GPS receiver apparatus and information acquisition method...

Details GPS receiver apparatus and information acquisition method... GPS receiver apparatus and information acquisition method...

2009-05-28

2011-10-25

Tarcza, Thomas (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357630

Reexamination Certificate

active

08044855

ABSTRACT:
The first reception operation is started in response to an acquisition request. Power supply to a RF unit and a demodulator is stopped after synchronization with the GPS signal is established. Based on information acquired from a sub-frame in the GPS signal, a time point to start the second reception operation is determined. Elapsed time is counted using a counter clock synchronized with transmission timing of the navigation message, while a reception frequency of the satellite, a PRN code unique to the satellite, and a frequency and a phase of the PRN code are retained. When the elapsed time arrives at the time point, the power supply to the RF unit and the demodulator is restarted.

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Japanese Office Action for 2008-155519 mailed on Nov. 16, 2010.
Japanese Office Action for 2008-155519 mailed on Apr. 27, 2010.

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