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Spread spectrum detector

  • US 4,122,393 A
  • Filed: 05/11/1977
  • Issued: 10/24/1978
  • Est. Priority Date: 05/11/1977
  • Status: Expired due to Term
First Claim
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1. A detector for use in a communication receiver in which a received coded signal is to be detected utilizing a locally generated similarly coded signal, comprising:

  • a first channel and a second channel;

    means for applying said received coded signal to said first channel and to said second channel;

    first correlation means included in said first channel for correlating said received coded signal with a generated coded signal received from said second channel to provide a detected received coded signal;

    means responsive to said detected received coded signal for providing a lock indication signal when the degree of synchronization between said generated coded signal and said received coded signal is within a desired range;

    local means included in said second channel for generating a coded signal and a dithered coded signal in response to a control signal;

    second correlation means adapted to receive said received coded signal and said generated dithered coded signal, said second correlation means providing a signal indicative of the degree of synchronization between said received coded signal and said generated dithered coded signal; and

    means responsive to said provided signal from said second correlation means for generating said control signal and for providing said control signal to said local means so as to drive said dithered coded signal into synchronization with said received coded signal.

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