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GNSS Signal Processing Methods and Apparatus with Ambiguity Selection

  • US 20110140959A1
  • Filed: 08/05/2009
  • Published: 06/16/2011
  • Est. Priority Date: 08/19/2008
  • Status: Active Grant
First Claim
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1. Method to estimate parameters derived from global navigational satellite system (GNSS) signals useful to determine a position, comprisingobtaining observations of a GNSS signal from each of a plurality of GNSS satellites;

  • feeding the observations to a filter having a state vector at least comprising a float ambiguity for each received frequency of the GNSS signals, each float ambiguity constituting a real number estimate associated with an integer number of wavelengths of the GNSS signal between a receiver of the GNSS signal and the GNSS satellite from which it is received, and the filter being for estimating a float value for each float ambiguity of the state vector;

    selecting a subset of the ambiguities of the state vector;

    assigning integer values to the estimated float values of the float ambiguities of the subset to define a plurality of candidate sets;

    determining a quality measure for each of the candidate sets; and

    forming a weighted average of the candidate sets.

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