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Apparatus and method for computing location of a moving beacon using time difference of arrival and multi-frequencies

  • US 8,026,850 B2
  • Filed: 12/08/2006
  • Issued: 09/27/2011
  • Est. Priority Date: 12/08/2005
  • Status: Expired due to Fees
First Claim
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1. A method for computing a location of a radio beacon by using Time Difference Of Arrival (TDOA) and multiple frequencies, comprising the steps of:

  • a) receiving arrival time tj transmitted from each of a plurality of base stations, j (1<

    =j<

    =n, n is the number of the base stations), wherein each of the base stations, j receives first and second signals respectively having first and second frequencies from the radio beacon, and detects and transmits phase difference Δ

    Φ

    j between the first and second signals and the arrival time tj of a predetermined one of the first and second signals;

    b) receiving the phase difference Δ

    Φ

    j from each of the base stations, j;

    c) acquiring calculation distance Rj based on the phase difference Δ

    Φ

    j with respect to each base station j, wherein the calculation distance Rj corresponds to a plurality of solution distances;

    d) calculating a predicted location of the radio beacon based on Time Difference Of Arrival (TDOA) (Δ

    t1, . . . , Δ

    tn), wherein Δ

    ti is difference between one pair of arrival times among the arrival times (t1, . . . , tn);

    e) removing phase ambiguity from the calculation distance Rj by selecting the closest solution distance to the predicted location of the radio beacon among the plurality of solution distances, with respect to each base station j; and

    f) determining the location of the radio beacon based on the calculation distances (R1, . . . , Rn) deprived of the phase ambiguity.

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