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Method and system for processing positioning signals based on predetermined message data segment

  • US 20040041728A1
  • Filed: 05/23/2003
  • Published: 03/04/2004
  • Est. Priority Date: 07/18/2001
  • Status: Active Grant
First Claim
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1. A method for processing positioning signals in a ranging receiver using predetermined message data bit sequences, comprising:

  • collecting signal samples from positioning signals received at the ranging receiver from a plurality of transmitters, the signal samples comprising message data modulation, each transmitter having an associated identification code;

    selecting a pre-determined carrier frequency offset (CFO) from a plurality of CFOs;

    designating an epoch of a signal sample as a first epoch of a predetermined message data segment, contained within the sample;

    compensating the signal sample for the selected CFO;

    removing the message data modulation from the signal sample;

    determining whether an adequate correlation peak exists for the designated epoch; and

    when an adequate correlation peak exists, determining a time-of-arrival for the predetermined message data segment at the ranging receiver based on the adequate correlation peak.

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