JP2020159709A - Wearable device, positioning control method, and positioning control program - Google Patents

Abstract

An object of the present invention is to shorten the time required for GPS positioning. An electronic timepiece (1) includes a GPS-IC (14) that performs positioning using radio waves received from satellites, a short-range wireless communication section (15) that communicates with a smartphone having a positioning function, and a CPU (11). The CPU 11 determines that the positioning time of the position information received from the smartphone by the short-range wireless communication unit 15 is newer than the previous positioning time stored in the memory 13, and the position of the position information received from the smartphone is stored in the memory 13. If it is away from the previous stored position by a predetermined value or more, the position information received from the smartphone is input to the GPS-IC 14 as valid position information together with the predicted ephemeris received from the smartphone. [Selection drawing] Fig. 1

Description

The present invention relates to wearable devices, positioning control methods, and positioning control programs.

In recent years, in a wearable device (for example, an electronic watch) having a positioning function using GPS (Global Positioning System), the time required for GPS positioning by receiving information on the positioning position possessed by a smartphone and referring to the information. There is a configuration to accelerate.

Patent Document 1 describes an invention for determining whether or not the wrist device stores updated ephemeris data. Patent Document 1 describes that when the updated ephemeris data is not stored, the updated ephemeris data is acquired from the secondary device.

U.S. Patent Application Publication No. 2014/0292566

Wearable devices such as wrist devices often have location information closer to the user's current position than secondary devices such as smartphones. Therefore, if the wearable device uses the position information measured by the smartphone without using the position information measured by the wearable device, the position information may be far from the user's current position. In such a case, the time required for GPS positioning may be delayed.
Therefore, it is an object of the present invention to increase the probability of shortening the time required for GPS positioning for wearable devices, positioning control methods, and positioning control programs.

In order to achieve the above object, the present invention
A positioning unit that executes positioning operations using radio waves received from satellites and acquires first position information that is the position of the own device and first time information that is the time when the position of the own device was acquired.
Communication that communicates with the external device and receives the second position information that is the position information of the external device, the orbit information related to the satellite, and the second time information that is the time when the external device acquired the second position information. Department and
A control unit that measures the current time and
A storage unit that stores the first position information, the first time information, the second position information, and the second time information.
It is a wearable device equipped with
When the positioning unit executes a positioning operation, the control unit causes the second time information stored in the storage unit to be closer to the current time than the first time information stored in the storage unit. The position of the second position information stored in the storage unit is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time stored in the storage unit. If the information is within a predetermined time from the current time, the second position information and the trajectory information received from the external device are transmitted to the positioning unit.
It is a wearable device characterized by this.

According to the present invention, it is possible to shorten the time required for GPS positioning.

It is a block diagram which shows the outline of the electronic clock in this embodiment. It is a block diagram of a smartphone. It is a flowchart (No. 1) of the process in which the watch acquires the position information and the predicted ephemeris information from the smartphone. It is a flowchart (No. 2) of the process in which the watch acquires the position information and the predicted ephemeris information from the smartphone. It is a flowchart of the process which turns off the smartphone position use flag after 24 hours have passed. It is a flowchart (1) of GPS reception processing by an electronic clock. It is a flowchart (2) of GPS reception processing by an electronic clock.

Hereinafter, a mode for carrying out the present invention will be described in detail with reference to each figure.
FIG. 1 is a configuration diagram showing an outline of the electronic clock 1 in the present embodiment.
The electronic watch 1 is an example of a wearable device, and includes a CPU (Central Processing Unit) 11, a display 12, a memory 13, a GPS-IC (Integrated Circuit) 14, and a short-range wireless communication unit 15. ..

The CPU 11 is a processing unit that controls each unit of the electronic clock 1. The display 12 is, for example, a liquid crystal display, and displays the time measured by the CPU 11. The memory 13 is composed of, for example, a flash memory, and stores a positioning control program (not shown) for execution by the CPU 11. The memory 13 is further acquired by the position information (first position information) acquired by the GPS-IC 14, the time information (first time information) at the time when the position of the first position information is positioned, and the short-range wireless communication unit 15. It is a storage unit that stores the position information (second position information) and the time information (second time information) at the time when the position of the second position information is positioned. The memory 13 is not limited to being composed of a flash memory.

