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Satellite positioning apparatus

  • US 3,906,204 A
  • Filed: 04/20/1973
  • Issued: 09/16/1975
  • Est. Priority Date: 04/20/1973
  • Status: Expired due to Term
First Claim
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1. An apparatus for processing data, sent from a satellite in the form of a fixed frequency signal containing phase modulated pulse doublets or orbit definition data, to determine a position of a vehicle on the earth, comprising:

  • a. receiver means for receiving the signal from the satellite, said receiver means comprising;

    1. intermediate frequency means for domodulating the fixed frequency signal for processing;

    2. phase detector means for determining the phase of the demodulated signal from said intermediate frequency means;

    3. phase lock loop means receiving an output of said phase detector means for regulating the frequency of said intermediate frequency means;

    4. doppler demodulator means responsive to an output of said phase lock loop means for determining the doppler shift in frequency of the signal sent from the satellite;

    5. local oscillator means for forming a reference frequency signal;

    6. synthesizer means for forming demodulating frequency signals for said intermediate frequency means, said phase detector means, and said doppler demodulator means from said reference frequency signal;

    7. bit phase detector means for determining the phase of the orbit definition data phase doublets;

    8. bit rate phase lock loop means for contrOlling the phase of the orbit definition data pulse doublets; and

    9. data decoder means for decoding the orbit definition data from the phase modulated pulse doublets;

    b. computer means for processing the doppler shift and orbit definition data to determine the location of the vehicle;

    c. interface circuit means for providing the doppler shift and orbit definition data to said computer means, said interface circuit means including doppler counter means for counting the doppler shift; and

    d. display means for indicating the location of the vehicle determined by said computer means.

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