JP7431898B2 - Communication terminal, program, and positioning control method - Google Patents

Description

The present invention relates to a communication terminal, a program, and a positioning control method.

Patent Document 1 describes a SBAS (Satellite-Based Augmentation System) correction technique. Patent Document 2 describes a reinforcement method using correction information using quasi-zenith satellites and geostationary satellites. Patent Document 3 describes a multi-GNSS (Global Navigation Satellite System) positioning technology.
[Prior art documents]
[Patent document]
[Patent Document 1] Japanese Patent Application Publication No. 2014-238349 [Patent Document 2] Japanese Patent Application Publication No. 2014-206502 [Patent Document 3] Japanese Patent Application Publication No. 2019-086300

According to one embodiment of the present invention, a communication terminal is provided. The communication terminal may include a positioning execution unit capable of performing GNSS positioning and SBAS correction. The communication terminal controls the positioning execution unit not to perform the SBAS correction when a predetermined condition is met, and controls the positioning execution unit to perform the positioning when the predetermined condition is not met. The positioning control unit may include a positioning control unit that controls the unit to execute the SBAS correction.

In the communication terminal, the positioning control unit controls the positioning execution unit not to perform the SBAS correction when the positioning result of the GNSS positioning performed by the positioning execution unit satisfies a predetermined condition. However, when the positioning result does not satisfy the predetermined condition, the positioning execution unit may be controlled to execute the SBAS correction. The positioning control unit is configured such that the positioning execution unit starts receiving the GNSS signal and the SBAS signal, and the positioning result of the GNSS positioning performed using the GNSS signal whose reception has been completed satisfies the predetermined conditions. If the condition is not satisfied, the positioning execution unit may interrupt reception of the SBAS signal. The positioning control unit controls the positioning execution unit not to perform the SBAS correction when the positioning accuracy of the GNSS positioning satisfies a predetermined condition, and when the positioning accuracy satisfies the predetermined condition. If the condition is not satisfied, the positioning execution unit may be controlled to execute the SBAS correction. The positioning control unit controls the positioning execution unit not to perform the SBAS correction when the positioning accuracy is higher than the predetermined threshold, and when the positioning accuracy is lower than the predetermined threshold. , the positioning execution unit may be controlled to execute the SBAS correction. The positioning control unit controls the positioning execution unit not to perform the SBAS correction when the positioning accuracy is lower than a predetermined threshold, and controls the positioning execution unit not to perform the SBAS correction when the positioning accuracy is higher than the predetermined threshold. , the positioning execution unit may be controlled to execute the SBAS correction.

In any of the communication terminals, the positioning control unit controls the positioning execution unit not to perform the SBAS correction when the C/N ratio of the GNSS positioning is lower than a predetermined threshold; When the C/N ratio is higher than the predetermined threshold value, the positioning execution unit may be controlled to execute the SBAS correction.

In any of the communication terminals, the positioning control unit determines whether to cause the positioning execution unit to execute the SBAS correction based on the number of satellites detected when the positioning execution unit executes the GNSS positioning. may be controlled.

In any of the communication terminals, when the positioning execution unit executes AGNSS positioning, the positioning control unit causes the positioning execution unit to perform the SBAS correction based on Ephemeris information regarding the position of the satellite provided in advance. You may control whether or not it is executed.

In any of the communication terminals, the positioning control unit controls the positioning execution unit not to perform the SBAS correction when the position indicated by the positioning result is located within a predetermined area; When the position indicated by the positioning result is not located within the predetermined area, the positioning execution unit may be controlled to execute the SBAS correction. The predetermined areas include areas registered as areas that are likely to be out of range of SBAS signals, areas outside the SBAS support area, and areas where the elevation angle of the SBAS satellite is lower than a predetermined angle. It may be at least one of the areas.

Any of the communication terminals may include a location information storage section that stores location information of the communication terminal specified by the positioning performed by the positioning execution section, and the positioning control section stores the location information stored in the location information storage section. If it is determined that the communication terminal is located within a predetermined area based on the history of the location information, the positioning execution unit is controlled not to perform the SBAS correction, and If it is determined that the location is not within the area, the positioning execution unit may be controlled to execute the SBAS correction. When the positioning control unit determines that the communication terminal is located within the predetermined area based on the history of the position information stored in the position information storage unit, the positioning execution unit: Control may be performed so as not to perform SBAS signal reception processing.

Any of the communication terminals may further include a mobile communication unit that performs mobile communication by wirelessly communicating with a radio base station, and the positioning control unit may be configured such that the mobile communication unit performs mobile communication from the radio base station. Based on the received base station related information related to the wireless base station, it may be determined whether or not to cause the positioning execution unit to execute the SBAS correction. The base station related information may include base station identification information that can identify the wireless base station, and the positioning control unit may identify the wireless base station identified by the base station identification information received by the mobile communication unit. If the station is a pre-registered wireless base station, the positioning execution unit may be controlled not to execute the SBAS correction. When the base station identification information received by the mobile communication unit is included in the registration data including a plurality of base station identification information received from the server in advance, the positioning control unit causes the positioning execution unit to transmit the SBAS to the base station identification information. It may be controlled so that the correction is not executed. The communication terminal stores success or failure of the SBAS correction by the positioning execution unit when the communication terminal is located in the wireless base station in association with base station identification information of the wireless base station. The positioning control unit may further include a storage unit and a specification unit that specifies the success rate of SBAS correction for each of the plurality of radio base stations based on the information stored in the success/failure storage unit, and the positioning control unit If the success rate of the SBAS correction of the wireless base station identified by the base station identification information received by the mobile communication unit is lower than a predetermined threshold, the positioning execution unit executes the SBAS correction. You can control it so that it doesn't happen.

According to one embodiment of the present invention, a program for causing a computer to function as the location management terminal is provided.

According to one embodiment of the present invention, a positioning control method is provided. The positioning control method may be executed by a communication terminal including a positioning execution unit capable of performing GNSS positioning and SBAS correction. The positioning control method controls the positioning execution unit not to perform the SBAS correction when a predetermined condition is met, and controls the positioning execution unit to not perform the SBAS correction when the predetermined condition is not met. The method may include a positioning control step for controlling the execution unit to execute the SBAS correction.

Note that the above summary of the invention does not list all the necessary features of the invention. Furthermore, subcombinations of these features may also constitute inventions.

1 schematically depicts an example of a system 10; 3 is an explanatory diagram for explaining positioning processing of the communication terminal 100. FIG. An example of the functional configuration of the communication terminal 100 is schematically shown. An example of the flow of processing by the communication terminal 100 is schematically shown. An example of the flow of processing by the communication terminal 100 is schematically shown. An example of the hardware configuration of a computer 1200 functioning as the communication terminal 100 is schematically shown.

