Deceptive Interference Suppression Technology Based on Spatiotemporal Filtering
Deceptive interference has strong directionality in space.Their decomposition(projection)can be realized effectively in the Doppler domain by utilizing the angle-doppler relation of SAR signals.Taking advantage of this,a joint spatial-temporal adap-tive filter based on multiple Doppler constraints is proposed in this paper,which can realize effective suppression of deceptive inter-ference signals in combination with multi-channel SAR system.The space-time spectrum of the effective signal and DFI is firstly analyzed and estimated.Then the squint MSAR data are processed.The main lobe DFI is removed by using the subspace projec-tion matrix and the suppression of the side lobe DFI and the reconstruction of the signal spectrum are realized by using the multi-doppler direction linearly-constrained minimum variance(MDD-LCMV)beamformer.In this paper,the effectiveness of the pro-posed algorithm is verified by point simulation experiments.
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