the method further includes: sending an acquisition instruction after the calibration apparatus reaches the target position, where the acquisition instruction includes position and angle information of the current position and an indication of requesting to acquire a signal. 
     In some embodiments of the invention, optionally, the method further includes: sending an end instruction after a preset time is passed since the acquisition instruction is sent, where the end instruction includes an indication of requesting to end acquisition of a signal. 
     In some embodiments of the invention, optionally, the target position includes a plurality of positions. 
     According to another aspect of the invention, an auto-calibration method is provided, the method including: receiving an acquisition instruction from a requester side, where the acquisition instruction includes position and angle information of a current position of the requester side and an indication of requesting to acquire a signal; receiving a beacon signal from the requester side and performing measurement to generate a measurement value; receiving an end instruction from the requester side, where the end instruction includes an indication of requesting to end acquisition of a signal; generating calibration information based on the measurement value and the position and angle information in the acquisition instruction; and sending the calibration information to a server side. 
     In some embodiments of the invention, optionally, the measurement value includes at least one of the following: a signal strength indication of a Bluetooth signal and a distance value of an ultra-wideband signal. 
     According to another aspect of the invention, an auto-calibration method is provided, the method including: extracting a calibration case, and sending a target position related to the calibration case to a requester side; and receiving calibration information of the calibration case from a vehicle side, where the calibration information includes position and angle information of the requester side and a measurement value of a beacon signal used for calibration. 
     In some embodiments of the invention, optionally, the method further includes: updating and maintaining the calibration case. 
     According to another aspect of the invention, a computer-readable storage medium is provided, where the computer-readable storage medium stores instructions, and the instructions, when executed by a processor, cause the processor to perform any one of the foregoing methods. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objectives and advantages of the invention will be more thorough and clearer from the following detailed description in conjunction with the drawings, where the same or similar elements are represented by the same reference numerals. 
         FIG. 1  shows an auto-calibration apparatus according to an embodiment of the invention; 
         FIG. 2  shows an auto-calibration device according to an embodiment of the invention; 
         FIG. 3  shows an auto-calibration server according to an embodiment of the invention; 
         FIG. 4  shows an auto-calibration method according to an embodiment of the invention; 
         FIG. 5  shows an auto-calibration system according to an embodiment of the invention; and 
         FIG. 6  shows an auto-calibration apparatus according to an embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     In the invention, an auto-calibration mechanism for vehicles provided below can accurately cover all calibration points, and compared with conventional artificial calibration, would not cause errors of calibration due to gaps of individual skills or experience. According to a principle of the calibration mechanism in the invention, a space can be automatically divided into a welcome locking-unlocking area, a common locking-unlocking area, and a start-up area, where the division is relatively highly precise. 
     According to an aspect of the invention, an auto-calibration apparatus is provided. As shown in  FIG. 1 , the auto-calibration apparatus  10  includes a communication unit  101 , a positioning unit  102 , a computing unit  103 , a driving unit  104 , and a beacon unit  105 . The communication unit  101  is configured to receive a target position. The communication unit  101  is used for enabling the auto-calibration apparatus  10  to receive and send information. Because the auto-calibration apparatus  10  needs to move constantly in a process of calibration, generally, the communication unit  101  may use wireless communication. Certainly, under the premise of not affecting movement of the auto-calibration apparatus  10 , the communication unit  101  may alternatively work in a wired communication manner. This is not limited in the invention. 
     In some examples, the target position received by the communication unit  101  may include only one specific position. In this case, to implement a calibration operation, the communication unit  101  needs to receive the target position a plurality of times. In some examples, the target position received by the communication unit  101  may include a plurality of positions. The auto-calibration apparatus  10  can traverse the positions in a specific logical order, to complete the calibration operation. If the target position received by the communication unit  101  includes a plurality of positions, it can be considered that a calibration case or a complete calibration task is received. Compared with conventional manual calibration, the auto-calibration apparatus  10  can measure more positions, and efficiency thereof is also greatly improved. In some examples, the target position is not limited to two-dimensional/three-dimensional spatial coordinates, and may further include angle information based on requirements. 