In conventional SBAS correction techniques, correction calculations are performed after normal satellite positioning is completed. If the reception of the radio wave signal necessary for correction has not been completed, the SBAS correction calculation is performed after the reception of the radio wave signal is completed. Since the period during which the chip is active for receiving radio wave signals and performing SBAS calculations is extended, there are concerns about battery consumption during this period. The communication terminal 100 according to the present embodiment has an SBAS correction function, but for example, when a specific condition is met, SBAS signal reception is interrupted and SBAS correction processing is not performed, thereby reducing power consumption. Contribute to the reduction of

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Furthermore, not all combinations of features described in the embodiments are essential to the solution of the invention.

FIG. 1 schematically depicts an example of a system 10. The system 10 includes a communication terminal 100 and a server 200.

Communication terminal 100 is a terminal that can perform positioning processing. The communication terminal 100 may be capable of performing GNSS positioning such as GPS (Global Positioning System) positioning. The GNSS positioning performed by the communication terminal 100 may include AGNSS (Assisted GNSS) positioning. Communication terminal 100 may be able to perform SBAS correction.

Communication terminal 100 receives GNSS signals 22 from multiple satellites 20 and executes GNSS positioning processing. Communication terminal 100 receives SBAS signal 38 from control station 32 via satellite 36 and performs SBAS correction. The control station 32 monitors errors, abnormalities, etc. in the GNSS signal 22 from the satellite 20 using a plurality of monitoring stations 34 located in various places, and transmits the SBAS signal 38 including error correction information and abnormality information to the satellite 36. is provided to the communication terminal 100 via.

SBAS may be MSAS (MTSAT Satellite-based Augmentation System) in Japan. SBAS may be WAAS (Wide Area Augmentation System) in the United States. SBAS may be EGNOS (European Geostationary-Satellite Navigation Overlay Service) in Europe. SBAS may be GAGAN (GPS Aided Geo Augmented Navigation) in India.

Note that the communication terminal 100 may be capable of performing NW (NetWork) positioning. Examples of NW positioning include cell positioning, Wi-Fi (registered trademark) (Wireless Fidelity) positioning, and the like.

The communication terminal 100 may be, for example, a location management terminal that allows the server 200 to manage location information of a user who owns the communication terminal 100. The location management terminal is sometimes called a GPS tracker or the like. Further, the communication terminal 100 is, for example, a smartphone. Communication terminal 100 may be a tablet terminal. Communication terminal 100 may be a wearable terminal.

Communication terminal 100 executes processing for reporting position information to server 200 based on predetermined conditions for executing positioning processing. The condition for executing the positioning process may be, for example, a predetermined time interval. Specifically, for example, communication terminal 100 may execute processing for reporting location information to server 200 at predetermined intervals. Furthermore, the condition for executing the positioning process may be, for example, that the output of a sensor such as an acceleration sensor mounted on the communication terminal 100 satisfies the condition for executing the positioning process. Specifically, for example, when the communication terminal 100 detects movement/standstill of the own device based on the output of a sensor such as an acceleration sensor mounted on the own device, the communication terminal 100 performs processing for reporting position information to the server 200. May be executed. Furthermore, the conditions for executing the positioning process may be a combination of multiple conditions. Specifically, for example, the communication terminal 100 detects the movement/standstill of the own device at predetermined intervals based on the output of a sensor such as an acceleration sensor mounted on the own device, and detects whether the own device is moving or not. , a process for reporting location information to the server 200 may be executed. Note that the conditions for executing the positioning process described above are only an example, and are not limited to the above example. For example, the conditions for executing the positioning process include when the communication terminal 100 receives a predetermined operation, or when the location information management terminal receives a signal requesting a report of location information from another communication terminal 100 or the server 200, etc. It may be.

Communication terminal 100 may be capable of performing mobile communication. Communication terminal 100 accesses network 50 via a wireless base station, for example. Communication terminal 100 may access network 50 via a Wi-Fi access point. Network 50 includes a mobile communications network. Network 50 may include the Internet. Communication terminal 100 communicates with server 200 via network 50.

The server 200 may manage location information of the communication terminal 100. For example, the server 200 provides location information of the communication terminal 100 in response to a request from an authenticated device. For example, a parent allows a child to carry the communication terminal 100, accesses the server 200 using an application installed on his or her smartphone, and confirms the location information of the communication terminal 100.

The server 200 may manage the execution status of SBAS correction by the communication terminal 100. For example, the server 200 collects the execution results of the SBAS correction by the communication terminal 100 and identifies the success rate of the SBAS correction in each region.

The communication terminal 100 according to the present embodiment achieves reduction in power consumption by not performing SBAS correction when specific conditions are met.

FIG. 2 is an explanatory diagram for explaining positioning processing of the communication terminal 100. In one example, the communication terminal 100 starts receiving GNSS signals and SBAS signals in response to conditions for performing positioning processing being met. Normally, it takes a longer time to receive an SBAS signal than it takes to receive a GNSS signal. Although FIG. 2 shows an example in which the communication terminal 100 starts receiving the GNSS signal and the SBAS signal at the same time, the GNSS signal and the SBAS signal do not have to be received at the same time. For example, the GNSS signal may be received first, and after the GNSS signal reception is completed, the SBAS signal reception may be started.

When the reception of the GNSS signal is completed, the communication terminal 100 executes a GNSS positioning process using the received GNSS signal. Then, when the reception of the SBAS signal is completed, the communication terminal 100 executes the SBAS correction process, that is, corrects the processing result of the GNSS positioning process according to the SBAS signal.

In conventional SBAS correction technology, if SBAS signal reception has not been completed when GNSS positioning processing is completed, SBAS correction processing is performed after waiting for the completion of SBAS signal reception. As a result, the time for consuming power for SBAS signal reception and SBAS correction processing is extended. Therefore, the communication terminal 100 according to the present embodiment does not perform the SBAS correction when a predetermined condition is satisfied.

As a specific example, the communication terminal 100 is equipped with a GNSS chip that can perform GNSS positioning and SBAS correction, and the control unit of the communication terminal 100 issues instructions to the GNSS chip to perform GNSS positioning and SBAS correction. Control execution. The control unit of the communication terminal 100 instructs the GNSS chip to start the positioning process, for example, in response to the conditions for executing the positioning process being met. For example, when the GNSS positioning by the GNSS chip is completed, the control unit of the communication terminal 100 acquires the positioning accuracy of the GNSS positioning from the GNSS chip, and controls whether or not to perform SBAS correction according to the positioning accuracy. do. For example, the control unit of the communication terminal 100 obtains a C/N (Carrier/Noise) ratio from the GNSS chip when GNSS positioning using the GNSS chip is completed, and performs SBAS correction according to the C/N ratio. Control whether to execute or not. The C/N ratio is a value indicating radio wave communication quality that changes due to reflection of GNSS signals 22 received from a plurality of satellites 20, etc. For example, when the GNSS positioning by the GNSS chip is completed, the control unit of the communication terminal 100 acquires the positioning result from the GNSS chip, and controls whether or not to perform SBAS correction depending on the position indicated by the positioning result. do.

