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Theoretical-experimental comparison of adaptive and traditional MTI-devices in impulse radars

Keywords:

B.М. Vovshin – Dr.Sc. (Eng.), Head of Department, Design Bureau of JSC «RPC «Lianozovo Electromechanical Plant»; Professor, Moscow Technical University (MIREA)
E-mail: boris@eleron.net
I.S. Vylegzhanin – Ph.D. (Phys.-Math.), Chief Engineer, Design Bureau of JSC «RPC «Lianozovo Electromechanical Plant»
E-mail: isv1980@yandex.ru
А.N. Korneev – Head of Sector, Design Bureau of JSC «RPC «Lianozovo Electromechanical Plant»
E-mail: akorneev@lemz.ru
V.V. Lavrukevich – Ph.D. (Eng.), Leading Engineer, Design Bureau of JSC «RPC «Lianozovo Electromechanical Plant»
E-mail: lvv.0xff@gmail.com
А.А. Pushkov – Ph.D. (Eng.), Senior Research Scientist, Design Bureau of JSC «RPC «Lianozovo Electromechanical Plant»
E-mail: minipooh@yandex.ru


This article is devoted to the comparative analysis of adaptive and nonadaptive MTI systems intended for compensation of clutter with different types and forms of Doppler spectra of interperiod fluctuations. Non-adaptive MTI include traditional systems based on interperiod subtraction of various multiplicities and banks of filters configured for certain Doppler target speeds. The main disadvantages of nonadaptive systems are considered and it is shown that they are associated with a priori given structure of clutter spectrum, often significantly different from the real one. Adaptive systems include MTI based on the current estimation of the elements of inverse correlation matrix, and the formation of the corresponding weight vector of processing. Therefore, in the process of operation, they are «adjusted» to the current signal-noise environment and allow to get closer to the potentially achievable characteristics of clutter compensation. However, they are more difficult to implement. For adaptive systems of interperiod processing theoretical principles of construction based on adaptive reversing and whitening filters are given and ways of reducing the number of computational operations are considered. A semi-natural experiment, which allowed to compare the efficiency of target detection under the same conditions while using non-adaptive and adaptive MTI systems was conducted.
Experimental data proved the advantages of adaptive MTI over non-adaptive MTI and confirmed the characteristics predicted by the theory.

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