     The positioning unit  102  of the auto-calibration apparatus  10  is configured to determine a current position of the auto-calibration apparatus  10 . The current position mentioned herein means position information at a moment of measurement, and the position information is not limited to two-dimensional/three-dimensional spatial coordinates either, and may include angle information (for example, a rotation status of the auto-calibration apparatus  10  relative to an initial status) based on requirements. 
     In some embodiments of the invention, the positioning unit  102  may be a gyroscope, an optical positioning apparatus, an acoustic positioning apparatus, an electromagnetic wave positioning apparatus, or a combination thereof. The optical positioning apparatus may include one or more cameras, for example, may use the cameras to capture a position of an object and position the auto-calibration apparatus  10  based on a change of the position. Similarly, the acoustic positioning apparatus uses acoustic waves to measure a relative distance, to perform positioning. The electromagnetic wave positioning apparatus uses electromagnetic waves to measure a relative distance, to perform positioning. 
     The computing unit  103  of the auto-calibration apparatus  10  is configured to generate a driving signal based on the target position and the current position. The driving signal in the example of the invention is used to enable a power apparatus to form a moving path from the current position to the target position. It should be noted that the communication unit  101 , the computing unit  103 , and the like described above may be integrated on a same common development module which, for example, may be a small development board such as Raspberry Pi. Compared with a conventional calibration solution, the auto-calibration apparatus  10  in the present application has a much lower requirement on computing power, and a difficulty of developing software and hardware is significantly lowered. 
     The driving unit  104  of the auto-calibration apparatus  10  is configured to move the apparatus to the target position based on the driving signal. The driving signal may include control instructions that are sent to drivers of, for example, various electric motors, such that a power apparatus such as an electric motor is triggered to transfer the auto-calibration apparatus  10  from the current position to the target position based on the driving signal. 
     In some embodiments of the invention, the driving unit  104  includes a driving motor and a support rod. The driving motor is configured to move on a calibration plane, and the support rod is configured to move in a calibration vertical direction and extend or retract at a set angle. In some embodiments of the invention, the driving unit  104  further includes a set of universal wheels configured to be coupled to the driving motor. 
     As shown in  FIG. 6 , an auto-calibration apparatus  60  is in a form of a trolley. For clear illustration of a principle, some parts of the auto-calibration apparatus  60  are omitted. Referring to  FIG. 6 , the auto-calibration apparatus  60  includes wheels  601 ,  602 ,  603 , and  604  that are coupled to a driving motor (not shown). As shown in the figure, the wheels  601 ,  602 ,  603 , and  604  form a set of universal wheels in a manner of combination on tire surfaces. The following describes in detail that a beacon unit  606  is placed at an end of a support rod  605 . In some examples, each wheel has a matching driving motor, and when driven by the driving motor, the auto-calibration apparatus  10  may move on a two-dimensional calibration plane. The calibration plane in the example of the invention means a projection of, a position to which a calibration operation may reach, onto the horizontal plane. 
     The support rod  605  includes a part perpendicular to the calibration plane and a part parallel to the calibration plane, where the perpendicular part may trigger the beacon unit  606  to move in a calibration vertical direction (that is, a direction perpendicular to the calibration plane), and the horizontal part may trigger the beacon unit  606  to extend or retract at a set angle (that is, to move forward or backward at the set angle). It should be noted that, a changing angle may be formed between the horizontal part and, for example, an axial direction of the auto-calibration apparatus  60  shown in  FIG. 6  (for example, a long symmetry axis of the rectangular trolley), and this angle may be considered as the “set angle” mentioned above. 
     The auto-calibration apparatus  10 /auto-calibration apparatus  60  (specifically, the beacon unit  105 ) configured in the foregoing manner can implement a particular trajectory that cannot be implemented in a conventional solution, for example, in-situ spinning, longitudinal spinning, curvy retraction, figure-eight pattern reciprocation, etc. 