Here, even if the value of the C/N ratio is good, the positioning accuracy may be low. Specifically, for example, when the number of detected satellites is small or when the positions of detected satellites are uneven, positioning accuracy may be low even if the C/N ratio value is good. There is. Therefore, when determining positioning accuracy based on the C/N ratio and controlling whether to perform SBAS correction, power consumption may not be sufficiently reduced in some cases. Therefore, the communication terminal 100 may control whether to perform the SBAS correction based on information other than the C/N ratio as the positioning accuracy. For example, the communication terminal 100 may control whether or not to perform SBAS correction based on the number of detected satellites as the positioning accuracy. As a specific example, if the number of detected satellites is less than a predetermined number, the communication terminal 100 is controlled not to perform the SBAS correction, and if it is large, the communication terminal 100 is controlled to perform the SBAS correction. Furthermore, for example, the communication terminal 100 may control whether to perform SBAS correction based on Ephemeris information, which is information indicating the approximate position of a satellite provided in advance by AGNSS, as the positioning accuracy. As a specific example, if the communication terminal 100 determines based on Ephemeris information that there is no satellite located close to the SBAS satellite, it controls not to perform SBAS correction, and if it determines that there is a satellite located close to the SBAS satellite. , controls to execute SBAS correction. Note that the above example is an example of a process for controlling whether or not to perform SBAS correction based on positioning accuracy, and is not limited to these examples. For example, the communication terminal 100 performs SBAS correction as positioning accuracy based on the C/N ratio, the number of detected satellites, and Ephemeris information that is information indicating the approximate position of the satellite provided in advance by AGNSS. You can control whether it is executed or not.

For example, when the GNSS positioning is completed and the positioning accuracy of the GNSS positioning is higher than a predetermined threshold, the communication terminal 100 does not continue receiving the SBAS signal and does not perform the SBAS correction. As a specific example, the control unit of the communication terminal 100 compares the positioning accuracy of GNSS positioning acquired from the GNSS chip with a predetermined threshold, and when the positioning accuracy is higher than the threshold, the control unit instructs the GNSS chip to receive the SBAS signal. to stop. This makes it possible to appropriately reduce power consumption in use cases where higher accuracy is not required when the positioning accuracy of GNSS positioning is good.

For example, when the GNSS positioning is completed and the positioning accuracy of the GNSS positioning is lower than a predetermined threshold, the communication terminal 100 does not continue receiving the SBAS signal and does not perform the SBAS correction. As a specific example, the control unit of the communication terminal 100 compares the positioning accuracy of the GNSS positioning acquired from the GNSS chip with a predetermined threshold, and if the positioning accuracy is lower than the threshold, the control unit controls the GNSS chip to receive the SBAS signal. to stop. If the positioning accuracy of GNSS positioning is poor, SBAS correction may also take time or may be prone to failure. In addition, when the positioning accuracy of GNSS positioning is poor, for example, when an error of about 300 m has occurred, even if the SBAS correction is corrected by about 5 m, the effect of the correction is small, and it is difficult to see the difference numerically or visually on the map. It can be said that it is difficult to convey the effect of the correction. Therefore, by not performing SBAS correction when the positioning accuracy of GNSS positioning is poor, it is possible to reduce the possibility of consuming power even though the effect of SBAS correction is small or cannot be expected.

When the GNSS positioning is completed, the communication terminal 100 determines whether the positioning accuracy of the GNSS positioning is higher than a predetermined first threshold or lower than a second threshold that is lower than the first threshold. , SBAS correction is not performed without continuing SBAS signal reception, and when the positioning accuracy of GNSS positioning is between the first threshold and the second threshold, SBAS signal reception is continued and SBAS Correction may also be performed. This makes it possible to obtain both of the effects described above.

For example, at the time when GNSS positioning is completed, if the C/N ratio in GNSS positioning is lower than a predetermined threshold, the communication terminal 100 does not continue receiving SBAS signals and does not perform SBAS correction. do. As a specific example, the control unit of the communication terminal 100 compares the C/N ratio acquired from the GNSS chip with a predetermined threshold, and if the C/N ratio is lower than the threshold, the control unit of the communication terminal 100 transmits the SBAS signal to the GNSS chip. Stop reception. If the C/N ratio is lower than the threshold, there is a high possibility that the success rate of receiving the SBAS signal will also decrease. Therefore, by not performing SBAS correction when the C/N ratio of GNSS positioning is poor, it is possible to reduce the possibility of consuming power even though there is a high possibility that SBAS correction will fail. can.

For example, if the communication terminal 100 is located in an area that is likely to be out of range of the SBAS signal, an area outside the SBAS support area, an area where the elevation angle of the satellite 36 is lower than a predetermined angle, etc. SBAS correction is not performed. For example, the satellite 36 in MSAS is a geostationary satellite, and the area where it is difficult to receive the SBAS signal is difficult to change. For example, even if the satellite 36 is not a geostationary satellite, the flight path of the satellite 36 is fixed, so it is possible to identify areas where it is difficult to receive SBAS signals. For example, when the position indicated by the positioning result of the GNSS positioning process is located within these areas, the communication terminal 100 does not continue receiving the SBAS signal and does not perform the SBAS correction. This can reduce the possibility of unnecessary power consumption in a situation where SBAS correction fails as a result. If the communication terminal 100 determines that the communication terminal 100 is located within such an area before starting the positioning process, the communication terminal 100 may not perform any SBAS-related processing including SBAS signal reception in the first place. Thereby, the power saving effect can be further enhanced.

FIG. 3 schematically shows an example of the functional configuration of the communication terminal 100. The communication terminal 100 includes a storage section 110, a positioning execution section 120, a positioning control section 130, a mobile communication section 140, a server communication section 150, and a specifying section 160. Note that it is not essential that the communication terminal 100 include all of these.

The storage unit 110 stores various information. The storage unit 110 may include a location information storage unit 112, an area information storage unit 114, a registration data storage unit 116, and a success/failure storage unit 118.

The positioning execution unit 120 executes positioning processing. The positioning execution unit 120 causes the position information storage unit 112 to store the position information of the communication terminal 100, which is the positioning result.

The positioning execution unit 120 can perform GNSS positioning and SBAS correction. The positioning execution unit 120 receives GNSS signals from a plurality of satellites 20 and executes GNSS positioning processing. The positioning execution unit 120 receives the SBAS signal from the control station 32 via the satellite 36 and executes SBAS correction.

The positioning execution unit 120 executes a positioning process, for example, according to an instruction from a user of the communication terminal 100. The positioning execution unit 120 executes positioning processing, for example, in response to satisfaction of a predetermined condition. The positioning execution unit 120 executes positioning processing at each predetermined timing, for example. For example, the positioning execution unit 120 detects movement/standstill of the communication terminal 100 based on the output of a sensor such as an acceleration sensor mounted on the communication terminal 100 at predetermined intervals, and performs positioning when the communication terminal 100 is moving. Execute processing. The positioning execution unit 120 may execute the positioning process at predetermined time intervals without detecting movement/stationarity.

