基于空时域滤波的欺骗式干扰抑制技术
Deceptive Interference Suppression Technology Based on Spatiotemporal Filtering
邢孟道 1胡升晖 1林浩1
作者信息
- 1. 西安电子科技大学雷达信号处理重点实验室,陕西西安 710071
- 折叠
摘要
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.
Abstract
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.
关键词
欺骗式干扰/合成孔径雷达/多通道/自适应滤波器/子空间投影Key words
deception interference/synthetic aperture rader/multi-channel/adaptive filter/subspace projection引用本文复制引用
基金项目
国家自然科学基金青年基金(62301390)
出版年
2024
国家科技期刊平台
NSTL
万方数据