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Method and apparatus for improved autocorrelation in biphase modulated pseudorandom noise coded systems using tri-state demodulation

  • US 5,930,292 A
  • Filed: 04/21/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 04/21/1997
  • Status: Expired due to Fees
First Claim
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1. A tri-state correlator, responsive to a sequence of data words, for correlating a biphase modulated signal, comprising:

  • a multiplexer having a control input responsive to a sequence of tri-state code words each having one of three distinct states, said multiplexer also having first, second and third inputs respectively responsive to said sequence of data words, an inversion of said sequence of data words, and a zero data word, said multiplexer having an output for providing a sequence of multiplexer output words based upon the state of said tri-state code words appearing at said control input; and

    a filter for filtering said multiplexer output words.

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