JP7259459B2 - WEARABLE DEVICE, POSITIONING CONTROL METHOD, AND POSITIONING CONTROL PROGRAM - Google Patents

Description

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

In recent years, wearable devices (e.g., electronic watches) that have a positioning function using GPS (Global Positioning System) receive positioning position information held by smartphones and refer to that information to measure the time required for GPS positioning. There is a configuration in which the

Patent Literature 1 describes an invention that determines whether or not a wrist device stores updated ephemeris data. Patent Literature 1 describes obtaining updated ephemeris data from a secondary device when updated ephemeris data is not stored.

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

Wearable devices such as wrist devices often have location information closer to the user's current location than secondary devices such as smartphones. Therefore, if the wearable device does not use the position information obtained by positioning itself but uses the position information obtained by positioning by the smartphone, the position information may be rather far from the current position of the user. In such a case, the time required for GPS positioning may be delayed.
Accordingly, an object of the present invention is to increase the probability of shortening the time required for GPS positioning with respect to a wearable device, a positioning control method, and a positioning control program.

In order to achieve the above object, the present invention
a positioning unit that performs a positioning operation using radio waves received from satellites and obtains first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
Communicate with an external device to receive second position information, which is position information measured by the external device, orbit information related to the satellite, and second time information, which is the time when the external device acquires the second position information a communication unit that
a control unit that measures the current time;
a storage unit that stores the first location information, the first time information, the second location information, and the second time information;
A wearable device comprising
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 when causing the positioning unit to perform the positioning operation. 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, transmitting the second position information and the trajectory information received from the external device to the positioning unit;
It is a wearable device characterized by

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

1 is a configuration diagram showing an outline of an electronic timepiece according to an embodiment; FIG. 1 is a configuration diagram of a smartphone; FIG. 10 is a flowchart (part 1) of processing for the watch to acquire position information and predicted ephemeris information from the smartphone; FIG. 10 is a flowchart (part 2) of processing for the watch to acquire position information and predicted ephemeris information from the smartphone; FIG. 10 is a flowchart of processing for turning off the smartphone location use flag after 24 hours have elapsed. 10 is a flowchart (part 1) of the GPS reception process by the electronic timepiece; FIG. 11 is a flowchart (part 2) of the GPS reception process by the electronic timepiece; FIG.

EMBODIMENT OF THE INVENTION Henceforth, the form for implementing this invention is demonstrated in detail with reference to each figure.
FIG. 1 is a configuration diagram showing an outline of an electronic timepiece 1 according to this embodiment.
The electronic timepiece 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 section that controls each section of the electronic timepiece 1 in an integrated manner. 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 the CPU 11 to execute. The memory 13 further includes position information (first position information) acquired by the GPS-IC 14, time information (first time information) of the time when the position of the first position information was measured, and the time information (second time information) of the time when the position of the second position information was determined. Note that the memory 13 is not limited to being composed of a flash memory.

A GPS-IC 14 (an example of a 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 predicted orbit information (predicted ephemeris) of satellites in the flash memory 141, the GPS-IC 14 can use this predicted ephemeris for hot start and complete positioning in a short time. The GPS-IC 14 stores predicted ephemeris in the flash memory 141 and further stores effective position information, thereby completing positioning in a shorter time.

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

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

The CPU 21 is a processing unit that performs integrated control of each unit of the smartphone 2 . The display 22 is, for example, a touch panel display, and displays a graphical user interface for operating this smart phone 2 . The memory 23 is composed of, for example, a flash memory, and stores programs and the like for the CPU 21 to execute. Note that 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 and receives information to and from the electronic timepiece 1, for example, via a short-range wireless communication path such as Bluetooth (registered trademark) Low Energy. It should be noted that what the satellite radio wave receiving unit 24 receives is not limited to 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》
Predicted ephemeris is satellite predicted orbit information used to greatly extend the effective period of orbit information (ephemeris) required for positioning and shorten the time required for positioning by the GPS receiver.