The GPS-IC 14 (an example of the positioning unit) is a GPS receiving unit that performs positioning using radio waves received from GPS satellites, and includes a flash memory 141. By storing the predicted orbit information (predicted ephemeris) of the satellite in the flash memory 141, the GPS-IC14 can use this predicted ephemeris for hot start and complete the positioning in a short time. The GPS-IC 14 can complete the positioning in a shorter time by storing the predicted ephemeris in the flash memory 141 and further storing the effective position information.

The short-range wireless communication unit 15 is a communication unit that transmits and receives various information with an external device, for example, with a smartphone 2 described later, via a short-range wireless communication path such as Bluetooth (registered trademark) Low Energy. is there. Since the smartphone 2 has a GPS positioning function, the CPU 11 can receive the position information, the predicted ephemeris, and the acquisition time acquired by the smartphone 2 via the short-range wireless communication unit 15. The smartphone 2 may be provided with a means for acquiring position information in addition to the GPS positioning function. Further, the short-range wireless communication unit 15 may receive the position information obtained by the position information acquisition means other than the positioning function by GPS.

FIG. 2 is a configuration diagram of the smartphone 2.
The smartphone 2 includes a CPU 21, a display 22, a memory 23, a satellite radio wave receiving unit 24, and a short-range wireless communication unit 25.

The CPU 21 is a processing unit that controls each unit of the smartphone 2. The display 22 is, for example, a touch panel display and displays a graphical user interface for operating the smartphone 2. The memory 23 is composed of, for example, a flash memory, and stores a program or the like for execution by the CPU 21. The memory 23 is not limited to being composed of a flash memory.

The satellite radio wave receiving unit 24 is, for example, a GPS receiving unit that performs positioning using radio waves received from GPS satellites. The short-range wireless communication unit 25 transmits / receives information to / from the electronic clock 1 described above via a short-range wireless communication path such as Bluetooth (registered trademark) Low Energy. Note that the satellite radio wave receiving unit 24 is not limited to receiving radio waves from GPS satellites. A satellite positioning system other than GPS may be used as long as the same effect can be obtained.

<< About Predictive Ephemeris >>
The predicted ephemeris is the predicted orbit information of the satellite used to greatly extend the valid period of the orbit information (ephemeris) required for positioning and shorten the positioning time of the GPS receiving unit.

In order for the GPS receiver to perform positioning, satellite orbit information (ephemeris) is required. The GPS receiving unit acquires the ephemeris and uses the acquired ephemeris for positioning. At this time, the positioning can be completed in a short time by backing up the previously acquired ephemeris in the memory and reading it at the time of positioning. This is called a hot start.
If the ephemeris is not backed up here, the ephemeris will be obtained from the navigation message, which will take longer than the hot start. Such an operation is called a cold start.

Ephemeris has an expiration date of about 4 hours, after which you must acquire a new ephemeris. Therefore, the period during which the GPS receiver can quickly perform hot start is usually about 4 hours from the time of the previous acquisition of the ephemeris. With a device that incorporates a GPS receiver (for example, a GPS logger), if the power is turned off for 4 hours or more, the cold start will occur the next time the power is turned on and positioning is performed again, so it will take longer than the hot start. It was hanging.

Predicted ephemeris refers to orbital information that predicts and estimates the satellite position up to a predetermined time in the future based on the position information (latitude and longitude) of the ephemeris and the device received from the satellite. With the predicted ephemeris, it is possible to realize a hot start for a time of 4 hours or more after acquiring the ephemeris.

Further, each time the GPS receiving unit receives a new ephemeris, the GPS receiving unit calculates it internally as necessary, so that the user can use it without any troublesome operation. At this time, the ephemeris received from the satellite must be acquired within a predetermined time, and the position information of the device must not be away from the user's position.

The method of using the position information and the ephemeris measured by the electronic clock 1 most recently is effective in a situation where the user trains at the same place every time, and the probability of hot start increases. However, when the user travels on a business trip or the like, the position information measured by the electronic clock 1 and the user's position are separated from each other, so that hot start may not be possible.

