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System and method for determining relative differential positioning system measurement solutions

  • US 7,142,982 B2
  • Filed: 09/13/2004
  • Issued: 11/28/2006
  • Est. Priority Date: 09/13/2004
  • Status: Active Grant
First Claim
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1. A method for determining which alternative path a vehicle has taken comprising the steps of:

  • determining, prior to encountering a divergence point on a fixed path, a first vector between a first point on a fixed path and a vehicle position reported by a positioning system, the divergence point being a point at which the fixed path diverges into a plurality of branches;

    determining, after the vehicle has passed the divergence point, a second vector between a vehicle position reported by the positioning system and a second point, the second point being a point on one of the branches; and

    determining which of the branches the vehicle is on based at least in part on a comparison of the first vector and the second vector.

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