Satellite orbital information (ephemeris) is required for positioning by the GPS receiver. The GPS receiver acquires ephemeris and performs positioning using the acquired ephemeris. At this time, by backing up the previously obtained ephemeris in memory and reading it out at the time of positioning, positioning can be completed in a short period of time. This is called hot start.
If the ephemeris is not backed up here, it 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 a new ephemeris must be obtained. Therefore, the hot start period in which the GPS receiver unit can quickly perform positioning is normally about 4 hours from the previous acquisition of ephemeris. Devices with a built-in GPS receiver (such as GPS loggers) that have been turned off for 4 hours or more will be cold-started when the power is turned on again and positioning will take longer than a hot-start. was hanging.

Predicted ephemeris is orbit information obtained by predicting and estimating 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. Predictive ephemeris can provide hot start for 4 hours or more after acquiring ephemeris.

In addition, the GPS receiver can be used without troublesome operations by performing internal calculations as necessary each time a new ephemeris is received. At this time, the ephemeris received from the satellite must have been acquired within a predetermined period of time, and the location information of the device must not be far from the user's location.

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

On the other hand, the method in which the electronic watch 1 receives location information and ephemeris from an external device such as the smartphone 2 can use valid location information even at the destination if the smartphone 2 retains the location information, which satisfies the hot start requirement. there is a possibility. If the user sets the location information acquisition setting of the GPS application on the smart phone 2 to "always allow", the GPS application periodically acquires location information. In this case, the smartphone 2 is likely to retain the user's most recent location information, and is likely to be able to perform a hot start.

However, if the user sets the acquisition setting of the location information of the GPS application to "not permitted" or "permitted only when using the application", the frequency with which the smartphone 2 can acquire the location information of the GPS application decreases. It may not hold location information. In that case, the electronic timepiece 1 more often holds the user's most recent location information than the smartphone 2 does.

Therefore, when the electronic timepiece 1 receives the position information from the smartphone 2, it also receives the time information when the position information was acquired, and compares the previous positioning time with the newer one (closer to the current time). Use location information. This processing makes it possible to perform positioning using the most recent position information, making it easier to perform a hot start. This processing is shown in FIG. 3, which will be described later.

However, even if new position information among the position information possessed by the electronic timepiece 1 and the smartphone 2 is adopted, it is not always easy to perform a hot start. For example, the position information measured by the smartphone 2 is the position information of a destination far away from the place where the user usually trains, and when the user returns from the destination at a later date, the following Even when positioning is performed, there is a risk that the position information obtained by positioning by the smartphone 2 will be used instead. In this case, since the latest location information possessed by the smartphone 2 is far from the place where the user usually trains, there is a possibility that a hot start cannot be performed. Therefore, in this case, it is better to use the new position information most recently measured by the electronic watch 1, which may hold the position information of the place where the user usually trains. In other words, even if the smartphone 2 has location information newly acquired compared to the electronic timepiece 1, if a certain amount of time has passed since the location information was acquired, the most recent position determined by the electronic timepiece 1 may be detected. Information is often better. Therefore, when the position information obtained by positioning by the smartphone 2 is used, the time at which the position information was obtained must be close to the current time to some extent. Therefore, in order to use the position information obtained by positioning by the smartphone 2, a condition of "when the positioning time of the position information obtained from the smartphone 2 is within a predetermined time from the current time" is added. This processing is shown in FIG. 4, which will be described later.

However, if the “predetermined time” is too short, it becomes difficult to use the location information determined by the smartphone 2 at the destination. Therefore, after giving a certain amount of time to the "predetermined time", the condition "when the predetermined distance is away" is added to the position information to be used by the electronic timepiece 1 in the next positioning. Determine the location information to be used during the next positioning. As a result, when conducting regular training, the electronic timepiece 1 can increase the probability of using new location information recently positioned by the GPS receiver. Furthermore, when the user trains or races at a destination far away from the place where the user usually trains, the electronic watch 1 uses the more effective location information obtained by the smart phone 2 to shorten the time required for GPS positioning. You can increase your chances.

