We propose and study a method of defense against intelligent simulating signal-like active interference on the basis of an assessment of the coherent properties of radar signals. The signalcoherence measure, which is defined as the entropy of the signal-energy distribution over the eigensubspaces of the signal correlation matrix, is proposed as a selection criterion. The main factors, which influence the coherence degree of radar signals, are analyzed. The computation cost during the implementation of the proposed method for estimating the quantitative measure of the signal coherence is estimated. The results of the full-scale experimental studies, which employ various types of aircraft (with a propeller engine and turbojets) and the special equipment, i.e., a repeater of simulating signal-like interference, are presented. The estimated degree of coherence of the signals from real airborne objects and the simulating signal-like interference, which has been obtained during the experimental studies, confirms the possibility of selecting the simulating signal-like interference by the proposed method.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 64, No. 11, pp. 917–925, November 2021. Russian DOI: https://doi.org/10.52452/00213462_2021_64_11_917
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Fitasov, E.S., Legovtsova, E.V., Kudryashova, O.E. et al. Selection of Simulating Signal-Like Interference in Radar Systems with Internal Coherence. Radiophys Quantum El 64, 825–832 (2022). https://doi.org/10.1007/s11141-022-10181-4
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DOI: https://doi.org/10.1007/s11141-022-10181-4