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Method and system for synchronizing location finding measurements in a wireless local area network

  • US 20040072582A1
  • Filed: 10/02/2003
  • Published: 04/15/2004
  • Est. Priority Date: 08/20/2002
  • Status: Active Grant
First Claim
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1. A method for synchronizing location finding measurements in a wireless network, comprising:

  • receiving transmissions from at least one transmitter at multiple receivers, wherein said multiple receivers are located at predetermined locations with respect to said at least one transmitter;

    determining actual times-of-arrival of said received transmissions in response to said receiving;

    first computing differences between said actual times-of-arrival for said multiple receivers to determine actual time-differences-of-arrival for pairs of said multiple receivers;

    second computing differences between said actual time-differences-of-arrival and theoretical time-differences-of-arrival determined in conformity with said predetermined locations;

    estimating error in timebases of said multiple receivers in conformity with said second computed differences; and

    correcting measurements of other time-differences-of-arrival of other transmissions in conformity with said estimated error.

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