When performing positioning processing, the positioning execution unit 120 may first start receiving GNSS signals and receiving SBAS signals. The positioning execution unit 120 may execute the GNSS positioning process as soon as the reception of the GNSS signal is completed, and may execute the SBAS correction as soon as the reception of the SBAS signal is completed.

A timeout period may be set for the reception of the GNSS signal by the positioning execution unit 120. The positioning execution unit 120 may stop receiving the signal if the reception of the signal is not completed by the time a preset timeout period elapses after starting the reception of the GNSS signal. The timeout period may be arbitrarily settable or changeable. The positioning execution unit 120 sets a timeout time, for example, according to an instruction from a user of the communication terminal 100.

A timeout period may be set for the reception of the SBAS signal by the positioning execution unit 120. The positioning execution unit 120 may stop receiving the signal if the reception of the signal is not completed before a preset timeout period elapses after starting the reception of the SBAS signal. The timeout period may be arbitrarily settable or changeable. The positioning execution unit 120 sets a timeout time, for example, according to an instruction from a user of the communication terminal 100.

The positioning control unit 130 controls positioning by the positioning execution unit 120. For example, the positioning control unit 130 controls the positioning execution unit 120 not to perform SBAS correction when a predetermined condition is satisfied.

For example, when the positioning result of the GNSS positioning performed by the positioning execution unit 120 satisfies a predetermined condition, the positioning control unit 130 controls the positioning execution unit 120 not to perform SBAS correction, and the positioning result is If the condition is not met, the positioning execution unit 120 is controlled to execute SBAS correction. Thereby, for example, when it can be determined based on the positioning results of GNSS positioning that the situation is such that power saving should be prioritized over execution of SBAS correction, it is possible to reduce power consumption without executing SBAS correction.

For example, when the positioning execution unit 120 starts receiving a GNSS signal and an SBAS signal, and the positioning result of the GNSS positioning performed using the GNSS signal that has been received does not satisfy the conditions, the positioning control unit 130 performs the positioning The execution unit 120 is caused to interrupt reception of the SBAS signal. This can eliminate the consumption of power necessary to continue receiving SBAS signals, contributing to power saving.

For example, the positioning control unit 130 controls the positioning execution unit 120 not to perform SBAS correction when the positioning accuracy of GNSS positioning satisfies a predetermined condition, and when the positioning accuracy does not satisfy the condition, The positioning execution unit 120 is controlled to execute SBAS correction.

For example, the positioning control unit 130 controls the positioning execution unit 120 not to perform SBAS correction when the positioning accuracy is higher than a predetermined threshold, and when the positioning accuracy is lower than the threshold, the positioning execution unit 120 control to execute SBAS correction. This makes it possible to appropriately reduce power consumption in use cases where higher accuracy is not required when the positioning accuracy of GNSS positioning is good. Note that the threshold value may be arbitrarily set or changeable.

For example, the positioning control unit 130 controls the positioning execution unit 120 not to perform SBAS correction when the positioning accuracy is lower than a predetermined threshold, and when the positioning accuracy is higher than the threshold, the positioning execution unit 120 control to execute SBAS correction. Thereby, it is possible to reduce the possibility that power is consumed even though the effect of SBAS correction is small or cannot be expected. Note that the threshold value may be arbitrarily set or changeable.

For example, when the positioning control unit 130 completes the GNSS positioning, the positioning accuracy of the GNSS positioning is higher than a predetermined first threshold, or lower than a second threshold that is lower than the first threshold. If the positioning accuracy of the GNSS positioning is between the first threshold value and the second threshold value, the positioning execution unit 120 is controlled not to perform the SBAS correction. control to execute. The first threshold and the second threshold may be arbitrarily set or changeable as long as the first threshold is lower than the second threshold.

For example, the positioning control unit 130 controls the positioning execution unit 120 not to perform SBAS correction when the C/N ratio of GNSS positioning is lower than a predetermined threshold, and when the C/N ratio is higher than the threshold. In this case, the positioning execution unit 120 is controlled to execute the SBAS correction. As a result, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, resulting in power savings. I can contribute. Note that the threshold value may be arbitrarily set or changeable.

For example, the positioning control unit 130 controls whether or not to cause the positioning execution unit 120 to perform SBAS correction based on the number of satellites detected when the positioning execution unit 120 executes GNSS positioning. For example, if the number of satellites detected by the positioning execution unit 120 is less than a predetermined number, the positioning control unit 130 controls the SBAS correction not to be performed, and if the number is large, the positioning control unit 130 controls the SBAS correction to be performed. do. As a result, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, resulting in power savings. I can contribute. Note that the predetermined number may be arbitrarily set or changeable.

For example, when the positioning execution unit 120 executes AGNSS positioning, the positioning control unit 130 controls whether or not the positioning execution unit 120 executes SBAS correction based on Ephemeris information regarding the position of the satellite provided in advance. do. For example, if the positioning control unit 130 determines based on the Ephemeris information that there is no satellite located close to the SBAS satellite, it controls the SBAS correction not to be performed, and if it determines that there is a satellite located close to the SBAS satellite, Control is performed to execute SBAS correction. As a result, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, resulting in power savings. I can contribute.

For example, the positioning control unit 130 determines whether or not to cause the positioning execution unit 120 to perform SBAS correction based on the position indicated by the positioning result of the GNSS positioning performed by the positioning execution unit 120. For example, the positioning control unit 130 causes the positioning execution unit 120 to perform the SBAS correction when the position indicated by the positioning result is located within a predetermined area (sometimes referred to as an SBAS correction non-execution area). If the position indicated by the positioning result is not within the SBAS correction non-execution area, the positioning execution unit 120 is controlled to execute the SBAS correction. Information on the SBAS non-execution area may be stored in advance in the area information storage unit 114, and the positioning control unit 130 may refer to the area information storage unit 114. The SBAS correction non-execution area may be an area registered as an area that is likely to be outside the coverage area of the SBAS signal. The SBAS correction non-execution area may be an area outside the SBAS support area. The SBAS correction non-execution area may be an area where the elevation angle of the satellite 36 is lower than a predetermined angle. As a result, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, resulting in power savings. I can contribute.