On the other hand, the method in which the electronic watch 1 receives the position information and the ephemeris from an external device such as the smartphone 2 can satisfy the hot start requirement because the effective position information can be used even at the destination if the smartphone 2 holds the position information. there is a possibility. If the user sets the GPS application's location information acquisition setting on the smartphone 2 to "always allow", the GPS application periodically acquires the location information. In this case, the smartphone 2 is likely to be able to hold the user's latest position information, and is likely to be able to hot start.

However, if the user sets the GPS application location information acquisition setting to "Do not allow" or "Allow only when using the application", the frequency with which the smartphone 2 can acquire the GPS application location information decreases, so the latest It may not hold location information. Further, in that case, the electronic clock 1 often holds the user's nearest position information rather than the smartphone 2.

Therefore, when the electronic clock 1 receives the position information from the smartphone 2, the time information obtained from the position information is also obtained, and the electronic clock 1 is newer (closer to the current time) than the previous positioning time. Try to adopt location information. By this processing, positioning can be performed using the most recent position information, which facilitates hot start. This process is shown in FIG. 3, which will be described later.

However, even if new location information is adopted among the location information possessed by the electronic clock 1 and the smartphone 2, it is not always easy to make a hot start. For example, the position information measured by the smartphone 2 is the position information of the destination far away from the place where the user usually trains, and the next place where the user returns from the destination and the user usually trains at a later date. Even when performing positioning, there is a risk that the position information measured by the smartphone 2 will be used. In this case, since the latest position information of the smartphone 2 is far away from the place where the user usually trains, there is a possibility that hot start cannot be performed. Therefore, in this case, it is better to use the new position information measured most recently by the electronic clock 1 which may hold the position information of the place where the user usually trains. That is, even if the smartphone 2 has newly acquired position information as compared with the electronic clock 1, if a certain amount of time has passed since the position information was acquired, the position where the electronic clock 1 has been most recently positioned. It is often better to use information. Therefore, when the position information measured by the smartphone 2 is used, the time when the position information is acquired needs to be close to the current time to some extent. Therefore, in order to use the position information measured by the smartphone 2, the condition "when the positioning time of the position information acquired from the smartphone 2 is within a predetermined time from the current time" is also added. This process is shown in FIG. 4, which will be described later.

However, if the "predetermined time" is too short, it becomes difficult to use the position information measured by the smartphone 2 at the destination. Therefore, after giving a certain length to the "predetermined time", the condition "when the predetermined distance is far away" is added to the position information to be used by the electronic clock 1 at the next positioning. Determine the position information to be used at the next positioning. As a result, when performing regular training, the electronic clock 1 can increase the probability that the new position information measured by the GPS receiving unit most recently can be used. Further, when the user trains or races at a destination far away from the place where the user usually trains, the electronic clock 1 shortens the time required for GPS positioning by using the more effective position information measured by the smartphone 2. You can increase the probability.

3A and 3B are flowcharts of a process in which the electronic clock 1 acquires position information and predicted ephemeris information from the smartphone 2.
<< Processing of smartphone 2 >>
The CPU 21 of the smartphone 2 and the position information (latitude / longitude) acquired by the smartphone 2 via Bluetooth (registered trademark) Low Energy communication from the smartphone 2 by executing an application for interlocking with the electronic clock 1. Receive the time when the position was acquired.
The CPU 21 of the smartphone 2 determines whether or not the GPS information acquisition condition is satisfied after activation (S10). Here, the GPS information acquisition condition is, for example, the setting of the GPS application of the smartphone 2. If the user sets the GPS application location information acquisition setting to "not permitted", the GPS acquisition condition is not satisfied. If the user sets the GPS application location information acquisition setting to "permit only when using the application", the GPS information acquisition condition is satisfied when the GPS application is used. If the user sets the GPS application location information acquisition setting on the smartphone 2 to "always allow", the GPS information acquisition condition is always satisfied. Further, the condition is not limited to this, and apart from the setting of the GPS application, for example, the elapsed time from the previous acquisition of GPS information can also be a condition.

In step S10, if the GPS information acquisition condition is satisfied (Yes), the CPU 21 acquires the position information and the predicted ephemeris from the satellite radio waves (S11), and proceeds to the process of step S12. If the GPS information acquisition condition is not satisfied (No), the CPU 21 returns to the process of step S10. In step S11, the CPU 21 calculates the predicted ephemeris, which is the orbit information that predicts and estimates the satellite position up to a predetermined time in the future, based on the ephemeris received from the satellite and the position information (latitude and longitude) of the device.

