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Enhanced L1/L2 code channel for global positioning system receivers

  • US 5,245,628 A
  • Filed: 03/29/1991
  • Issued: 09/14/1993
  • Est. Priority Date: 03/29/1991
  • Status: Expired due to Term
First Claim
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1. A P-code channel used in a GPS receiver for simultaneously tracking spread spectrum signals transmitted from a plurality of GPS satellites over L1 and L2 frequency bands comprising:

  • a P-code clock generator for generating a first and a second clock signal, said first clock signal associated with the L1 frequency band and said second clock signal associated with the L2 frequency band, said first and second clock signals having the same frequency but different phases;

    circuitry coupled to said P-code clock generator for generating a plurality of P-code chips and storing a plurality of the most recently generated of said P-code chips;

    a first circuit for selecting a P-code from said stored plurality of P-code chips, said selected P-code being in phase with said first clock signal; and

    a second circuit for selecting a P-code from said stored plurality of P-code chips, said selected P-code being in phase with said second clock signal.

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