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NOISE ERROR CORRECTING AND EXCESSIVE NOISE REJECTING SYSTEM

  • US 3,701,102 A
  • Filed: 05/03/1971
  • Issued: 10/24/1972
  • Est. Priority Date: 05/03/1971
  • Status: Expired due to Term
First Claim
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1. An excessive noise rejecting system for use in a symbol identification interrogation system which utilizes consecutive frequency swept transmitted signals and returned signals at predetermined frequencies determined by an object radiated, every identification symbol being comprised of M bits in N bit positions, wherein N is a larger number than M, comprising;

  • means for receiving returned signals on said consecutive frequency sweeps and converting said signals to frequency sweep signal pulses on each sweep, respectively;

    means for counting the number of signal pulses in the N bit positions of each symbol;

    means for generating an excessive noise signal when the count of the number of each frequency sweep signal pulses exceeds a predetermined number; and

    means for rejecting the frequency sweep signal pulse data upon generation of said excessive noise signal.

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