SAR false target interference suppression method and system based on dynamic aperture

Abstract

The invention provides an SAR false target interference suppression method and system based on dynamic aperture. The method comprises the steps that a data matrix and a reference signal are generated based on mixed data; the data matrix and the reference signal are subjected to imaging processing to generate an azimuth one-dimensional image, and a target point position set to be estimated is generated according to the azimuth one-dimensional image; a dynamic observation matrix is generated according to a preset dynamic aperture window and the target point position set; a constructed observation representation matrix and the dynamic observation matrix are used to carry out minimized solving to acquire the true azimuth one-dimensional image corresponding to a separated true target point vector and a false azimuth one-dimensional image corresponding to a false target point vector; and the steps are repeated to acquire a reconstructed true target two-dimensional image and false target two-dimensional image. According to the invention, without improving the complexity of the existing radar system, the interference of a false target is effectively suppressed and the high cost of system upgrade is reduced by constructing the objective function of a deception interference separation problem and through optimization solving.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a dynamic aperture-based SAR false target interference suppression method and system. Background technique [0002] The SAR spoofing jammer performs delay and phase modulation on the intercepted SAR signal according to the pre-designed false scene, which requires less power than the traditional suppression of jamming and is more harmful. SAR is the abbreviation of "Synthetic Aperture Radar" in English, which means synthetic aperture radar. The jammer produces realistic false targets in the real scene, thereby disrupting the information acquisition and decision-making of SAR. Therefore, the research on SAR deception jamming has aroused extensive attention of scholars, and correspondingly achieved more remarkable results, making SAR deception jammers more realistically and efficiently generate more false information in a variety of complex working modes. target, thereby...

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a SAR false target interference suppression method and system based on dynamic aperture, aiming to solve the problem of poor suppression of deceptive interference results in the SAR reconstruction process in the prior art. It leads to poor imaging results of real targets and poor real scene reconstruction effect, which affects the information acquisition and decision-making of radar, and brings inconvenience to the technical problems of later information acquisition.

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