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Method and system for target localization

  • US RE42,546 E1
  • Filed: 12/22/2005
  • Issued: 07/12/2011
  • Est. Priority Date: 03/27/2002
  • Status: Expired due to Term
First Claim
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1. A method of estimating a minimum range from an ownship to a target at a closest point of approach (CPA) between the target and the ownship, comprising:

  • a.a bearing detector obtaining at least three bearing data points of the target with respect to anthe ownship, wherein each of said bearing data points includes a bearing angle and a corresponding time of acquisition;

    b. using the three bearing data points to determine a speed contribution Vos of a first point of interest to a distance from a relative velocity vector over a time frame comprising an initial time to to a predetermined time ti;

    c.a computer system determining an angle θ

    β

    as defined as, where θ

    β

    is the bearing relative to the ownship'"'"'s heading at the point in time (tβ

    ) of the closest point of approach to a second point of interest; and

    d.the computer system calculating a minimum range Min RCPA using the formula;


    Min RCPA=VOS(tβ



    ti)cos(θ

    β



    θ

    i)θ

    i|=0;

    using the calculated minimum range for at least one of;

    targeting a weapon with respect to the target, navigating the ownship;

    e. wherein tβ

    is the time at which θ

    β

    was mreaured and θ

    i is a bearing angle to the target relative to the ownship corresponding to a first of said at least three bearing data points obtained at time ti, and Vos is the speed of the ownship during said obtaining said at least three bearing data points.

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