FIGS. 3A and 3B are flowcharts of processing for the electronic timepiece 1 to acquire location information and predicted ephemeris information from the smartphone 2. FIG.
<<Processing of smartphone 2>>
By executing an application for interlocking with the electronic timepiece 1, the CPU 21 of the smartphone 2 acquires the location information (latitude and longitude) and Receives the time when the position was obtained.
The CPU 21 of the smartphone 2 determines whether or not the conditions for obtaining GPS information are satisfied after activation (S10). Here, the GPS information acquisition condition is, for example, the setting of the GPS application of the smart phone 2 . If the user has set the location information acquisition setting of the GPS application to "disallow", the GPS acquisition condition is not satisfied. If the user sets the location information acquisition setting of the GPS application to "permit only when using the application", the GPS information acquisition condition is established when the GPS application is used. If the user sets the location information acquisition setting of the GPS application on the smartphone 2 to "Always Permit", the GPS information acquisition condition is always satisfied. In addition, the condition is not limited to this, and apart from the setting of the GPS application, for example, the elapsed time since 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 position information and predicted ephemeris from 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 predicted ephemeris, which is orbit information obtained by predicting/estimating 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 timepiece 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, when the time zone switching notification is received from the smartphone 2 executing the application, and when the Bluetooth ( (Registered Trademark) Established at the timing of automatic time adjustment by Low Energy, at the time of starting an application for interlocking with the electronic clock 1 on the smartphone 2, and the like. As long as data can be received from the smart phone 2, the conditions are not limited to those described above.

If the connection condition with the electronic timepiece 1 is established (Yes), the CPU 21 transmits the acquired position information, the time of acquisition, and the predicted ephemeris to the electronic timepiece 1 (S13), and then returns to the process of step S10. If the connection condition with the electronic timepiece 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 positioning 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. Note that the method of obtaining the acquisition time of the position information is not limited. For example, the smart phone 2 may obtain the time using radio waves received from GPS satellites during GPS positioning, or may use the time clocked by the CPU 21 of the smart phone 2 . Alternatively, the time may be obtained by a combination of time measured by the CPU 21 of the smartphone 2 and information obtained from radio waves received from GPS satellites.

<<Processing of Electronic Clock 1>>
A process for the electronic timepiece 1 to receive the location information from the smartphone 2, the acquisition time of the location information acquired by the smartphone 2, and the predicted ephemeris will be described below. Flowcharts shown in FIGS. 3A, 3B, 4, and 5 below show processing when the CPU 11 executes the positioning control program stored in the memory 13. FIG. It should be noted that the initial values of the “next GPS reception time position use flag” and the “smartphone position use flag” immediately after the CPU 11 is started are OFF.

When the CPU 11 of the electronic timepiece 1 receives the location information, the acquisition time, and the predicted ephemeris transmitted in step S12 (S20), the received location information becomes the first location information acquired after the restart of the electronic timepiece 1. (S21). Here, restart includes all clear (AC), which is software initialization of the electronic timepiece 1, and battery all clear (BAC), which is restart due to a drop in the power supply voltage. If the location information received in step S20 is the location information acquired for the first time after the electronic timepiece 1 is restarted (AC) or the battery is all cleared (BAC) (Yes), the CPU 11 performs the processing of step S29 in FIG. 3B. proceed to

If the location information received in step S20 is not the location information acquired for the first time after the electronic timepiece 1 is restarted or the battery is all cleared (BAC) (No), the CPU 11 sets a "smartphone location use flag" (hereinafter referred to as 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 acquisition time of the location information by the smartphone 2 is newer than the previous acquisition time of the location information 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 for positioning. The time at which the smartphone 2 acquired the location information last time is stored in the memory 13 .
If the current acquisition time of the position information by the smartphone 2 is not closer to the current time than the previous acquisition time of the position information by the smartphone 2 (No), the CPU 11 ends the processes of FIGS. 3A and 3B.
If the current acquisition time of the smartphone location information is newer than the previous acquisition time of the smartphone location information (Yes), the CPU 11 proceeds to the process of step S25 in FIG. 3B.

