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Method of locating a radiating target

  • US 3,922,533 A
  • Filed: 01/28/1975
  • Issued: 11/25/1975
  • Est. Priority Date: 03/22/1974
  • Status: Expired due to Term
First Claim
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1. The method of locating a target radiating a wave, comprising a moving platform carrying equipment for moving the platform, obtaining bearing angle, heading and location data, and additional equipment for operating upon the data including identifying identical bearing angles, the method comprising the steps of:

  • a. moving the platform along an arbitrary flight path in the vicinity of the target;

    b. recording by means of the radiated wave for different positions of the platform along the flight path relative bearing angles to the target which may contain large errors;

    c. recording for different positions of the platform the heating thereof with respect to a known point;

    d. recording for different positions of the platform the location thereof with respect to a known landmark;

    e. identifying a first and a second position of the platform having a first and a second relative bearing angle with respect to the target;

    f. calculating, based on the bearing, heading and location data of the first and second positions, a portion of a first circle passing through the first and second positions of the platform and the target, the first circle being calculated from the distance between the first and second positions and the included angle from the first and second positions to the target;

    g. identifying a third and a fourth position of the platform having a third and a fourth relative bearing angle with respect to the target, the second relative bearing angle being determinable from the first relative bearing angle and the fourth relative bearing angle being determinable from the third relative bearing angle; and

    h. calculating, based on the bearing, heading and location data of the third and fourth positions a portion of a second circle passing through the third and fourth positions of the platform and the target, the second circle being calculated by the distance between the third and fourth positions and the included angle from the third and fourth positions to the target, whereby the target location is determined by the intersection of the two circle portions.

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