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Sequencer for a shared channel global positioning system receiver

  • US 5,192,957 A
  • Filed: 07/01/1991
  • Issued: 03/09/1993
  • Est. Priority Date: 07/01/1991
  • Status: Expired due to Term
First Claim
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1. A shared channel Global Positioning System (GPS) receiver for receiving a plurality of coded satellite signals from a plurality of satellites, said signals exhibiting Doppler shifting, said GPS receiver comprising:

  • means for converting said coded satellite signals to intermediate frequency signals;

    A/D means coupled to said means for converting, said A/D means for simultaneously translating said intermediate frequency signals for said plurality of coded satellite signals to a plurality of digital signals;

    correlation means coupled to said A/D means, said correlation means for simultaneously separating each of said plurality of digital signals corresponding to each said satellite to provide channel information signals for each said satellite;

    channel means coupled to said correlation means, said channel means for estimating a plurality of parameters describing each satellite'"'"'s expected position and an expected frequency of transmission of said coded satellite signals including Doppler compensation for each of said plurality of said satellites on a time division multiplexed basis; and

    processor means coupled to said correlation means and to said channel means, said processor means for retrieving information transmitted from each of said satellites in response to channel information signals.

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