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Signal timing synchronizer

  • US 5,402,450 A
  • Filed: 01/22/1992
  • Issued: 03/28/1995
  • Est. Priority Date: 01/22/1992
  • Status: Expired due to Term
First Claim
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1. Apparatus for synchronizing to a reference signal the timing of a received composite signal that includes a transmitted coded signal and at least one multipath signal, the apparatus comprising:

  • conversion means for converting said received composite signal into two orthogonally related signals;

    first correlation means for determining a first time point corresponding to a maximum amplitude of a waveform formed as a correlation signal between a reference signal and the received composite signal, wherein said waveform is related to the orthogonally converted signals;

    second correlation means for determining a second time point on the waveform having an amplitude that is a predetermined factor k of the maximum amplitude determined by the first correlation means;

    wherein said first and second correlation means each include first and second code clock generators and first and second local code generators, where the timing of output signals from the first local code generator and from the second local code generator are controlled independently of each other;

    microprocessor means for determining a computed difference in time between said second time point and said first time point; and

    calculation means for calculating a time of occurrence of a peak value of said transmitted coded signal that would occur if no multipath signal is present based on said first time point and on said computed time difference.

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