In step S12, the CPU 21 determines whether or not the connection condition with the electronic clock 1 is satisfied. The connection conditions between the electronic watch 1 are, for example, when the electronic watch 1 and the smartphone 2 are linked, when the link is reconnected from the link loss, when the time zone switching notification is received from the smartphone 2 that executes the application, and Bluetooth ( It is established when the automatic time adjustment timing by Low Energy, the application for linking with the electronic clock 1 on the smartphone 2 is started, and the like. As long as the data can be received from the smartphone 2, the conditions may not be limited to the above.

If the connection condition with the electronic clock 1 is satisfied (Yes), the CPU 21 transmits the acquired position information, the acquisition time, and the predicted ephemeris to the electronic clock 1 (S13), and then returns to the process of step S10. If the connection condition with the electronic clock 1 is not satisfied (No), the CPU 21 returns to the process of step S10. In this way, the CPU 21 of the smartphone 2 executes positioning by GPS and transmission of the positioned position information and the like under different conditions. Therefore, the acquisition time of the position information and the transmission time of the position information do not match. Therefore, the CPU 21 transmits the acquisition time of the position information together with the transmission of the position information. The method of obtaining the acquisition time of the position information is not limited. For example, it may be obtained by using the radio wave received from the GPS satellite when the smartphone 2 is positioned by GPS, or it may be obtained by using the time measured by the CPU 21 of the smartphone 2. Further, it may be obtained by a combination of the time measured by the CPU 21 of the smartphone 2 and the information obtained from the radio wave received from the GPS satellite.

<< Processing of electronic clock 1 >>
Hereinafter, a process in which the electronic clock 1 receives the position information from the smartphone 2, the acquisition time of the position information acquired by the smartphone 2, and the predicted ephemeris will be described. Hereinafter, the flowcharts shown in FIGS. 3A, 3B, 4 and 5, show the processing when the CPU 11 executes the positioning control program stored in the memory 13. The initial values of the "position use flag at the time of next GPS reception" and the "smartphone position use flag" immediately after the CPU 11 is started are OFF.

When the CPU 11 of the electronic clock 1 receives the position information, the acquisition time, and the predicted ephemeris transmitted in step S12 described above (S20), the received position information is the position information acquired for the first time after the restart of the electronic clock 1. It is determined whether or not it is (S21). Here, the restart includes an all-clear (AC), which is an initialization of the software of the electronic clock 1, and a battery all-clear (BAC), which is a restart when the power supply voltage drops. If the position information received in step S20 is the position information first acquired after the restart of the electronic clock 1 (AC) or the battery all clear (BAC) (Yes), the CPU 11 performs the process of step S29 in FIG. 3B. Proceed to.

If the position information received in step S20 is not the position information acquired for the first time after the restart of the electronic watch 1 or the battery all clear (BAC) (No), the CPU 11 determines the "smartphone position use flag" (hereinafter, It is determined whether or not the smartphone position use flag) is ON (S22).

In step S22, if the "smartphone position use flag" is ON (Yes), the CPU 11 determines whether or not the current position information acquisition time by the smartphone 2 is newer than the previous position information acquisition time by the smartphone 2. (S24). This "smartphone position use flag" is a flag indicating that the position information received from the smartphone 2 is used at the time of positioning. The previous acquisition time of the position information by the smartphone 2 is stored in the memory 13.
If the acquisition time of the position information by the smartphone 2 this time is not closer to the current time than the acquisition time of the position information by the smartphone 2 last time (No), the CPU 11 ends the processing of FIGS. 3A and 3B.
If the acquisition time of the smartphone position information this time is newer than the acquisition time of the smartphone position information last time (Yes), the CPU 11 proceeds to the process of step S25 of FIG. 3B.

