В.К. Клочко – д.т.н., профессор, кафедра «Автоматика и информационные технологии в управлении»
SPIN-код:7666-3348, AuthorID: 498123

Problem setting. The work modifies the previously proposed model of a multi-position direction finding system consisting of two or more mutually remote and space-oriented radio receivers operating in semi-active location mode in order to detect and estimate spatial coordinates of a group of moving objects resolved by Doppler frequency. The modification is characterized by an increase in the number of transmitters remote relative to the receivers and sequentially emitting signals at different frequencies with a small time interval, as well as by the proposed algebraic approach to determining the coordinates of velocity vectors.

Purpose. The purpose of work is generalization of previously obtained solutions for Doppler multi-position radio system of receivers in case of presence of several transmitters and development of stable algorithm of rate vectors estimation in system of object direction finding with increased accuracy of estimates.

Results. In the work multi-stage signal processing is proposed. At the first stage in receivers there are coordinates of orths of vectors of directions to objects based on results of measurement of angular coordinates of azimuth and angle of place of signal reflection sources. At the second stage, the orthes of the directions are distributed to the ownership of the objects on the basis of the vector conjugation criterion. Thus objects are detected and vectors of estimates of their spatial coordinates are located. Coordinates obtained in the sequence of probing signals are clustered to reduce error of estimates. In the third step, for each detected object, there is a motion velocity vector based on stored Doppler frequency shifts. An algebraic approach to estimating coordinates of velocity vectors is proposed, which takes into account projections of these vectors both on directions of receivers and transmitters. example of Analytical calculations of reliability and errors of estimates in the considered system are given.

Practical significance. It has been shown by example that increasing the number of transmitters from one to four results in a reduction from 2 to 5 times of the errors of the velocity vector coordinate estimates. At the same time reliability of direction finding system as a whole is improved. Proposed algorithms can be used in multi-position radio systems of near sensing of small-size aircraft.

Klochko V.K.Direction finding of moving objects by multiposition Doppler system. Radiotekhnika. 2020. V. 84. № 11(21). P. 5−12. DOI: 10.18127/j00338486-202011(21)-01 (In Russian).

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