Multi-channel SAR deception jamming identification and adaptive suppression method

Abstract

The invention belongs to the technical field of radars, and discloses a novel multi-channel SAR deception jamming identification and adaptive suppression method which can accurately identify, extractand suppress deception jamming. The method comprises the steps that a multi-channel SAR radar receives an echo signal, and distance-pulse compression and distance migration compensation are carried out on the echo signal; the azimuth FFT is transformed into the distance Doppler domain, and the difference between the ground object echo and the deception jamming in the space-time relationship is used to construct the airspace orthogonal weight vector of the ground object echo in the distance Doppler data domain Doppler channel by Doppler channel, and suppress a ground object echo signal; the residual after the suppression is detected Doppler channel by Doppler channel; the acquired interference Doppler channel is used to locate the interference distance along the distance direction; and finally, the acquired interference two-dimensional position is used to collect interference samples to estimate an interference covariance matrix, and a capon algorithm is used to carry out small-scale adaptive spatial filtering on an interference region.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a multi-channel SAR deceptive interference identification and adaptive suppression method, which can be used for identification and extraction of airborne multi-channel SAR deceptive interference. Background technique [0002] Synthetic Aperture Radar (SAR) spoofing jamming is an important jamming method of Synthetic Aperture Radar (SAR). In the case of a single channel, due to the lack of necessary spatial freedom, it is impossible to use the space-time joint method to identify and extract spoofing interference, and then adaptively suppress interference. [0003] At present, a variety of space-time processing methods can be used to distinguish real echoes from spoofed signals on the space-time plane, usually including Displace phase center antenna (DPCA), Along Trace Interferometric (Along Trace Interferometric) ATI / space-time adaptive processing (Spatial-Time AdaptiveProcessing)...

AI Technical Summary

Problems solved by technology

In actual detection, since the amplitude and phase distribution in the interferometric phase map are affected by radar noise, real scene signal energy, ground radar cross-section (Radar Cross-Section) RCS fluctuations, and side lobes in imaging, a single amplitude Or the false alarm rate of phase detection fraud is too high, but because ATI is a pixel-level detection method, the amount of calculation is large and the process is complicated

On the other hand, the suppression of spoofing interference is mainly the adaptive beamforming or channel cancellation method in the whole airspace. These methods suppress the spoofing interference and also suppress the echo signal of the ground object in the same direction as the spoofing interference, resulting in a line in the imaging result. Or a few black bands, so that the loss of image information is great

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