In step S22, if the "smartphone position use flag" is OFF (No), the CPU 11 determines whether or not the acquisition time of the position information by the smartphone 2 this time is closer to the current time than the acquisition time of the previous GPS position information. (S23). The previous acquisition time of GPS position information is stored in the memory 13. Here, the previous GPS position information represents the position information acquired at the time closest to the current time held in the memory 13 of the electronic clock 1. In the case of this embodiment, since the memory 13 has the position information obtained by the positioning by the electronic clock 1 and the position information received from the smartphone 2, the position information acquired at the time closest to the current time among them is stored. This is the previous GPS position information. Although the previous GPS position information is used, for example, when the smartphone 2 has a means for acquiring position information other than GPS, the time when the position information is acquired is stored in the memory 13 and compared. May be.
If the acquisition time of the position information by the smartphone 2 this time is not closer to the current time than the acquisition time of the previous GPS position information (No), the CPU 11 ends the processing of FIGS. 3A and 3B.
If the acquisition time of the smartphone position information this time is closer to the current time than the acquisition time of the previous GPS position information (Yes), the CPU 11 proceeds to the process of step S25 of FIG. 3B.

In step S25, the CPU 11 determines whether or not the acquisition time of the smartphone position information this time is within 24 hours from the current time. If the acquisition time of the smartphone position information this time has passed 24 hours from the current time (No), the CPU 11 ends the processing of FIGS. 3A and 3B. If the acquisition time of the position information by the smartphone 2 this time is within 24 hours (Yes), the CPU 11 proceeds to the process of step S26, and from the previous position information and the position information by the smartphone 2 this time, the previous position information and this time. The distance between the smartphone 2 and the location information is calculated (S26).

For example, when the smartphone 2 acquires the position information at the user's business trip destination and the electronic watch 1 uses the position of the smartphone 2 after the user returns home, the position information far away from the user's current position is used for positioning. turn into. Therefore, a time limit as shown in step S25 is required. However, the time limit is not limited to 24 hours. For example, a time limit other than 24 hours may be set depending on the use of the device, the mode of the device, and the like.

In step S27, the CPU 21 determines whether or not the calculated distance exceeds 75 km. If the calculated distance does not exceed 75 km (No), the CPU 21 ends the processes of FIGS. 3A and 3B. If the calculated distance exceeds 75 km (Yes), the CPU 21 proceeds to the process of step S28. The reason why the determination condition in step S27 is 75 km is that the hot start condition of GPS-IC14 is within 75 km with respect to the true value. However, the distance that is the judgment condition is not limited to 75 km. For example, a distance other than 75 km may be set as a determination condition according to the performance of the GPS-IC mounted on the device.

In step S28, the CPU 11 turns on the “next GPS reception position use flag” and then turns on the “smartphone position use flag” (S29). The "position use flag at the time of next GPS reception" indicates that the position information has been received after the restart.

In the present embodiment, the CPU 21 updates the position information by the smartphone 2 stored in the memory 13 with the position information acquired from the smartphone this time (S30), and updates the smartphone position acquisition time (S31). It should be noted that the next time the electronic clock 1 is positioned, it is sufficient that the position information measured at the time closest to the current time can be used, so that the past position information data does not need to be deleted when the electronic clock 1 is updated. good. Further, when the prediction ephemeris is set in the flash memory 141 in the GPS-IC14 (S32), the CPU 11 ends the processes of FIGS. 3A and 3B.

By the processing of FIGS. 3A and 3B, the electronic clock 1 can be hot-started together with the predicted ephemeris by inputting the position information (latitude / longitude information) to the GPS-IC14 before starting the GPS reception. , The time to complete positioning can be significantly shortened.

FIG. 4 is a flowchart of a process of turning off the smartphone position use flag 24 hours after the time when the smartphone 2 is positioned. This process is executed, for example, every time the CPU 11 of the electronic clock 1 counts for one hour, but is not limited to this, and may be executed every ten minutes, for example.
In step S40, the CPU 11 determines whether or not the "position use flag at the time of next GPS reception" is ON. If the "position use flag at the time of next GPS reception" is OFF (No), the CPU 11 ends the process of FIG.

If the "next GPS reception time position use flag" is ON (Yes), the CPU 11 proceeds to the process of step S41 and determines whether or not the "smartphone position use flag" is ON. If the "smartphone position use flag" is OFF (No), the CPU 11 ends the process of FIG.

