Method for obtaining precise intermediate frequency of...

Details Method for obtaining precise intermediate frequency of... Method for obtaining precise intermediate frequency of...

2011-04-12

2011-04-12

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a satellite

Reexamination Certificate

active

07924222

ABSTRACT:
A method for obtaining a precise intermediate frequency for a global positioning system (GPS) is applied in a GPS receiver having a radio frequency (RF) module. Using a satellite signal received by the RF module, ephemeris data of a satellite is completely obtained, and present coordinate of the GPS receiver is calculated. First coordinate of the satellite at first time point and second coordinate of the satellite at second time point are calculated using the ephemeris data. Then, traveling speed of the satellite and projection value of the traveling speed on position vector from the first coordinate to the present coordinate are calculated using the first time point, the first coordinate, the second time point, and the second coordinate. Finally, the precise intermediate frequency is calculated using the signal frequency, a carrier frequency of the satellite, the projection value, and velocity of light.

REFERENCES:
patent: 6167347 (2000-12-01), Lin
patent: 6266584 (2001-07-01), Hur-Diaz et al.
patent: 6424890 (2002-07-01), Syrjarinne et al.
patent: 6429808 (2002-08-01), King et al.
patent: 7567208 (2009-07-01), Mo et al.

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