The positioning control unit 130 may determine whether to cause the positioning execution unit 120 to perform the SBAS correction based on the history of the position information of the communication terminal 100 stored in the position information storage unit 112. For example, the positioning control unit 130 executes positioning when determining that the communication terminal 100 is located within the SBAS correction non-execution area based on the history of the position information of the communication terminal 100 stored in the position information storage unit 112. If the position indicated by the positioning result is not within the SBAS correction non-execution area, the positioning execution unit 120 is controlled to execute the SBAS correction. As a result, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, resulting in power savings. I can contribute. After the positioning execution unit 120 starts receiving the SBAS correction, the positioning control unit 130 determines whether the communication terminal 100 does not perform SBAS correction based on the history of the position information of the communication terminal 100 stored in the position information storage unit 112. If it is determined that the location is within the execution area, the positioning execution unit 120 may interrupt reception of the SBAS correction. When the positioning control unit 130 determines that the communication terminal 100 is located within the SBAS correction non-execution area based on the history of the position information of the communication terminal 100 stored in the position information storage unit 112, the positioning control unit 130 controls the positioning execution unit 120. However, it may be controlled so that the SBAS signal reception processing is not executed. As a result, in a situation where there is a high possibility that the SBAS correction will fail as a result, it is possible to prevent any SBAS related processing including SBAS signal reception from being executed in the first place, and further power saving can be achieved.

Mobile communication unit 140 performs mobile communication. The mobile communication unit 140 may perform mobile communication by wirelessly communicating with a wireless base station.

Server communication unit 150 communicates with server 200 . The server communication unit 150 may communicate with the server 200 via the mobile communication unit 140. For example, the server communication unit 150 transmits the position information stored in the position information storage unit 112 to the server 200. The server communication unit 150 receives information on the SBAS non-execution area from the server 200, for example, and stores it in the area information storage unit 114.

The positioning control unit 130 may acquire, from the mobile communication unit 140, base station related information related to the wireless base station that the mobile communication unit 140 has received from the wireless base station. The base station related information may be included in broadcast information broadcast by a wireless base station. The base station related information may include PLMN (Public Land Mobile Network). The base station related information may include base station identification information that can identify the wireless base station. The base station related information may include cell identification information. The positioning control unit 130 may determine whether to cause the positioning execution unit 120 to perform SBAS correction based on the base station related information. Note that the mobile communication unit 140 only needs to be able to receive a wireless signal arriving from a wireless base station. That is, the mobile communication unit 140 does not need to establish a connection with a wireless base station as long as it can receive base station related information.

For example, if the wireless base station identified by the base station identification information received by the mobile communication unit 140 is a pre-registered wireless base station, the positioning control unit 130 does not cause the positioning execution unit 120 to perform the SBAS correction. Control as follows. For example, the server communication unit 150 receives registration data in advance from the server 200 that includes identification information of a plurality of base stations to which SBAS correction is not performed, and stores it in the registration data storage unit 116. For example, the server 200 includes base station identification information of a wireless base station that covers the SBAS correction non-execution area in the registration data. The positioning control unit 130 prevents the positioning execution unit 120 from performing SBAS correction when the base station identification information received by the mobile communication unit 140 is included in the registered data stored in the registered data storage unit 116. Control. As a result, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, resulting in power savings. I can contribute. Note that cell identification information may be used instead of base station identification information.

For example, when the communication terminal 100 is a terminal that receives service from a wireless communication carrier in Japan, the positioning control unit 130 executes positioning when the PLMN or MCC included in the base station related information indicates a location other than Japan. Control unit 120 is controlled not to perform SBAS correction. In the case of a communication terminal 100 that receives service from a wireless communication carrier in Japan, it will use MSAS and receive SBAS signals from satellites in MSAS, but if such a communication terminal 100 is located overseas In this case, there is a high possibility that the reception quality of the SBAS signal is poor or that the SBAS signal cannot be received. Therefore, in situations where there is a high possibility that SBAS correction will fail and, as a result, there is a high possibility that the power required for processing related to SBAS correction will be wasted, it is possible to prevent SBAS correction from being executed, contributing to power savings. can.

The success/failure storage unit 118 stores the success or failure of the SBAS correction by the positioning execution unit 120 when the communication terminal 100 is located in the wireless base station in association with the base station identification information or cell identification information of the wireless base station. do. For example, the success/failure storage unit 118 stores the fact that the SBAS correction was successful and the base station identification information or cell identification information in association with each other when the SBAS correction can be executed without timeout, and when the SBAS correction times out, The fact that SBAS correction has failed is associated with base station identification information or cell identification information and stored.

The identifying unit 160 identifies the success rate of SBAS correction for each of the plurality of wireless base stations based on the information stored in the success/failure storage unit 118. The specifying unit 160 may cause the success/failure storage unit 118 to associate the base station identification information of the plurality of wireless base stations with the success rate of each SBAS correction. When the success rate of SBAS correction of the wireless base station identified by the base station identification information received by the mobile communication unit 140 is lower than a predetermined threshold, the positioning control unit 130 causes the positioning execution unit 120 to perform SBAS correction. may be controlled so that it is not executed. As a result, when the communication terminal 100 is located in a radio base station that is located in an area where the success rate of SBAS correction is low among the radio base stations that it usually uses, it is possible to prevent the execution of SBAS correction, and as a result, the SBAS It is possible to reduce the possibility of unnecessary power consumption in situations where there is a high possibility that correction will fail. Note that cell identification information may be used instead of base station identification information.

The server communication unit 150 may transmit the information stored in the success/failure storage unit 118 to the server 200. The server 200 may collect information from multiple communication terminals 100. The server 200 may generate registration data using information collected from multiple communication terminals 100. The server 200 may use information collected from the plurality of communication terminals 100 to determine the success or failure status of the SBAS correction in each location, and generate information on the SBAS correction non-execution area.

The positioning execution unit 120 may change the timeout period for receiving the SBAS signal based on the base station related information received by the mobile communication unit 140. For example, when the base station identification information received by the mobile communication unit 140 is included in the registration data stored in the registration data storage unit 116, the positioning execution unit 120 shortens the timeout time for receiving the SBAS signal than the default. change. Further, for example, when the PLMN or MCC received by the mobile communication unit 140 indicates a country other than Japan, the positioning execution unit 120 changes the timeout time for receiving the SBAS signal to be shorter than the default. Thereby, in a situation where there is a high possibility that SBAS correction will fail, reception of the SBAS signal can be stopped early, contributing to power saving.

The area information storage unit 114 may store support area information indicating a support area of SBAS. For example, the server communication unit 150 receives support area information from the server 200 and stores it in the area information storage unit 114. The support area information may include information on areas where support is guaranteed by the SBAS provider. The support area information may include information on areas where the success rate of SBAS correction is higher than a predetermined threshold. The information is generated by the server 200, for example. The support area information may include base station identification information of a wireless base station located in an area where the success rate of SBAS correction is high. The information is generated by the server 200, for example.