If the "smartphone position use flag" is ON (Yes), the CPU 11 proceeds to the process of step S42 and determines whether or not 24 hours have passed from the time (position acquisition time) determined by the smartphone 2. If it is within 24 hours from the position acquisition time of the smartphone 2 (No), the CPU 11 ends the process of FIG.

If 24 hours have passed from the position acquisition time of the smartphone 2 (Yes), the CPU 11 proceeds to the process of step S43, sets the “smartphone position use flag” to OFF (S43), and ends the process of FIG. ..

That is, in the present embodiment, the expiration date of the location information acquired by the smartphone 2 is 24 hours after the location information is acquired, so that the CPU 11 will "smartphone position" after 24 hours have passed from the acquisition time of the location information of the smartphone 2. Turn off the "use flag".

5A and 5B are flowcharts of GPS reception processing by the electronic clock 1. This GPS reception processing is activated when the GPS-IC14 receives radio waves from GPS satellites, and executes a process (positioning operation) of acquiring position information based on the radio wave information of the satellites.

During the period from the activation of the GPS-IC14 to the execution of the reception command, the CPU 11 obtains the execution parameter address map of the GPS-IC14 according to the determination results as shown in steps S52 and S53 of FIG. 5A. Through writing, hot start setting and position information (latitude / longitude information) are written.

At the beginning of the GPS reception processing by the electronic clock 1, the CPU 11 activates the GPS-IC14 (S50). If the flash memory 141 does not hold a valid prediction ephemeris (S51 → No), the CPU 11 proceeds to the process of step S54 and does not transmit the position information (latitude / longitude information) to the execution parameter map. As a result, the GPS-IC14 starts cold. Here, the case where the predicted ephemeris is not held includes the case where the device is restarted or the battery is completely cleared, and the case where the predicted ephemeris is obtained and the expiration date of the predicted ephemeris is exceeded. When step S54 is executed, since it is a cold start, the time required for positioning by the GPS-IC14 is longer than that in steps S55 to 57 described later.

In step S51, if the CPU 11 holds a valid predicted ephemeris (Yes), it proceeds to the process of step S52 and determines whether or not the "position use flag at the time of next GPS reception" is ON.

If the "position use flag at the time of next GPS reception" is OFF (No), the CPU 11 proceeds to the process of step S57 and does not transmit the position information (latitude / longitude information) to the execution parameter map. However, because it retains a valid predictive ephemeris, the GPS-IC14 can be hot started. Since it is a hot start, the time required for positioning by the GPS-IC14 is shorter than that in step S54. As a result, the CPU 11 can complete the positioning in a shorter time than the cold start setting in step S54. However, since positioning is performed without inputting position information (latitude / longitude information) in the execution parameter map, the time required for positioning is longer than in steps S55 and S56 described later.

If the "next GPS reception time position use flag" is ON (Yes), the CPU 11 proceeds to the process of step S53 and determines whether or not the "smartphone position use flag" is ON.
If the "smartphone position use flag" is ON (Yes), the CPU 11 proceeds to the process of step S55 and transmits the position information (latitude / longitude information) positioned by the smartphone 2 to the execution parameter map. As a result, the GPS-IC14 can be hot-started. As a result, the CPU 11 can complete the positioning in a shorter time than the hot start setting in step S57.

If the "smartphone position use flag" is ON in step S53 (Yes), the CPU 11 proceeds to the process of step S55 and inputs the latitude / longitude information positioned by the smartphone 2 into the execution parameter map. As a result, the GPS-IC14 can be hot-started. At this time, the time required for the GPS-IC14 to perform positioning is about several seconds. As a result, the CPU 11 can complete the positioning in a shorter time than the hot start setting in step S57.

After that, the GPS-IC14 starts receiving the GPS radio wave (S58), and the CPU 11 determines whether or not the GPS reception is successful (S59). If the GPS reception fails (No), the CPU 11 ends the processes of FIGS. 5A and 5B.

