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Integrity monitoring in a position location system utilizing knowledge of local topography

  • US 20040192330A1
  • Filed: 04/18/2002
  • Published: 09/30/2004
  • Est. Priority Date: 04/18/2002
  • Status: Active Grant
First Claim
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1. A method of deriving a position estimate of a receiver from a plurality of parameter measurements, each derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:

  • deriving a plurality of position estimates, each from a different subset of the plurality of measurements;

    deriving a cost of each of the position estimates;

    refining the costs based on local topography; and

    selecting one of the position estimates responsive to the refined costs.

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