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Pseudo-random-number-code-detection and tracking system

  • US 4,203,071 A
  • Filed: 08/08/1978
  • Issued: 05/13/1980
  • Est. Priority Date: 08/08/1978
  • Status: Expired due to Term
First Claim
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1. A pseudo-random-number code detection and tracking system comprisingmeans for receiving a transmitted coded signal;

  • means for generating a local coded feedback signal;

    detector means having non-linear response characteristics responsive to said coded received signal and to said local coded signal and including means for comparing said received and local signals to produce an error signal when said received and local signals are not aligned;

    means responsive to said error signal for controlling the operation of said local coded feedback signal generating means to vary the characteristics of said local coded feedback signal so as to cause said signals to become aligned and, thereby, to minimize said error signal;

    control means, responsive to the statistical characteristics of said error signal, capable of dynamically changing the non-linear response characteristics of said detector means so that said response is substantially linear over a firt selected range of the error signal levels and is substantially constant over a second selected range of error signal levels, whereby said local coded signal and said received coded signal remain substantially aligned over a controllable range of error signal levels; and

    wherein said control means includes means for dynamically varying said second selected range.

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