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Navigation system and method

  • US 9,689,963 B2
  • Filed: 06/18/2015
  • Issued: 06/27/2017
  • Est. Priority Date: 08/31/2012
  • Status: Active Grant
First Claim
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1. A vehicle navigation system, comprising:

  • at least two vehicle mounted radio frequency transceivers spaced apart from one another on a vehicle;

    a plurality of reference devices to place at a plurality of fixed terrestrial reference locations, to define a circumference of a navigation area, wherein each reference device includes a fixed radio frequency transceiver to interact with the vehicle mounted radio frequency transceivers and with the other reference devices of the plurality of reference devices;

    a calibration system located on the plurality of reference devices, wherein a location error between the plurality of reference devices is tracked and used to calibrate actual locations of the plurality of reference devices and the at least two vehicle mounted radio frequency transceivers within the navigation area; and

    wherein the calibration system is configured to track an electronic drift in position of the plurality of reference devices at fixed terrestrial reference locations, and use the electronic drift to provide calibration for the actual locations.

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