The positioning execution unit 120 may adjust the timeout period for receiving the SBAS signal based on the location information of the communication terminal 100 and the support area information stored in the area information storage unit 114. For example, if the position indicated by the positioning result of the positioning process executed by the positioning execution unit 120 is located within the area indicated by the support area information, or if the positioning execution unit 120 When the information matches the base station identification information included in the support area information, the timeout period of the SBAS signal is made longer than the default. Thereby, it is possible to reduce the possibility that execution of SBAS correction will be stopped even though the area supports SBAS correction or is likely to succeed in SBAS correction. The positioning execution unit 120 may further adjust the timeout period of GNSS positioning. For example, if the position indicated by the positioning result of the positioning process executed by the positioning execution unit 120 is located within the area indicated by the support area information, or if the positioning execution unit 120 When the information matches the base station identification information included in the support area information, the timeout period for GNSS positioning is made longer than the default. As a specific example, when the default timeout time for GNSS positioning is 60 seconds, the positioning execution unit 120 extends it to 5 minutes. Thereby, it is possible to reduce the possibility that the positioning process will be interrupted midway even though the area supports SBAS correction or is likely to be successful in SBAS correction.

FIG. 4 schematically shows an example of the flow of processing by the communication terminal 100. Here, a state in which the conditions for performing positioning processing are satisfied will be described as a start state.

In step (step may be abbreviated as S) 102, the positioning execution unit 120 starts receiving GNSS signals and SBAS signals. If the reception of the GNSS signal is completed (YES in S104), the process advances to S106. In S106, the positioning execution unit 120 executes GNSS positioning processing using the received GNSS signal.

In S108, the positioning control unit 130 determines whether the positioning result of the GNSS positioning in S106 satisfies the conditions. For example, the positioning control unit 130 determines that the condition is satisfied when the positioning accuracy of GNSS positioning is higher than a predetermined threshold value, and determines that the condition is not satisfied when it is lower. For example, the positioning control unit 130 determines that the condition is satisfied when the positioning accuracy of GNSS positioning is lower than a predetermined threshold value, and determines that the condition is not satisfied when it is higher. For example, the positioning control unit 130 determines that the condition is satisfied when the C/N ratio of GNSS positioning is lower than a predetermined threshold value, and determines that the condition is not satisfied when it is higher. For example, the positioning control unit 130 determines that the condition is satisfied when the position indicated by the positioning result is located within a predetermined area, and determines that the condition is not satisfied when the position is not located. If it is determined that the condition is satisfied, the process proceeds to S110, and if it is determined that the condition is not satisfied, the process proceeds to S112.

In S110, the positioning control unit 130 causes the positioning execution unit 120 to interrupt reception of the SBAS signal. In S112, the positioning execution unit 120 determines whether reception of the SBAS signal is completed. If the reception of the SBAS signal is completed, the process advances to S114. In S114, the positioning execution unit 120 uses the received SBAS signal to correct the positioning result of the GNSS positioning in S106.

In S116, the positioning execution unit 120 outputs the positioning result. The positioning execution unit 120 may display the positioning result on a display included in the communication terminal 100, or transmit and output the positioning result to another device. If the reception of the SBAS signal is interrupted in S110, the positioning execution unit 120 outputs the positioning result of the GNSS positioning process in S106, and if the SBAS correction process is executed in S114, the positioning execution unit 120 outputs the positioning result after the correction. Output.

FIG. 5 schematically shows an example of the flow of processing by the communication terminal 100. Here, a state in which the conditions for performing positioning processing are satisfied will be described as a start state.

In S202, the positioning control unit 130 determines whether the communication terminal 100 is located within the specific area. The specific area may be an SBAS correction non-execution area. For example, the positioning control unit 130 determines whether the communication terminal 100 is located within a specific area based on the history of position information stored in the position information storage unit 112. For example, the positioning control unit 130 determines whether the communication terminal 100 is located within a specific area based on base station related information that the mobile communication unit 140 receives from a wireless base station. If it is determined that it is located, the process advances to S204, and if it is determined that it is not located, the process advances to S210.

In S204, the positioning execution unit 120 starts receiving GNSS signals. At this time, the positioning execution unit 120 does not start receiving the SBAS signal. If the reception of the GNSS signal is completed (YES in S206), the process advances to S208. In S208, the positioning execution unit 120 executes GNSS positioning processing using the received GNSS signal.

In S210, the positioning execution unit 120 starts receiving GNSS signals and SBAS signals. If the reception of the GNSS signal is completed (YES in S212), the process advances to S214. In S214, the positioning execution unit 120 executes GNSS positioning processing using the received GNSS signal.

In S216, the positioning execution unit 120 determines whether reception of the SBAS signal is completed. If the reception of the SBAS signal is completed, the process advances to S218. In S218, the positioning execution unit 120 uses the received SBAS signal to correct the positioning result of the GNSS positioning in S214.

In S220, the positioning execution unit 120 outputs the positioning result. The positioning execution unit 120 may display the positioning result on a display included in the communication terminal 100, or transmit and output the positioning result to another device. When the GNSS positioning process is executed in S208, the positioning execution unit 120 outputs the positioning result of the positioning process, and when the SBAS correction process is executed in S218, it outputs the corrected positioning result.

FIG. 6 schematically shows an example of the hardware configuration of a computer 1200 that functions as the communication terminal 100 or the server 200. The program installed on the computer 1200 causes the computer 1200 to function as one or more "parts" of the apparatus according to the present embodiment, or causes the computer 1200 to perform operations associated with the apparatus according to the present embodiment or the one or more "parts" of the apparatus according to the present embodiment. Multiple units may be executed and/or the computer 1200 may execute a process or a stage of a process according to the present embodiments. Such programs may be executed by CPU 1212 to cause computer 1200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

The computer 1200 according to this embodiment includes a CPU 1212, a RAM 1214, and a graphics controller 1216, which are interconnected by a host controller 1210. Computer 1200 also includes input/output units such as a communication interface 1222, a storage device 1224, a DVD drive, and an IC card drive, which are connected to host controller 1210 via input/output controller 1220. The DVD drive may be a DVD-ROM drive, a DVD-RAM drive, etc. Storage device 1224 may be a hard disk drive, solid state drive, or the like. Computer 1200 also includes legacy input/output units, such as ROM 1230 and a keyboard, which are connected to input/output controller 1220 via input/output chips 1240.

The CPU 1212 operates according to programs stored in the ROM 1230 and RAM 1214, thereby controlling each unit. Graphics controller 1216 obtains image data generated by CPU 1212, such as in a frame buffer provided in RAM 1214 or itself, and causes the image data to be displayed on display device 1218.

Communication interface 1222 communicates with other electronic devices via a network. Storage device 1224 stores programs and data used by CPU 1212 within computer 1200. The DVD drive reads a program or data from a DVD-ROM or the like and provides it to the storage device 1224. The IC card drive reads programs and data from and/or writes programs and data to the IC card.

ROM 1230 stores therein programs that are dependent on the computer 1200 hardware, such as a boot program that is executed by the computer 1200 upon activation. I/O chip 1240 may also connect various I/O units to I/O controller 1220 via USB ports, parallel ports, serial ports, keyboard ports, mouse ports, etc.

