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Cell organization and transmission schemes in a wide area positioning system (WAPS)

  • US 9,291,712 B2
  • Filed: 08/02/2012
  • Issued: 03/22/2016
  • Est. Priority Date: 09/10/2009
  • Status: Active Grant
First Claim
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1. A position location system comprising:

  • a plurality of transmitters,each of the plurality of transmitters are at different locations and are operable to transmit a positioning signal that includes a pseudorandom ranging signal modulated on a carrier having one carrier frequency selected from a finite set of values,the plurality of transmitters including two transmitters that are operable to concurrently transmit two positioning signals,a first of the two transmitters operable to transmit a first of the two positioning signals that includes a pseudorandom ranging signal modulated on one carrier having a first carrier frequency, anda second of the two transmitters operable to transmit a second of the two positioning signals that includes a pseudorandom ranging signal modulated on one carrier having a second carrier frequency that is offset from the first carrier frequency by an offset that is less than or equal to twenty-five percent of the bandwidth of each positioning signal of the two positioning signals.

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