Automatic station selection method for multi-station passive time difference positioning technology in wireless gridding

Automatic station selection method for multi-station passive time difference positioning technology in wireless gridding

  • CN 107,884,746 B
  • Filed: 11/03/2017
  • Issued: 08/28/2020
  • Est. Priority Date: 11/03/2017
  • Status: Active Grant
First Claim
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1. An automatic station selection method of a multi-station passive time difference positioning technology in radio gridding is characterized by comprising the following steps:

  • A. selecting and calculating the SNR of the radio signals received by each point by adopting a conventional method;

    B. the strength of the SNR of the radio signals received by the receiving point is sorted in descending order and numbered in sequence;

    C. selecting two strongest points of the SNR of the radio signals received by the receiving points, substituting the third strongest point of the SNR of the received radio signals, and calculating whether the three points form a non-obtuse triangle or not;

    D. if the distribution points are non-obtuse triangles, optimal three-station distribution points are obtained;

    if the station is an obtuse triangle, selecting the received radio signal with the second-lowest SNR to replace a third point, recalculating and determining whether the new three points form a non-obtuse triangle, specifically adopting the three points as a group, and performing traversal scanning to judge the shape of the triangle formed by each group of stations until the SNR of the three stations is relatively high and the formed triangle is a non-obtuse triangle;

    the non-obtuse triangle measuring method in the step C comprises the following steps;

    c1, taking SNR strongest point of received radio signal as origin of coordinates, measuring longitude and latitude of each other point from the origin of coordinates, and setting longitude and latitude of each point as Ei

    NiTransformed to rectangular coordinates xi

    yi

    The origin coordinate is x1

    0、

    y1When 0, the coordinates of each point are;

    xi

    x1+(Ei-E1

    cos(N1×

    π

    /180)×

    C/360yi

    y1+(Ni-N1) ×

    C/360, wherein i is 1,2, …

    , N, C is the circumference of the equator of the earth, and N is the number of monitoring stations;

    c2, calculating the length of three sides of the triangle formed by the stations with the numbers of 1-3,

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