The program is provided by a computer readable storage medium such as a DVD-ROM or an IC card. The program is read from a computer-readable storage medium, installed in storage device 1224, RAM 1214, or ROM 1230, which are also examples of computer-readable storage media, and executed by CPU 1212. The information processing described in these programs is read by the computer 1200 and provides coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured to implement the operation or processing of information according to the use of computer 1200.

For example, when communication is performed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded into the RAM 1214 and sends communication processing to the communication interface 1222 based on the processing written in the communication program. You can give orders. The communication interface 1222 reads transmission data stored in a transmission buffer area provided in a recording medium such as a RAM 1214, a storage device 1224, a DVD-ROM, or an IC card under the control of the CPU 1212, and transmits the read transmission data. Data is transmitted to the network, or received data received from the network is written to a reception buffer area provided on the recording medium.

Further, the CPU 1212 causes the RAM 1214 to read all or a necessary part of a file or database stored in an external recording medium such as a storage device 1224, a DVD drive (DVD-ROM), an IC card, etc. Various types of processing may be performed on the data. CPU 1212 may then write the processed data back to an external storage medium.

Various types of information, such as various types of programs, data, tables, and databases, may be stored on a recording medium and subjected to information processing. CPU 1212 performs various types of operations, information processing, conditional determination, conditional branching, unconditional branching, and information retrieval on data read from RAM 1214 as described elsewhere in this disclosure and specified by the program's instruction sequence. Various types of processing may be performed, including /substitutions, etc., and the results are written back to RAM 1214. Further, the CPU 1212 may search for information in a file in a recording medium, a database, or the like. For example, when a plurality of entries are stored in a recording medium, each having an attribute value of a first attribute associated with an attribute value of a second attribute, the CPU 1212 selects the first entry from among the plurality of entries. Search for an entry whose attribute value matches the specified condition, read the attribute value of the second attribute stored in the entry, and then set the attribute value to the first attribute that satisfies the predetermined condition. An attribute value of the associated second attribute may be obtained.

The programs or software modules described above may be stored in a computer-readable storage medium on or near computer 1200. Also, a storage medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, thereby allowing the program to be transferred to the computer 1200 via the network. provide.

Blocks in the flowcharts and block diagrams of the present embodiments may represent stages in a process in which an operation is performed or a "part" of a device responsible for performing the operation. Certain steps and units may be provided with dedicated circuitry, programmable circuitry provided with computer readable instructions stored on a computer readable storage medium, and/or provided with computer readable instructions stored on a computer readable storage medium. May be implemented by a processor. Dedicated circuitry may include digital and/or analog hardware circuits, and may include integrated circuits (ICs) and/or discrete circuits. Programmable circuits can perform AND, OR, EXCLUSIVE OR, NAND, NOR, and other logical operations, such as field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), etc. , flip-flops, registers, and memory elements.

A computer-readable storage medium may include any tangible device capable of storing instructions for execution by a suitable device such that a computer-readable storage medium with instructions stored therein may be illustrated in a flowchart or block diagram. A product will be provided that includes instructions that can be executed to create a means for performing specified operations. Examples of computer-readable storage media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer readable storage media include floppy disks, diskettes, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory). , Electrically Erasable Programmable Read Only Memory (EEPROM), Static Random Access Memory (SRAM), Compact Disk Read Only Memory (CD-ROM), Digital Versatile Disk (DVD), Blu-ray Disc, Memory Stick , integrated circuit cards, and the like.

Computer-readable instructions may include assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state configuration data, or instructions such as Smalltalk®, JAVA®, C++, etc. any source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as may include.

The computer-readable instructions are for producing means for a processor of a general purpose computer, special purpose computer, or other programmable data processing device, or programmable circuit to perform the operations specified in the flowchart or block diagrams. A general purpose computer, special purpose computer, or other programmable data processor, locally or over a local area network (LAN), wide area network (WAN), such as the Internet, to execute the computer readable instructions. It may be provided in a processor or programmable circuit of the device. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the range described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiments described above. It is clear from the claims that such modifications or improvements may be included within the technical scope of the present invention.

The execution order of each process, such as an operation, a procedure, a step, and a stage in the apparatus, system, program, and method shown in the claims, specification, and drawings, specifically refers to "before" or "before". It should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Even if the claims, specifications, and operational flows in the drawings are explained using "first," "next," etc. for convenience, this does not mean that it is essential to carry out the operations in this order. It's not a thing.

10 System, 20 Satellite, 22 GNSS signal, 32 Control station, 34 Monitoring station, 36 Satellite, 38 SBAS signal, 50 Network, 100 Communication terminal, 110 Storage unit, 112 Location information storage unit, 114 Area information storage unit, 116 Registration data storage unit, 118 success/failure storage unit, 120 positioning execution unit, 130 positioning control unit, 140 mobile communication unit, 150 server communication unit, 160 identification unit, 200 server, 1200 computer, 1210 host controller, 1212 CPU, 1214 RAM, 1216 graphic controller, 1218 display device, 1220 input/output controller, 1222 communication interface, 1224 storage device, 1230 ROM, 1240 input/output chip

Claims (18)

