Experimental study of 2d interference mitigation in an active radar based on an adaptive antenna array for the short sample case

The paper analyzes an experiment on two-dimensional (in azimuth and elevation) noise suppression in an active radar in the decimeter wavelength range. The radar includes an adaptive antenna array, the canvas of which has a rectangular topology. As jammers, a continuous tone generator is used, as well as a phase-shift keyed signal generator – a Barker code of length 11. In both cases, the interference can be considered narrowband. As a useful signal (reflected from the target), a Barker code of length 11, generated by the simulator, was used. The noise suppression was carried out by the power vector method, as well as by the method of direct inversion of the noise correlation matrix. The case of a short sample when evaluating the correlation matrix is considered separately, as the most interesting for practice in conditions of limited computing resources of digital signal processors. A set of scenarios is considered both in azimuth and in elevation. In all scenarios, there was one interference and one useful signal. For each of them, the estimation of losses in relation to signal-to-noise, the interference suppression coefficient was performed, and the directivity diagrams of the adaptive antenna array were formed. The processing of the experimental data showed the high efficiency of the power vector method. In all scenarios, interference is suppressed almost to the level of thermal noise.

Authors: V. T. Ermolaev, V. Yu. Semenov, A. G. Flaksman

Direction: Physics

Keywords: adaptive antenna array, power basis, narrowband interference, two-dimensional mitigation

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