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System and method for dynamically estimating output variances for carrier-smoothing filters

  • US 7,609,204 B2
  • Filed: 08/30/2005
  • Issued: 10/27/2009
  • Est. Priority Date: 08/30/2005
  • Status: Active Grant
First Claim
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1. A method for dynamically estimating output variances for a smoothing filter, comprising the steps of:

  • receiving a signal at a receiver;

    defining a current output term for the smoothing filter;

    determining a total variance of the smoothing filter;

    determining a variance of said current output term of the smoothing filter;

    incrementally calculating said variance of said current output term of the smoothing filter;

    deriving a steady-state variance for an output of the smoothing filter;

    defining said steady-state variance as a function of a variance of an input pseudorange value (ρ

    ) and a variance of an input accumulated carrier phase value (∅

    ACC) of the smoothing filter; and

    filtering the received signal based upon at least the defined steady-state variance.

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