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

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

For example, if the smartphone 2 acquires location information while the user is on a business trip, and the electronic clock 1 uses the location of the smartphone 2 after the user returns home, the location information far away from the current location of the user will be 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 provided depending on the application 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 terminates the processing 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 the GPS-IC 14 is within 75 km from the true value. However, the distance used as the determination condition is not limited to 75 km. For example, a distance other than 75 km may be used as a judgment condition according to the performance of the GPS-IC installed in 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). It should be noted that the "next GPS reception position use flag" indicates that the position information has been received after the restart.

In this embodiment, the CPU 21 updates the location information from the smartphone 2 stored in the memory 13 with the location information acquired from the smartphone this time (S30), and updates the smartphone location acquisition time (S31). It should be noted that the next time the electronic timepiece 1 performs positioning, it is sufficient that the position information obtained at the time closest to the current time is available. good. Furthermore, when the CPU 11 sets the predicted ephemeris in the flash memory 141 in the GPS-IC 14 (S32), the processing of FIGS. 3A and 3B ends.

3A and 3B, the electronic timepiece 1 can perform a hot start together with predicted ephemeris by inputting position information (latitude and longitude information) to the GPS-IC 14 before starting GPS reception. , the time to complete positioning can be greatly reduced.

FIG. 4 is a flowchart of processing for turning off the smartphone position use flag after 24 hours have passed since the smartphone 2 positioned itself. This process is executed, for example, each time the CPU 11 of the electronic timepiece 1 counts one hour, but is not limited to this, and may be executed, for example, every 10 minutes.
In step S40, the CPU 11 determines whether or not the "next GPS reception position use flag" is ON. The CPU 11 terminates the processing of FIG. 4 if the "next GPS reception position use flag" is OFF (No).

If the "next time GPS reception 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 processing 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 since the time when the smartphone 2 measured the position (position acquisition time). If it is within 24 hours from the position acquisition time of the smartphone 2 (No), the CPU 11 ends the processing of FIG. 4 .

If 24 hours have passed since 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. Use flag" is turned off.

5A and 5B are flowcharts of GPS reception processing by the electronic timepiece 1. FIG. This GPS reception process is started when the GPS-IC 14 receives radio waves from a GPS satellite, and executes a process (positioning operation) of acquiring position information based on the radio wave information of the satellite.

The CPU 11 changes the execution parameter address map of the GPS-IC 14 according to the determination results shown in steps S52 and S53 of FIG. Hot start setting and position information (latitude and longitude information) are written through writing.

At the beginning of the GPS reception processing by the electronic timepiece 1, the CPU 11 activates the GPS-IC 14 (S50). If the flash memory 141 does not hold a valid predicted ephemeris (S51→No), the CPU 11 proceeds to the process of step S54 and does not transmit the position information (latitude and longitude information) to the execution parameter map. This causes the GPS-IC 14 to cold start. Here, the case where valid predicted ephemeris is not held includes cases such as immediately after restarting the device or all-clearing the battery, and when the expiration date of the predicted ephemeris has passed after obtaining the predicted ephemeris. When step S54 is executed, since it is a cold start, the time required for positioning by the GPS-IC 14 is longer than positioning in steps S55 to 57, which will be described later.

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

If the "next time GPS reception position use flag" is OFF (No), the CPU 11 proceeds to the process of step S57 and does not transmit the position information (latitude and longitude information) to the execution parameter map. However, GPS-IC 14 can hot start because it has a valid predicted ephemeris. Since it is a hot start, the GPS-IC 14 takes less time for positioning than in step S54. Thereby, the CPU 11 can complete the positioning in a short time compared to the cold start setting in step S54. However, since positioning is performed without inputting position information (latitude and longitude information) to the execution parameter map, the time required for positioning is longer than in steps S55 and S56, which will be described later.

