Importance

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Abstract

A GPS receiver has a plurality of data demodulator circuits assigned to a plurality of GPS satellites, respectively, and a data memory which stores detailed orbit information of the GPS satellites. The GPS receiver searches for satellites the detailed orbit information of which was stored in the memory previously. When these searched GPS satellites are acquired, the GPS receiver executes satellite frame synchronization determination processing to check for an agreement among predetermined data included in satellite data transmitted from the acquired GPS satellites. When the searched GPS satellites cannot be acquired or the predetermined data do not agree, the GPS receiver executes a single-satellite frame synchronization determination processing to check for an agreement of predetermined data included in a plurality of frames of the satellite data. The GPS receiver starts positioning processing in response to an establishment of agreement to calculate its position.

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First Claim