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Signal detector employing a doppler phase correction system

  • US 6,931,055 B1
  • Filed: 04/18/2000
  • Issued: 08/16/2005
  • Est. Priority Date: 04/18/2000
  • Status: Expired due to Fees
First Claim
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1. A method for a spread spectrum detector, comprising the steps of:

  • receiving a spread spectrum modulated signal having a Doppler shift error imposed by movement between a signal source and a receiver, producing a plurality of complex first correlation values based upon the signal, a doppler shift, and a code;

    generating a plurality of complex second correlation values respectively from the first correlation values using a fast fourier transform (FFT), wherein generating includes combining a correction for the Doppler shift error with each of the first correlation values to produce the second correlation values; and

    integrating the second correlation values to derive a complex third correlation value that indicates a degree of correspondence of the code with the signal.

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