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Directional pruning of transmitters to improve position determination

  • US 9,964,647 B2
  • Filed: 03/13/2014
  • Issued: 05/08/2018
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method for estimating a position of a receiver using a network of transmitters, the method comprising:

  • identifying a set of transmitters from the network of transmitters;

    using geographic information associated with each transmitter in the set of transmitters to identify three or more groups of transmitters, wherein each group of the three or more groups includes at least one transmitter from the set of transmitters;

    determining, for each group of the three or more groups, a number of transmitters included in that group;

    for each group of the three or more groups that includes a number of transmitters that is less than an integer M, identifying at least one range measurement corresponding to at least one transmitter in that group, wherein the integer M is greater than or equal to two;

    for each group of the three or more groups that includes a number of transmitters that is equal to or greater than the integer M, identifying at least M range measurements corresponding to at least M transmitters in that group; and

    determining, using at least one processor, an estimated position of the receiver using all of the identified range measurements.

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