a positioning execution unit capable of performing GNSS positioning and SBAS correction;
a positioning control unit that controls the positioning execution unit not to execute the SBAS correction when a predetermined condition is satisfied ;
The positioning control unit determines whether the positioning accuracy of the GNSS positioning performed by the positioning execution unit is higher than a first predetermined threshold, or lower than a second threshold that is lower than the first threshold. The positioning execution unit is controlled not to execute the SBAS correction, and when the positioning accuracy is between the first threshold and the second threshold, the positioning execution unit executes the SBAS correction. A communication terminal that controls the a positioning execution unit capable of performing GNSS positioning and SBAS correction;
a positioning control unit that controls the positioning execution unit not to execute the SBAS correction when a predetermined condition is satisfied;
Equipped with
The positioning control unit controls the positioning execution unit not to perform the SBAS correction when the positioning accuracy of the GNSS positioning performed by the positioning execution unit is higher than a predetermined threshold, and is lower than the predetermined threshold, the communication terminal controls the positioning execution unit to execute the SBAS correction. a positioning execution unit capable of performing GNSS positioning and SBAS correction;
a positioning control unit that controls the positioning execution unit not to execute the SBAS correction when a predetermined condition is satisfied;
Equipped with
The positioning control unit controls whether or not to cause the positioning execution unit to execute the SBAS correction based on Ephemeris information regarding the position of the satellite provided in advance when the positioning execution unit executes AGNSS positioning. , communication terminal. a positioning execution unit capable of performing GNSS positioning and SBAS correction;
a positioning control unit that controls the positioning execution unit not to execute the SBAS correction when a predetermined condition is satisfied;
Equipped with
The positioning control unit is configured to prevent the positioning execution unit from performing the SBAS correction when the position indicated by the positioning result of the GNSS positioning performed by the positioning execution unit is located within a predetermined area. and controlling the positioning execution unit to execute the SBAS correction when the position indicated by the positioning result is not located within the predetermined area. The predetermined areas include areas registered as areas that are likely to be out of range of SBAS signals, areas outside the SBAS support area, and areas where the elevation angle of the SBAS satellite is lower than a predetermined angle. The communication terminal according to claim 4 , which is in at least one of the areas. A communication terminal,
a positioning execution unit capable of performing GNSS positioning and SBAS correction;
a positioning control unit that controls the positioning execution unit not to execute the SBAS correction when a predetermined condition is satisfied;
a location information storage unit that stores location information of the communication terminal identified by positioning by the positioning execution unit ;
Equipped with
The positioning control unit transmits the SBAS to the positioning execution unit when determining that the communication terminal is located within a predetermined area based on the history of the position information stored in the position information storage unit. A communication terminal that controls not to perform correction, and controls the positioning execution unit to perform the SBAS correction when it is determined that the positioning execution unit is not located within the predetermined area. When the positioning control unit determines that the communication terminal is located within the predetermined area based on the history of the position information stored in the position information storage unit, the positioning execution unit: The communication terminal according to claim 6 , wherein the communication terminal is controlled not to perform SBAS signal reception processing. a positioning execution unit capable of performing GNSS positioning and SBAS correction;
a positioning control unit that controls the positioning execution unit not to execute the SBAS correction when a predetermined condition is satisfied;
a mobile communication unit that performs mobile communication by wirelessly communicating with a wireless base station ;
Equipped with
The positioning control unit determines whether or not to cause the positioning execution unit to perform the SBAS correction based on base station related information related to the wireless base station that the mobile communication unit has received from the wireless base station. A communication terminal. The base station related information includes base station identification information that can identify the wireless base station,
When the radio base station identified by the base station identification information received by the mobile communication unit is a pre-registered radio base station, the positioning control unit causes the positioning execution unit to perform the SBAS correction. 9. The communication terminal according to claim 8 , wherein the communication terminal is controlled so as not to be caused. When the base station identification information received by the mobile communication unit is included in the registration data including a plurality of base station identification information received from the server in advance, the positioning control unit causes the positioning execution unit to transmit the SBAS to the base station identification information. The communication terminal according to claim 9 , wherein the communication terminal is controlled not to perform correction. a success/failure storage unit that stores success or failure of the SBAS correction by the positioning execution unit when the communication terminal is located in the wireless base station in association with base station identification information of the wireless base station;
further comprising: a specifying unit that specifies the success rate of SBAS correction for each of the plurality of wireless base stations based on the information stored in the success/failure storage unit;
The positioning control unit executes the positioning when the success rate of the SBAS correction of the wireless base station identified by the base station identification information received by the mobile communication unit is lower than a predetermined threshold. 10. The communication terminal according to claim 9 , wherein the communication terminal controls the communication terminal not to perform the SBAS correction. A program for causing a computer to function as the communication terminal according to any one of claims 1 to 11 . A positioning control method executed by a communication terminal including a positioning execution unit capable of performing GNSS positioning and SBAS correction,
When a predetermined condition is met, the positioning execution unit is controlled not to execute the SBAS correction, and when the predetermined condition is not met, the positioning execution unit is controlled not to execute the SBAS correction. a positioning control stage that controls the execution of the
In the positioning control step, the positioning accuracy of the GNSS positioning performed by the positioning execution unit is higher than a predetermined first threshold, and when it is lower than a second threshold that is lower than the first threshold. The positioning execution unit is controlled not to execute the SBAS correction, and when the positioning accuracy is between the first threshold and the second threshold, the positioning execution unit executes the SBAS correction. A positioning control method that controls the A positioning control method executed by a communication terminal including a positioning execution unit capable of performing GNSS positioning and SBAS correction,
When a predetermined condition is met, the positioning execution unit is controlled not to execute the SBAS correction, and when the predetermined condition is not met, the positioning execution unit is controlled not to execute the SBAS correction. A positioning control stage that controls the execution of
Equipped with
The positioning control step controls the positioning execution unit not to perform the SBAS correction when the positioning accuracy of the GNSS positioning performed by the positioning execution unit is higher than a predetermined threshold, and the positioning accuracy is lower than the predetermined threshold value, the positioning execution unit is controlled to execute the SBAS correction. A positioning control method executed by a communication terminal including a positioning execution unit capable of performing GNSS positioning and SBAS correction,
When a predetermined condition is met, the positioning execution unit is controlled not to execute the SBAS correction, and when the predetermined condition is not met, the positioning execution unit is controlled not to execute the SBAS correction. A positioning control stage that controls the execution of
Equipped with
The positioning control step controls whether or not to cause the positioning execution unit to perform the SBAS correction based on Ephemeris information regarding the position of the satellite provided in advance when the positioning execution unit executes AGNSS positioning. , positioning control method. A positioning control method executed by a communication terminal including a positioning execution unit capable of performing GNSS positioning and SBAS correction,
When a predetermined condition is met, the positioning execution unit is controlled not to execute the SBAS correction, and when the predetermined condition is not met, the positioning execution unit is controlled not to execute the SBAS correction. A positioning control stage that controls the execution of
Equipped with
The positioning control step prevents the positioning execution unit from performing the SBAS correction when the position indicated by the positioning result of the GNSS positioning performed by the positioning execution unit is located within a predetermined area. and controlling the positioning execution unit to execute the SBAS correction when the position indicated by the positioning result is not located within the predetermined area. The method is executed by a communication terminal that includes a positioning execution unit capable of performing GNSS positioning and SBAS correction, and a position information storage unit that stores position information of the communication terminal specified by positioning by the positioning execution unit. A positioning control method comprising:
When a predetermined condition is met, the positioning execution unit is controlled not to execute the SBAS correction, and when the predetermined condition is not met, the positioning execution unit is controlled not to execute the SBAS correction. A positioning control stage that controls the execution of
Equipped with
In the positioning control step, when it is determined that the communication terminal is located within a predetermined area based on the history of the position information stored in the position information storage unit, the positioning execution unit controls the SBAS. A positioning control method, comprising: controlling not to perform correction, and controlling the positioning execution unit to perform the SBAS correction when it is determined that the position is not within the predetermined area. A positioning control method executed by a communication terminal comprising a positioning execution unit capable of performing GNSS positioning and SBAS correction, and a mobile communication unit configured to perform mobile communication by wirelessly communicating with a wireless base station, the method comprising:
When a predetermined condition is met, the positioning execution unit is controlled not to execute the SBAS correction, and when the predetermined condition is not met, the positioning execution unit is controlled not to execute the SBAS correction. A positioning control stage that controls the execution of
Equipped with
In the positioning control step, the mobile communication unit determines whether or not to cause the positioning execution unit to perform the SBAS correction based on base station related information related to the wireless base station that the mobile communication unit receives from the wireless base station. A positioning control method.

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