     The beacon unit  105  of the auto-calibration apparatus  10  is configured to broadcast a beacon signal used for calibration. For example, the beacon unit  105  may broadcast the beacon signal at least at the target position. In an embodiment, after driving the beacon unit  105  to the target position, the driving unit  104  may send an arrival notification to the beacon unit  105 , and then the beacon unit  105  may broadcast the beacon signal at the target position based on the notification. In another example, the beacon unit  105  may alternatively broadcast the beacon signal at any position (where the current position and the target position are included) in a process of moving from the current position to the target position. For example, the beacon unit  105  herein may be an automobile key or a mobile phone that transmits a beacon signal, where the beacon signal is a PEPS working signal sent when the automobile key or the mobile phone works. Generally, the beacon signal has a fixed level characteristic. In some embodiments of the invention, the beacon signal may be a Bluetooth signal, an ultra-wideband signal, a radio frequency signal, etc. The auto-calibration apparatus  10  in the example of the invention may calibrate a vehicle that supports these types of signals. 
     In some embodiments of the invention, the communication unit  101  of the auto-calibration apparatus  10  is further configured to send an acquisition instruction after the auto-calibration apparatus  10  reaches the target position, and the acquisition instruction includes position and angle information of the current position and an indication of requesting to acquire a signal. The acquisition instruction may be received by an auto-calibration device described below. 
     In some embodiments of the invention, the communication unit  101  of the auto-calibration apparatus  10  is further configured to send an end instruction after a preset time is passed since the acquisition instruction is sent, and the end instruction includes an indication of requesting to end acquisition of a signal. The preset time may be preset duration for signal acquisition, and the end instruction may be received by the auto-calibration device described below. 
     According to another aspect of the invention, an auto-calibration device is provided. The auto-calibration device is mounted at positions where calibration for a vehicle is to be performed (so that the auto-calibration device is referred to as a vehicle side sometimes in the present application), and after the calibration is completed, a vehicle-mounted PEPS signal capturing unit is mounted at these positions. As shown in  FIG. 2 , an auto-calibration device  20  includes a communication unit  201 , a calibration unit  202 , and a generation unit  203 . The communication unit  201  is configured to: receive an acquisition instruction and an end instruction that are from a requester side (for example, the auto-calibration apparatus  10  shown in  FIG. 1 ), and send calibration information to a server side (for example, an auto-calibration server  30  shown in  FIG. 3 ). The acquisition instruction received from the requester side includes position and angle information of a current real-time position of the requester side and an indication of requesting to acquire a signal. The auto-calibration device  20  performs a calibration operation based on the information and the indication. The end instruction includes an indication of requesting to end acquisition of a signal. The auto-calibration device  20  suspends a calibration operation based on the indication. 
     The calibration unit  202  of the auto-calibration device  20  is configured to receive a beacon signal from the requester side and perform measurement to generate a measurement value. For example, the beacon unit  105  of the auto-calibration apparatus  10  in  FIG. 1  is configured to broadcast a beacon signal used for calibration. The calibration unit  202  of the auto-calibration device  20  may receive and then measure the beacon signal. Based on a difference between beacon signals, there are different types of measurement values. In some embodiments of the invention, the beacon signal may be a Bluetooth signal or an ultra-wideband signal. Correspondingly, the measurement value is a signal strength indication of the Bluetooth signal or a distance value of the ultra-wideband signal. 
     The generation unit  203  of the auto-calibration device  20  is configured to generate the calibration information based on the measurement value and the position and angle information in the acquisition instruction after the end instruction is received, where the calibration information includes a mapping relationship between the measurement value and the position and angle information in the acquisition instruction. In some examples of the invention, the generation unit  203  may alternatively give a time stamp to the calibration information for subsequent processing. 
