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Land-based local ranging signal methods and systems

  • US 7,345,627 B2
  • Filed: 08/18/2006
  • Issued: 03/18/2008
  • Est. Priority Date: 07/30/2004
  • Status: Active Grant
First Claim
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1. In a method for determining relative position of a receiver from ranging signals transmitted from stationary land-based transmitters, an improvement comprising:

  • (a) determining the position to within sub-meter accuracy with differential ranging of the ranging signals from the land-based transmitters along line-of-sight to the receiver and ranging signals from the land-based transmitters along line-of-sight to a reference station, the ranging signals being at a substantially same center frequency, the determination being free of required movement of the receiver.

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