If the CPU 11 succeeds in receiving the GPS by the GPS-IC14 (Yes), the CPU 11 proceeds to the process of step S60. The CPU 11 turns on the "next GPS reception position use flag" (S60) and turns off the "smartphone position use flag" so that the acquired position information can be used at the next reception (S61). After that, the CPU 11 ends the GPS reception by the GPS-IC14 (S62). In the present embodiment, the GPS position information is updated with the position information acquired this time by the GPS-IC14 (S63). It should be noted that the next time the electronic clock 1 is positioned, it is sufficient that the position information measured at the time closest to the current time can be used, so that the past position information data does not need to be deleted when the electronic clock 1 is updated. good. When the process of step S63 is completed, the process proceeds to step S64. Further, when the CPU 11 updates the acquisition time of the GPS position information (S64), the processes of FIGS. 5A and 5B are completed. The method by which the CPU 11 acquires the acquisition time of the GPS position information is not limited. For example, time information may be acquired from GPS radio waves, or may be acquired using the time measured by the CPU 11. Further, the time information may be acquired by combining the time information measured by the CPU 11 and the information obtained from the GPS radio wave.

(Modification example)
The present invention is not limited to the above-described embodiment, and can be modified without departing from the spirit of the present invention. For example, the following (a) to (f) are included.

(A) The electronic clock 1 of the above embodiment downloads the predicted ephemeris together with the position information from the smartphone 2. However, the present invention is not limited to this, and may be downloaded from the smartphone 2 under different conditions.
(B) The present invention is not limited to the electronic watch 1 of the above embodiment, and may be applied to all wearable devices.
(C) The external device that transmits the position information and the ephemeris to the electronic watch 1 is not limited to the smartphone 2, and may be any device having a GPS positioning function.
(D) The predicted ephemeris is not limited to the flash memory, and may be a RAM (Random Access Memory) in the GPS-IC. It may be in the memory 13.
(E) The communication method between the electronic clock 1 and the smartphone 2 is not limited to Bluetooth (registered trademark) Low Energy, and any wireless communication such as Wi-Fi (registered trademark), ZigBee (registered trademark), IrDA, etc. The method may be used.
(F) There may be changes in the flowcharts shown in FIGS. 3A to 5B within the range in which the same effect is achieved. For example, the order of steps S25 to S27 shown in FIG. 3B may be changed.

The inventions described in the claims originally attached to the application of this application are added below. The item number of the claim described in the appendix is the scope of the claims originally attached to the application of this application.

[Additional Notes]
<< Claim 1 >>
A positioning unit that executes positioning operations using radio waves received from satellites and acquires first position information that is the position of the own device and first time information that is the time when the position of the own device was acquired.
Communication that communicates with the external device and receives the second position information that is the position information of the external device, the orbit information related to the satellite, and the second time information that is the time when the external device acquired the second position information. Department and
A control unit that measures the current time and
A storage unit that stores the first position information, the first time information, the second position information, and the second time information.
It is a wearable device equipped with
When the positioning unit executes a positioning operation, the control unit causes the second time information stored in the storage unit to be closer to the current time than the first time information stored in the storage unit. The position of the second position information stored in the storage unit is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time stored in the storage unit. If the information is within a predetermined time from the current time, the second position information and the trajectory information received from the external device are transmitted to the positioning unit.
Wearable equipment that is characterized by that.
<< Claim 2 >>
The predetermined time is 24 hours.
The wearable device according to claim 1, wherein the wearable device is characterized by the above.
<< Claim 3 >>
The predetermined distance is 75 km.
The wearable device according to claim 1 or 2.
<< Claim 4 >>
The positioning unit cold-starts if the orbit information received from the external device is not valid, and hot-starts using the orbit information if the orbit information is valid.
The wearable device according to any one of claims 1 to 3, wherein the wearable device is characterized by the above.
<< Claim 5 >>
A step in which the positioning unit executes a positioning operation using radio waves received from a satellite to acquire first position information which is the position of the own device and first time information which is the time when the position of the own device is acquired.
The communication unit communicates with the external device, and the second position information which is the position information of the external device, the orbit information related to the satellite, and the second time information which is the time when the external device acquires the second position information. Steps to receive and
A step in which the storage unit stores the first position information, the first time information, the second position information, and the second time information.
When the control unit causes the positioning unit to perform a positioning operation, the second time information stored in the storage unit is closer to the current time than the first time information stored in the storage unit, and the said The position of the second position information stored in the storage unit is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time stored in the storage unit. If the information is within a predetermined time from the current time, the step of transmitting the second position information and the trajectory information received from the external device to the positioning unit, and
A positioning control method characterized by executing.
<< Claim 6 >>
On the computer
A step in which the positioning unit executes a positioning operation using radio waves received from a satellite to acquire first position information which is the position of the own device and first time information which is the time when the position of the own device is acquired.
The communication unit communicates with the external device, and the second position information which is the position information of the external device, the orbit information related to the satellite, and the second time information which is the time when the external device acquires the second position information. Steps to receive and
A step in which the storage unit stores the first position information, the first time information, the second position information, and the second time information.
When the positioning unit executes a positioning operation, the second time information stored in the storage unit is closer to the current time than the first time information stored in the storage unit, and is stored in the storage unit. The position of the second position information is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time information stored in the storage unit is the present. If it is within a predetermined time from the time, the step of transmitting the second position information and the trajectory information received from the external device to the positioning unit, and
Positioning control program to execute.