     According to another aspect of the invention, an auto-calibration server is provided. As shown in  FIG. 3 , an auto-calibration server  30  includes a storage unit  301  and a communication unit  302 . The storage unit  301  is configured to store a calibration case and calibration information of the calibration case, where the calibration case includes a target position. The calibration case may be associated with a vehicle type, or may be associated with different interior and exterior decorations of the vehicle type. The calibration case includes information used to indicate, for example, various positions where calibration is performed by the auto-calibration apparatus  10  in  FIG. 1 . The storage unit  301  may be further used to store the calibration information of the calibration case. In this way, the entire maintaining operation for calibration is transferred to the server side, and there are much lower requirements on computing power of the vehicle side and the requester side. Because the auto-calibration server  30  may serve not only one type of vehicle, overall costs may be reduced, and no device such as an extra operator terminal or a low-frequency trigger is needed on the vehicle side. 
     The communication unit  302  of the auto-calibration server  30  is configured to extract a calibration case, and send a target position related to a calibration case to a requester side (such as the auto-calibration apparatus  10  in  FIG. 1 ). Calibration at the target position in the calibration case may be carried out according to  FIG. 1  and a corresponding example. In addition, the communication unit  302  is further configured to receive the calibration information from the vehicle side (such as the auto-calibration device  20  shown in  FIG. 2 ). Generation of the calibration information may be carried out according to  FIG. 2  and a corresponding example, where the calibration information includes the position and angle information of the requester side and the measurement value of the beacon signal used for calibration. This facilitates traceback of historical data, and can perform simulation tests on calibration data, thereby greatly improving calibration efficiency. 
     In some embodiments of the invention, the auto-calibration server  30  further includes an update unit (not shown), where the update unit is configured to update and maintain the calibration case stored in the storage unit  301 . For example, the update unit deletes, adds, or modifies one or some of calibration positions, such that a calibration result reflects actual usage better. Even if the calibration encounters a problem, the update unit may be used to remotely modify a path and adjust a data collection procedure. In addition, this facilitates creating of a calibration database across projects and vehicle types, thereby benefiting subsequent upgrading and optimization. 
       FIG. 5  shows an auto-calibration system  50  according to the invention. The auto-calibration system  50  includes the auto-calibration apparatus  10  in  FIG. 1 , the auto-calibration device  20  in  FIG. 2 , and the auto-calibration server  30  in  FIG. 3 , where various parts of the auto-calibration system  50  can communicate with one another. Although a two-way communication path is shown for each part in the figure, certainly, in some examples, a one-way communication path is enough for achieving the purpose of the invention. 
       FIG. 4  shows an auto-calibration method according to an embodiment of the invention. For clear description the principle of the invention, in  FIG. 4 , auto-calibration methods for different entities (that is, a requester side, a vehicle side, and a server side) are described in one method, but after reading the present application, those skilled in the art will understand that the auto-calibration methods for the different entities may be independently performed. 
     According to another aspect of the invention, an auto-calibration method using a calibration apparatus (a requester side) is provided. As shown in  FIG. 4 , the auto-calibration method includes the following steps. In step S 401 , a target position from a server side is received, and a current position of the calibration apparatus is determined; in step S 402 , a driving signal is generated based on the target position and the current position; in step S 403 , the calibration apparatus is moved to the target position based on the driving signal; and in step S 405 , a beacon signal used for calibration is broadcast. 
     In the auto-calibration method, in step S 401 , the target position (generated in step S 421 , where a dotted line with an arrow in the figure indicates a source, which is the same below) from the server side is received, and the current position of the calibration apparatus is determined. In some examples, the target position received by the calibration apparatus may include only one specific position. In this case, to implement a calibration operation, the calibration apparatus needs to repeat the step of receiving the target position a plurality of times. In some examples, the target position received by the calibration apparatus may include a plurality of positions. The calibration apparatus can traverse the positions in a specific logical order, to complete the calibration operation. If the target position received by the calibration apparatus includes a plurality of positions, it can be considered that a calibration case or a complete calibration task is received. Compared with conventional manual calibration, the calibration apparatus can measure more positions, and efficiency thereof is also greatly improved. In some examples, the target position is not limited to two-dimensional/three-dimensional spatial coordinates, and may further include angle information based on requirements. 
