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Method of determining the position of a vehicle moving along a guideway

  • US 9,085,310 B2
  • Filed: 05/25/2011
  • Issued: 07/21/2015
  • Est. Priority Date: 05/25/2011
  • Status: Active Grant
First Claim
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1. A method of determining a position of a vehicle moving along a guideway, comprising:

  • detecting signals from each of a plurality of localized groups of transponders located beside the guideway as the vehicle moves along the guideway, each localized group being located at a detection location, the individual transponders within each said localized group being spaced a known distance apart from each other, said localized groups being spaced substantially further apart from each other than the individual transponders within each said localized group, wherein as the vehicle passes a current said detection location, the signals from each transponder within the localized group at the current detection location create a footprint in a time domain corresponding to a time the vehicle is in communication with that transponder;

    identifying a point in a spatial domain between the transponders that bears a known geometric relationship with the transponders of each localized group; and

    computing an estimate of the position of the moving vehicle by matching a point in the time domain that bears the same geometric relationship to the footprints of the transponders of the localized group at the current detection location as the point in the spatial domain bears with the transponders of the localized group at the current detection location.

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