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Ground targets locating on basis of the results of two-dimensional direction finding from flight-lifting means

Keywords:

V. A. Ufaev – Dr.Sc. (Eng.), Senior Research Scientist, Air Force Academy n.a. Prof. N.E. Zhukovsky and Yu.A. Gagarin (Voronezh). E-mail: Andreyuff@mail.ru


The estimators of coordinates of the ground targets from flight-lifting equipment have been synthesized using criteria of maximum likelihood and minimum of distance to the two-dimensional bearing lines defined by measurements of the directing vector. The algorithms for minimum of distance and averaging of partial estimates provide a solution in the algebraic form. We obtain formulas for calculating potential accuracy by Cramer\'s rule. The optimum parameters of the system spatial configuration have been defined. The simulation results have been given. It has been found that during two-dimensional direction finding with using a circular or volume antenna array mounted on a single carrier, the error is reduced in 2,1-2,5 times relative to the two-station system with one-dimensional direction finding. The potential accuracy and optimal parameters of systems with two-dimensional and one-dimensional direction finding converge with increase in the number of points of direction finding. The optimal values of lifting height and moving of direction finders from the center, at which the minimum of mean square error is reached in the circular work area, are determined by the number of positions of direction finding, the type of direction finding antenna systems and the applied algorithms of coordinates calculating. The greatest benefit from using of a volume array, 29%, is achieved for a single direction finder. The effect from combining of two direction finders into the system in respect to their concentration on one carrier is expressed in reducing the error of the coordinates determining at 15–26%. The article contains 4 figures, 2 tables and references to 7 sources of the information.
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May 29, 2020

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