     The current position determined in step S 401  means position information at a moment of measurement, and the position information is not limited to two-dimensional/three-dimensional spatial coordinates either, and may include angle information (for example, a rotation status of the calibration apparatus relative to an initial status) based on requirements. 
     In the auto-calibration method, in step S 402 , the driving signal is generated based on the target position and the current position. The driving signal in the example of the invention is used to enable a power apparatus to form a moving path from the current position to the target position. Compared with a conventional calibration solution, the calibration apparatus in the present application has a much lower requirement on computing power, and a difficulty of developing software and hardware is significantly lowered. 
     In the auto-calibration method, in step S 403 , the calibration apparatus is moved to the target position based on the driving signal. The driving signal may include control instructions that are sent to drivers of, for example, various electric motors, such that a power apparatus such as an electric motor is triggered to transfer the calibration apparatus from the current position to the target position based on the driving signal. 
     In some embodiments of the invention, moving to the target position in step S 403  includes: moving on a calibration plane, and moving in a calibration vertical direction and extend or retract at a set angle. In this way, the auto-calibration method in some examples of the present application can implement a particular trajectory that cannot be implemented in a conventional solution, for example, in-situ spinning, longitudinal spinning, curvy retraction, figure-eight pattern reciprocation, etc. 
     In the auto-calibration method, in step S 405 , the beacon signal used for calibration is broadcast. For example, in step S 405 , the beacon signal may be broadcast at least at the target position. In step S 403 , after, for example, a beacon unit is driven to the target position, an arrival notification may be sent to the beacon unit, and then the beacon unit may broadcast the beacon signal at the target position based on the notification. In another example, in step S 405 , the beacon signal may alternatively be broadcast at any position (where the current position and the target position are included) in a process of moving from the current position to the target position. For example, an actual PEPS part such as an automobile key or a mobile phone may be used to transmit a beacon signal, where the beacon signal is a PEPS working signal sent when the automobile key or the mobile phone works. Generally, the beacon signal has a fixed level characteristic. In some embodiments of the invention, the beacon signal may be a Bluetooth signal, an ultra-wideband signal, a radio frequency signal, etc. The calibration apparatus in the example of the invention may calibrate a vehicle that supports these types of signals. 
     In some embodiments of the invention, the auto-calibration method further includes step S 404  (a dashed box in the figure): An acquisition instruction is sent after the calibration apparatus reaches the target position, where the acquisition instruction includes position and angle information of the current position and an indication of requesting to acquire a signal, and may be received in step S 411  shown in the figure. 
     In some embodiments of the invention, the auto-calibration method further includes step S 406  (a dashed box in the figure): An end instruction is sent after a preset time is passed since the acquisition instruction is sent, where the end instruction includes an indication of requesting to end acquisition of a signal. The preset time may be preset duration for signal acquisition, and the end instruction may be received in step S 413  shown in the figure. 
     According to another aspect of the invention, an auto-calibration method is provided. As shown in  FIG. 4 , the auto-calibration method includes the following steps. In step S 411 , an acquisition instruction from a requester side is received, where the acquisition instruction includes position and angle information of a current position of the requester side and an indication of requesting to acquire a signal. An auto-calibration device, etc. performs a calibration operation based on the information and the indication. In step S 412 , a beacon signal from the requester side is received and measurement is performed to generate a measurement value. In step S 413 , an end instruction from the requester side is received, where the end instruction includes an indication of requesting to end acquisition of a signal. An auto-calibration device, etc. suspends a calibration operation based on the indication. In step S 414 , calibration information is generated based on the measurement value and the position and angle information in the acquisition instruction. In step S 415 , the calibration information is sent to a server side (and is received in step S 422 ). 
