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Local-area position navigation system with fixed pseudolite reference transmitters

  • US 5,686,924 A
  • Filed: 05/30/1995
  • Issued: 11/11/1997
  • Est. Priority Date: 05/30/1995
  • Status: Expired due to Fees
First Claim
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1. A local area navigation system, comprising:

  • a plurality of fixed-location pseudolites with carrier transmitters for transmitting a modulated carrier signal representative of respective physical positions of each pseudolite; and

    a mobile navigation receiver connected to receive modulated carrier signals from a combination of orbiting navigation satellites and the plurality of fixed location pseudolites, and connected to demodulate from each said modulated carrier signal and derive range information to each to determine a position for the navigation receiver;

    wherein, each of said pseudolites includes a position information modulator connected to provide spread-spectrum coded coordinate information that describes a fixed position of the pseudolite and that supplements or substitutes information obtained from said orbiting navigation satellites.

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