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Pseudolite-augmented GPS for locating wireless telephones

  • US 6,771,625 B1
  • Filed: 07/10/2000
  • Issued: 08/03/2004
  • Est. Priority Date: 07/10/1997
  • Status: Expired due to Term
First Claim
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1. A geolocation system for augmenting the Global Positioning System with a network of pseudolites, comprising:

  • at least three binary code signal sources wherein at least one of said binary code signal sources is a pseudolite capable of transmitting binary code signals on at least one radio frequency not used by the Global Positioning System, said pseudolite transmitting binary code signals according to a time division multiplexing system, said binary code signals being receivable by a mobile receiver whose location is to be determined; and

    means for interleaving the binary code signals of said binary code signal sources wherein a different binary code signal broadcast slot is assigned to each of said binary code signal sources.

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