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Timekeeping device and satellite signal reception method for a timekeeping device

A timing device and satellite signal technology, applied in the field of satellite signal reception, can solve the problems of longer reception time and increased power consumption, and achieve the effects of preventing continued useless reception, reducing power consumption, and improving acquisition probability

Inactive Publication Date: 2009-06-24
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, there is a high possibility that the signal from the captured GPS satellite cannot be received because the signal from the captured GPS satellite is weak, or the route of the receiving user is changed when receiving while moving, or it is under the shadow of a high-rise building. , it is necessary to re-search GPS satellites each time, resulting in longer overall receiving time and increased power consumption

Method used

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  • Timekeeping device and satellite signal reception method for a timekeeping device
  • Timekeeping device and satellite signal reception method for a timekeeping device
  • Timekeeping device and satellite signal reception method for a timekeeping device

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no. 1 Embodiment approach

[0112] figure 1 It is a schematic diagram showing a timekeeping device according to the present invention, that is, a wristwatch 1 with a GPS satellite signal receiving device (hereinafter referred to as "wristwatch with GPS 1"). figure 2 It is a block diagram showing the main hardware configuration and the like of the GPS wristwatch 1 .

[0113] Such as figure 1 As shown, the wristwatch 1 with GPS has a time display portion composed of a dial 2 and hands 3 . An opening is formed in part of the dial 2, and a display 4 composed of an LCD display panel or the like is mounted therein.

[0114] The hands 3 are configured to have a second hand, a minute hand, an hour hand, etc., and are driven by a stepping motor through gears.

[0115] The display 4 is composed of an LCD display panel and the like, and besides displaying positional information such as latitude, longitude and city name, also displays message information.

[0116] Furthermore, the GPS wristwatch 1 is configured...

no. 2 Embodiment approach

[0214] Next, a second embodiment of the present invention will be described. In addition, in each of the following embodiments, the same symbols are assigned to the same or similar configurations as those in the other embodiments described above, and descriptions are omitted or simplified.

[0215] The second embodiment is as Figure 8 As shown in the flow chart of , the difference from the aforementioned first embodiment is that the overtime judgment time of the decoding time is set according to the value of the reception level; and when the decoding time is overtime in a satellite mode, by The reception channel setting unit 54 shifts to the multi-channel mode without stopping the GPS reception, and other processes and circuit configurations are the same as those of the first embodiment.

[0216] Hereinafter, regarding the processing flow of the second embodiment, mainly refer to Figure 8 Portions different from those of the first embodiment will be described.

[0217] ex...

no. 3 Embodiment approach

[0231] Next, a third embodiment of the present invention will be described.

[0232] The third embodiment is as Figure 9 As shown in the flow chart of , it is different from the aforementioned first embodiment in that it is determined whether the fluctuation range of the reception level per unit time is within a preset predetermined range (S41), and when it exceeds the predetermined range, it transfers to In the multi-channel mode, other processes and circuit configurations are the same as those of the first embodiment.

[0233] Hereinafter, regarding the processing flow of the third embodiment, mainly refer to Figure 9 Portions different from those of the first embodiment will be described.

[0234] exist Figure 9 In the above, each process of S11 to S27 is the same as that of the first embodiment, so description thereof will be omitted.

[0235] Furthermore, in the third embodiment, between S17 and S24, the signal state detection unit 52 judges whether or not the fluc...

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Abstract

The invention provides a timekeeping device capable of receiving satellite signals in a short time, reducing power consumption, reducing the influence of reception condition and increasing successful reception probability. A watch with GPS has a reception unit that captures the GPS satellite and receives the satellite signals, a time information generating unit that generates time information based on the satellite signal received by the reception unit, a time display unit that displays time information, and a reception control unit (50). The reception control unit (50) includes a satellite capture control unit (51) that controls the reception unit to run the GPS satellite capture process, a signal condition detection unit (52) that detects the signal condition of the captured GPS satellite, a decoding control unit (53) that controls the reception unit to apply a decoding process to the satellite signal transmitted from the captured GPS satellite, and a reception channel setting unit (54) that sets the reception unit to a single satellite mode or a multi-channel mode based on the signal condition detected by the signal condition detection unit (53).

Description

technical field [0001] The present invention relates to a timekeeping device and a satellite signal receiving method of the timekeeping device which receive radio waves transmitted from positioning satellites such as GPS satellites to obtain the current date and time. Background technique [0002] In the GPS (Global Positioning System), which is a system for measuring its own position, GPS satellites orbiting the earth are used, and atomic clocks are installed in the GPS satellites. Therefore, GPS satellites have extremely accurate time information (GPS time, satellite time information). [0003] An electronic timepiece that performs time correction using the time information (GPS time) of the GPS satellites has been proposed (Patent Document 1). [0004] Signals (navigation messages) from GPS satellites are transmitted in frames or subframes in synchronization with the reset of the C / A code (Coarse and Acquisition Code) at the beginning of one week of GPS time. Therefore,...

Claims

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Application Information

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IPC IPC(8): G04G7/02G04G5/00G01S5/14G01S19/14G01S19/28G01S19/32G01S19/34G04R20/02
Inventor 松崎淳
Owner SEIKO EPSON CORP
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