If the "next time GPS reception 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 and longitude information) measured by the smartphone 2 to the execution parameter map. Thereby, the GPS-IC 14 can be hot-started. Thereby, 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 and longitude information measured by the smartphone 2 to the execution parameter map. Thereby, the GPS-IC 14 can be hot-started. At this time, the time required for positioning by the GPS-IC 14 is approximately several seconds. Thereby, the CPU 11 can complete the positioning in a shorter time than the hot start setting in step S57.

After that, the GPS-IC 14 starts receiving GPS radio waves (S58), and the CPU 11 determines whether or not GPS reception was successful (S59). If the GPS reception fails (No), the CPU 11 terminates the processes of FIGS. 5A and 5B.

If the GPS reception by the GPS-IC 14 is successful (Yes), the CPU 11 proceeds to the process of step S60. The CPU 11 turns on the "next GPS reception position use flag" so that the acquired position information can be used at the next reception (S60), and turns off the "smartphone position use flag" (S61). After that, the CPU 11 terminates GPS reception by the GPS-IC 14 (S62). In this embodiment, the GPS location information is updated with the location information acquired this time by the GPS-IC 14 (S63). It should be noted that the next time the electronic timepiece 1 performs positioning, it is sufficient that the position information obtained at the time closest to the current time is available. good. After the process of step S63 ends, the process proceeds to step S64. Furthermore, when the CPU 11 updates the acquisition time of the GPS position information (S64), the processing of FIGS. 5A and 5B ends. Note that the method by which the CPU 11 obtains the acquisition time of the GPS position information is not limited. For example, the time information may be obtained from GPS radio waves, or may be obtained using the time clocked by the CPU 11 . Further, time information may be acquired by combining time information measured by the CPU 11 and information obtained from GPS radio waves.

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

(a) The electronic timepiece 1 of the above embodiment downloads predicted ephemeris together with location information from the smartphone 2 . However, it is not limited to this, and may be downloaded from the smartphone 2 under separate conditions.
(b) The present invention is not limited to the electronic timepiece 1 of the above embodiment, and may be applied to wearable devices in general.
(c) An external device that transmits position information and ephemeris to the electronic timepiece 1 is not limited to the smartphone 2, and may be any device that has a GPS positioning function.
(d) The storage of the predicted ephemeris is not limited to the flash memory, and may be a RAM (random access memory) within the GPS-IC. It may be in memory 13 .
(e) The communication method between the electronic watch 1 and the smartphone 2 is not limited to Bluetooth (registered trademark) Low Energy, but any wireless communication such as Wi-Fi (registered trademark), ZigBee (registered trademark), or IrDA. method may be used.
(f) Modifications may be made to the flow charts shown in FIGS. 3A-5B within the scope of achieving the same effect. For example, the order of steps S25 to S27 shown in FIG. 3B may be changed.

The invention described in the scope of claims originally attached to the application form of this application is additionally described below. The claim numbers in the appendix are as in the claims originally attached to the filing of this application.