1 Electronic watch (wearable device)
11 CPU (control unit)
12 Display 13 Memory (storage unit)
14 GPS-IC (Positioning System)
141 Flash memory 15 Short-range wireless communication unit (communication unit)
2 Smartphone (external device)
21 CPU
22 Display 23 Memory 24 Satellite radio wave receiver 25 Short-range wireless communication unit

Claims (6)

A positioning unit that executes positioning operations using radio waves received from satellites and acquires first position information that is the position of the own device and first time information that is the time when the position of the own device was acquired.
Communication that communicates with the external device and receives the second position information that is the position information of the external device, the orbit information related to the satellite, and the second time information that is the time when the external device acquired the second position information. Department and
A control unit that measures the current time and
A storage unit that stores the first position information, the first time information, the second position information, and the second time information.
It is a wearable device equipped with
When the positioning unit executes a positioning operation, the control unit causes the second time information stored in the storage unit to be closer to the current time than the first time information stored in the storage unit. The position of the second position information stored in the storage unit is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time stored in the storage unit. If the information is within a predetermined time from the current time, the second position information and the trajectory information received from the external device are transmitted to the positioning unit.
Wearable equipment that is characterized by that. The predetermined time is 24 hours.
The wearable device according to claim 1, wherein the wearable device is characterized by the above. The predetermined distance is 75 km.
The wearable device according to claim 1 or 2. The positioning unit cold-starts if the orbit information received from the external device is not valid, and hot-starts using the orbit information if the orbit information is valid.
The wearable device according to any one of claims 1 to 3, wherein the wearable device is characterized by the above. A step in which the positioning unit executes a positioning operation using radio waves received from a satellite to acquire first position information which is the position of the own device and first time information which is the time when the position of the own device is acquired.
The communication unit communicates with the external device, and the second position information which is the position information of the external device, the orbit information related to the satellite, and the second time information which is the time when the external device acquires the second position information. Steps to receive and
A step in which the storage unit stores the first position information, the first time information, the second position information, and the second time information.
When the control unit causes the positioning unit to perform a positioning operation, the second time information stored in the storage unit is closer to the current time than the first time information stored in the storage unit, and the said The position of the second position information stored in the storage unit is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time stored in the storage unit. If the information is within a predetermined time from the current time, the step of transmitting the second position information and the trajectory information received from the external device to the positioning unit, and
A positioning control method characterized by executing. On the computer
A step in which the positioning unit executes a positioning operation using radio waves received from a satellite to acquire first position information which is the position of the own device and first time information which is the time when the position of the own device is acquired.
The communication unit communicates with the external device, and the second position information which is the position information of the external device, the orbit information related to the satellite, and the second time information which is the time when the external device acquires the second position information. Steps to receive and
A step in which the storage unit stores the first position information, the first time information, the second position information, and the second time information.
When the positioning unit executes a positioning operation, the second time information stored in the storage unit is closer to the current time than the first time information stored in the storage unit, and is stored in the storage unit. The position of the second position information is separated from the position of the first position information stored in the storage unit by a predetermined distance or more, and the second time information stored in the storage unit is the present. If it is within a predetermined time from the time, the step of transmitting the second position information and the trajectory information received from the external device to the positioning unit, and
Positioning control program to execute.

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