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Code multipath error estimation using weighted correlations

  • US 5,966,403 A
  • Filed: 07/19/1996
  • Issued: 10/12/1999
  • Est. Priority Date: 07/19/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for use in decoding a composite signal (CS) that includes a distortion component, said apparatus comprising:

  • an input means for down converting to baseband an input satellite signal;

    a first reference means for generating a first reference signal;

    a first weighting means connected to said first reference means for generating a time varying first weighting signal, wherein said first weighting signal is mixed with said composite signal and with said first reference signal;

    a first correlation means connected to said first weighting means for generating a first correlation signal, wherein said first correlation signal includes a suppressed distortion component, and wherein said first correlation signal includes a residual distortion component;

    a second reference means connected to said input circuit for generating a second reference signal;

    a second weighting means connected to said second reference means for generating a time varying second weighting signal, wherein said second weighting signal is mixed with said composite signal and with said second reference signal;

    a second correlation means connected to said second weighting means for generating a second correlation signal; and

    a computer means connected to said first correlation means and connected to said second correlation means for closing the code and carrier tracking loops, for actual estimation of said residual distortion signal in said first correlation signal, and for actual minimization of said residual distortion signal in said first correlation signal.

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