基于欺骗式干扰信号在空间上具有很强的方向性,通过利用SAR 信号的角度-多普勒关系,可在多普勒域实现对其有效分解(投影)的特性,提出了一种基于多多普勒约束的空-时联合自适应滤波器,结合多通道SAR(MSAR)系统可实现对欺骗式干扰信号的有效抑制。首先分析和估计有效信号和转发式欺骗干扰(DFI)的时空频谱,然后对斜视MSAR 数据进行处理,利用子空间投影矩阵去除主瓣DFI 并利用多多普勒方向线性约束最小方差(MDD-LCMV)波束成形器实现对旁瓣DFI 的抑制以及信号频谱重建。文中通过点仿真实验验证了所提算法的有效性。

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 adaptive filter based on multiple Doppler constraints is proposed in this paper, which can realize effective suppression of deceptive interference 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 projection matrix and the suppression of the side lobe DFI and the reconstruction of the signal spectrum are realized by using the multidoppler direction linearly-constrained minimum variance (MDD-LCMV) beamformer. In this paper, the effectiveness of the proposed algorithm is verified by point simulation experiments.

TN972

自然科学青年基金资助项目(62301390)