Satellite signal reception device, timekeeping device, and satellite signal reception method

1. A satellite signal reception device, comprising:

a reception operation unit that executes a reception process to receive a satellite signal transmitted from a positioning information satellite;

the satellite signal having a repeating information period including a first sub-period containing satellite correction information, a second sub-period containing precise orbit information, and a third sub-period containing coarse orbit information,

wherein the reception operation unit executes the reception process in the second sub-period, suspends at least part of the reception process in the third sub-period, executes the reception process in a first occurrence of the first sub-period, and suspends at least part of the reception process in subsequent first sub-periods.

2. The satellite signal reception device described in claim 1 , wherein:

the reception operation unit executes a positioning information generating process to generate positioning information based on the precise orbit information contained in the satellite signal.

3. The satellite signal reception device described in claim 2 , wherein:

the reception operation unit suspends at least part of the positioning information generating process in the third sub-period and in the subsequent first sub-periods.

4. The satellite signal reception device described in claim 2 , further comprising:

a first storage unit that stores first data required for the reception process,

wherein the first storage unit stores the first data during the third sub-period and the subsequent first sub-periods.

5. The satellite signal reception device described in claim 4 , wherein:

the first data includes at least one of frequency offset data, pseudorange data, the precise orbit information, satellite time data, and the satellite correction information for the positioning information satellite from which a satellite signal is received.

6. The satellite signal reception device described in claim 1 , further comprising:

a second storage unit;

wherein the reception operation unit executing a coarse orbit information generating process that generates second data corresponding to the coarse orbit information from the precise orbit information, and

the second storage unit stores the second data corresponding to the coarse orbit information.

7. The satellite signal reception device described in claim 1 , wherein:

the positioning information satellite is a GPS satellite.

8. A timekeeping device comprising the satellite signal reception device described in claim 2 , the timekeeping device further comprising:

a timekeeping unit that keeps internal time information; and

a time adjustment unit that corrects the internal time information;

wherein the reception operation unit generates time-zone difference adjustment information based on the positioning information; and

the time adjustment unit corrects the internal time information based on the time-zone difference adjustment information.

9. A satellite signal reception method that receives a satellite signal transmitted from a positioning information satellite, the satellite signal having a repeating information period including a first sub-period containing satellite correction information, a second sub-period containing precise orbit information, and a third sub-period containing coarse orbit information, the satellite signal reception method comprising:

executing a reception process in a first occurrence of the first sub-period and in the second sub-period; and

suspending at least part of the reception process in the third sub-period and suspending at least part of the reception process in the subsequent first sub-periods.