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Self-calibrating threshold detector

  • US 4,241,312 A
  • Filed: 07/27/1979
  • Issued: 12/23/1980
  • Est. Priority Date: 07/27/1979
  • Status: Expired due to Term
First Claim
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1. In a system for receiving an incoming signal modulated by a prescribed code, the combination comprising:

  • a. a correlator receiving said incoming code and successively cross-correlating same with a local replica of said incoming code and with an incorrect code, said correlator producing during one time interval a reference signal corresponding to the correlation with said incorrect code, and further producing during a successive time interval an output signal corresponding to the correlation with said replica code;

    b. hold means holding a sample of said reference signal; and

    c. comparator means comparing said sample reference signal with said output signal to provide a resultant difference signal indicative of said correlation with said replica code.

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