Spread spectrum receiver with fast signal reacquisition

  • US 5,897,605 A
  • Filed: 04/25/1996
  • Issued: 04/27/1999
  • Est. Priority Date: 03/15/1996
  • Status: Expired due to Term
First Claim
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1. A method of tracking a spread spectrum source, comprising the steps of:

  • acquiring the source from a composite of signals received by determining a delay parameter for that source related to time of receipt of a source specific spread spectrum code in the signals from the source;

    correlating signals received from the source with a prompt version of a locally generated source specific code based on the delay parameter;

    tracking the signals received from the source by updating the delay parameter in response to the signals from the source;

    modeling the delay parameter to continue updating the delay parameter when signals from the source are not being tracked; and

    continuously correlating the composite of signals received with a plurality of delayed versions of the locally generated source specific code based on the modeled delay parameter to reacquire the signals from the source.

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