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Method and apparatus for receiving GPS/GLONASS signals

  • US 6,967,992 B1
  • Filed: 11/19/1998
  • Issued: 11/22/2005
  • Est. Priority Date: 11/19/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus for processing L1 and L2 spread spectrum signals received from at least one satellite of a global positioning system, wherein each of the spread spectrum signals includes a unique frequency carrier with a known pseudo-random known code modulated thereon, each L1 and L2 signal being converted into a plurality of digital signals, the apparatus comprising:

  • a generator for generating a single replica of the known code;

    a delay line connected to the generator, the delay line having a plurality of taps wherefrom the known code replica is available at different relative phases thereof;

    a first demodulator connected to the generator for demodulating the converted L1 and L2 signals with the single replica of the known code without any substantial delay, the first demodulator output being associated with the L1 signal;

    a second demodulator selectably connectable to any one of the taps of the delay line for demodulating the converted L1 and L2 signals with a delayed replica of the known code, the second demodulator output being associated with the L2 signal; and

    switches for selectably switching the converted L1 and L2 signals for demodulation by the second demodulator, and selectably switching the converted L1 and L2 signals for demodulation by the first demodulator.

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