Method of acquiring error correction value of reference...

Details Method of acquiring error correction value of reference... Method of acquiring error correction value of reference...

2007-08-29

2010-06-22

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a satellite

Reexamination Certificate

active

07741995

ABSTRACT:
A terminal device receives satellite signals from a plurality of satellite positioning system (SPS) satellites and locates a position. The terminal device periodically calculates a first drift df1of a local oscillator using a reference frequency Hr, calculates a search range of the satellite signal using the first drift df1, calculates a second drift df2of the local oscillator using a reception frequency of the satellite signal, calculates a reference frequency error β which is an error of the reference frequency by calculating a difference between the first drift df1and the second drift df2, and calculates an error correction value βav of the reference frequency by subjecting a plurality of the reference frequency errors β to a statistical process.

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