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Pseudorandom-noise receiver having automatic switching between regular and anti-jamming modes

  • US 5,734,674 A
  • Filed: 10/02/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 11/28/1990
  • Status: Expired due to Term
First Claim
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1. A spread-spectrum receiver comprising:

  • A) input circuitry that receives receiver input signals, processes them, and takes raw samples of the results;

    B) digitizing circuitry, alternatively operable in anti-jamming and regular modes, for;

    i) deriving sample values from the raw samples by comparing them with quantization thresholds that define quantization intervals into which the samples fall and assigning to them sample values indicative of those quantization intervals in accordance with a regular mapping function when the digitizing circuitry is in the regular mode and in accordance with a different, anti-jamming mapping function when the digitizing circuitry is in the anti-jamming mode; and

    ii) generating a sample-value signal that represents sample values thus derived;

    C) a pseudorandom-sequence generator that generates a pseudorandom-sequence signal that represents a pseudorandom sequence;

    D) a correlator that generates a correlator output signal by performing a correlation operation in accordance with the sample-value and pseudorandom-sequence signals; and

    E) mode-control circuitry for automatically switching the digitizing circuitry between its regular and anti-jamming modes.

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