[Appendix]
<<Claim 1>>
a positioning unit that performs a positioning operation using radio waves received from satellites and obtains first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
Communication that communicates with an external device to receive second position information that is position information of the external device, orbit information related to the satellite, and second time information that is the time when the external device acquires the second position information Department and
a control unit that measures the current time;
a storage unit that stores the first location information, the first time information, the second location information, and the second time information;
A wearable device comprising
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 when causing the positioning unit to perform the positioning operation. 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, transmitting the second position information and the trajectory information received from the external device to the positioning unit;
A wearable device characterized by:
<<Claim 2>>
The predetermined time is 24 hours,
The wearable device according to claim 1, characterized by:
<<Claim 3>>
The predetermined distance is 75 km,
3. The wearable device according to claim 1 or 2, characterized in that:
<<Claim 4>>
The positioning unit cold-starts if the trajectory information received from the external device is not valid, and hot-starts using the trajectory information if the trajectory information is valid.
The wearable device according to any one of claims 1 to 3, characterized in that:
<<Claim 5>>
a positioning unit performing positioning operation using radio waves received from satellites, and obtaining first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
A communication unit communicates with an external device to transmit second position information, which is position information of the external device, orbit information related to the satellite, and second time information, which is the time when the external device acquires the second position information. receiving;
a storage unit storing the first location information, the first time information, the second location information, and the second time information;
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 when the control unit causes the positioning unit to perform the positioning operation; 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. transmitting the second position information and the trajectory information received from the external device to the positioning unit if the information is within a predetermined time from the current time;
A positioning control method characterized by executing
<<Claim 6>>
to the computer,
a positioning unit performing positioning operation using radio waves received from satellites, and obtaining first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
A communication unit communicates with an external device to transmit second position information, which is position information of the external device, orbit information related to the satellite, and second time information, which is the time when the external device acquires the second position information. receiving;
a storage unit storing the first location information, the first time information, the second location information, and the second time information;
When causing the positioning unit to perform the 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 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 information stored in the storage unit is the current position. if within a predetermined time from the time, transmitting the second position information and the trajectory information received from the external device to the positioning unit;
Positioning control program for executing

1 Electronic watch (wearable device)
11 CPU (control unit)
12 display 13 memory (storage unit)
14 GPS-IC (Positioning part)
141 flash memory 15 short-range wireless communication unit (communication unit)
2 Smartphone (external device)
21 CPUs
22 display 23 memory 24 satellite radio wave receiving unit 25 near field wireless communication unit

Claims (6)

a positioning unit that performs a positioning operation using radio waves received from satellites and obtains first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
Communicate with an external device to receive second position information, which is position information measured by the external device, orbit information related to the satellite, and second time information, which is the time when the external device acquires the second position information a communication unit that
a control unit that measures the current time;
a storage unit that stores the first location information, the first time information, the second location information, and the second time information;
A wearable device comprising
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 when causing the positioning unit to perform the positioning operation. 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, transmitting the second position information and the trajectory information received from the external device to the positioning unit;
A wearable device characterized by: The predetermined time is 24 hours,
The wearable device according to claim 1, characterized by: The predetermined distance is 75 km,
3. The wearable device according to claim 1 or 2, characterized in that: The positioning unit cold-starts if the trajectory information received from the external device is not valid, and hot-starts using the trajectory information if the trajectory information is valid.
The wearable device according to any one of claims 1 to 3, characterized in that: the computer
a positioning unit performing positioning operation using radio waves received from satellites, and obtaining first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
A communication unit communicates with an external device, second position information that is position information measured by the external device, orbit information related to the satellite, and a second time that is the time when the external device acquires the second position information receiving information;
a storage unit storing the first location information, the first time information, the second location information, and the second time information;
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 when the control unit causes the positioning unit to perform the positioning operation; 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. transmitting the second position information and the trajectory information received from the external device to the positioning unit if the information is within a predetermined time from the current time;
A positioning control method characterized by executing to the computer,
a positioning unit performing positioning operation using radio waves received from satellites, and obtaining first position information that is the position of the device itself and first time information that is the time when the position of the device itself is acquired;
A communication unit communicates with an external device, second position information that is position information measured by the external device, orbit information related to the satellite, and a second time that is the time when the external device acquires the second position information receiving information;
a storage unit storing the first location information, the first time information, the second location information, and the second time information;
When causing the positioning unit to perform the 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 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 information stored in the storage unit is the current position. if within a predetermined time from the time, transmitting the second position information and the trajectory information received from the external device to the positioning unit;
Positioning control program for executing

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