     In the auto-calibration method, in step S 412 , the beacon signal from the requester side is received and measurement is performed to generate the measurement value. Based on a difference between beacon signals, there are different types of measurement values. In some embodiments of the invention, the beacon signal may be a Bluetooth signal or an ultra-wideband signal. Correspondingly, the measurement value is a signal strength indication of the Bluetooth signal or a distance value of the ultra-wideband signal. 
     In the auto-calibration method, in step S 414 , the calibration information is generated based on the measurement value and the position and angle information in the acquisition instruction, where the calibration information includes a mapping relationship between the measurement value and the position and angle information in the acquisition instruction. In some examples of the invention, in step S 414 , a time stamp may alternatively be given to the calibration information for subsequent processing. 
     According to another aspect of the invention, an auto-calibration method is provided. As shown in  FIG. 4 , the auto-calibration method includes the following steps. In step S 421 , a calibration case is extracted, and a target position related to the calibration case is sent to the requester side. The calibration case may be associated with a vehicle type, or may be associated with different interior and exterior decorations of the vehicle type. The calibration case includes information used to indicate, for example, various positions where calibration is performed by the auto-calibration apparatus  10  in  FIG. 1 . In this way, the entire maintaining operation for calibration is transferred to the server side, and there are much lower requirements on computing power of the vehicle side and the requester side. Because the server side may serve not only one type of vehicle, overall costs may be reduced, and no device such as an extra operator terminal or a low-frequency trigger is needed on the vehicle side. 
     In the auto-calibration method, in step S 422 , the calibration information of the calibration case is received from the vehicle side, where the calibration information includes position and angle information of the requester side and a measurement value of a beacon signal used for calibration. This facilitates traceback of historical data, and can perform simulation tests on calibration data, thereby greatly improving calibration efficiency. 
     In some embodiments of the invention, the auto-calibration method further includes: The calibration case is updated and maintained. For example, in this step, an update unit may delete, add, or modify one or some of calibration positions, such that a calibration result reflects actual usage better. Even if the calibration encounters a problem, a path may be remotely modified, and a data collection procedure may be adjusted. In addition, this facilitates creating of a calibration database across projects and vehicle types, thereby benefiting subsequent upgrading and optimization. 
     According to another aspect of the invention, a computer-readable storage medium is provided, where the computer-readable storage medium stores instructions, and the instructions, when executed by a processor, cause the processor to perform any one of the foregoing methods. The computer-readable storage medium in the invention includes various computer storage media, and may be any usable medium accessible to a general-purpose or special-purpose computer. For example, the computer-readable storage medium may include a RAM, a ROM, an EPROM, an EEPROM, a register, a hard disk, a removable hard disk, a CD-ROM or another optical memory, a magnetic disk memory or another magnetic storage device, or any other transitory or non-transitory media that can carry or store expected program code having an instruction or data structure form and be accessible to the general-purpose or special-purpose computer or a general-purpose or special-purpose processor. As used in this specification, a disk and a disc includes a compact disc (CD), a laser disc, an optical disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, where data is usually copied magnetically in a disk, and data is usually copied optically by using lasers in a disc. A combination thereof shall also fall within the protection scope of computer-readable media. For example, the storage medium is coupled to a processor, so that the processor can read data from and write data to the storage medium. In an alternative solution, the storage medium may be integrated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative solution, the processor and the storage medium may reside as discrete assemblies in a user terminal. 
     The foregoing examples mainly describe the auto-calibration apparatus, device, and server, the auto-calibration method, and the storage medium of the invention. Although only some embodiments of the invention are described, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms without departing from the essence and scope thereof. Accordingly, the presented examples and implementations are considered to be illustrative rather than restrictive, and the invention may encompass various modifications and replacements without departing from the spirit and scope of the invention that are defined by the appended claims.