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Receiving device for receiving and demodulating spread spectrum-modulated GPS wave

  • US 5,402,442 A
  • Filed: 06/27/1994
  • Issued: 03/28/1995
  • Est. Priority Date: 06/28/1993
  • Status: Expired due to Fees
First Claim
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1. A receiving device for receiving and demodulating spread spectrum-modulated GPS electromagnetic waves from GPS satellites comprising:

  • C/A code generator means for generating a C/A code corresponding to that of an aimed GPS satellite on a basis of a clock signal;

    frequency conversion means for converting said received GPS electromagnetic wave into at least one intermediate frequency signal by means of a local oscillation signal;

    despread-demodulation means for obtaining a PSK signal by performing a despread-demodulation by multiplying said intermediate frequency signal with said C/A code;

    carrier reproduction means for reproducing a carrier of the PSK signal from said PSK signal;

    clock signal generator means for generating a clock signal from said reproduced carrier and said local oscillation signal and supplying said clock signal to said C/A code generator means; and

    demodulation means for demodulating GPS data from a frequency of said reproduced carrier and said PSK signal.

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