Satellite receiver system having doppler frequency shift trackin

Details Satellite receiver system having doppler frequency shift trackin Satellite receiver system having doppler frequency shift trackin

1994-01-14

1995-07-11

Blum, Theodore M.

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

Directive

Including a satellite

455 121, H04B 7185, G01S 502

Patent

active

054325218

ABSTRACT:
A satellite receiver system provides acquisition and frequency tracking of a Doppler-shifted radio signal received from an orbiting satellite. The satellite receiver system includes a Costas phase-lock loop that receives the radio signal and provides an error signal at an error signal output for controlling a conversion frequency generated by a voltage controlled oscillator. The voltage controlled oscillator is coupled to the Costas phase-lock loop and generates the conversion frequency for down-converting the radio signal in the Costas phase-lock loop. The satellite receiver system further includes a Doppler frequency acquisition and tracking element coupled to the voltage controlled oscillator. The Doppler frequency acquisition and tracking element adjusts the conversion frequency to compensate for a Doppler frequency shift occurring in the radio signal due to orbital motion of the orbiting satellite.

REFERENCES:
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patent: 5008952 (1991-04-01), Davis et al.
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patent: 5129095 (1992-07-01), Davis et al.
patent: 5239670 (1993-08-01), Schwendeman et al.
R. E. Ziemer and W. H. Tranter, Principles of Communications Systems, Modulation, and Noise, pp. 170-171, 1985, U.S.A.

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