单通道合成孔径雷达抗调频斜率失配干扰新方法  

A New Method of Anti-FM Slope Mismatch Jamming for Single Channel Synthetic Aperture Radar

作　　者：孟智超 卢景月 张帅钦 张磊 王虹现[1] MENG Zhichao;LU Jingyue;ZHANG Shuaiqin;ZHANG Lei;WANG Hongxian(National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;No.66393 Unit,the PLA,Kuerle 841001,China;School of Electronic and Communication Engineering,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]63610部队,库尔勒841001 [3]中山大学电子与通信工程学院,广州510275

出　　处：《电子与信息学报》2020年第9期2246-2252,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61771372,61771367)。

摘　　要：该文针对单通道合成孔径雷达(SAR)无法有效抑制调频斜率失配干扰的问题进行了深入的研究。根据干扰频谱与真实回波频谱的差异,该文提出了一种基于频域匹配滤波处理的合成孔径雷达调频斜率失配干扰抑制方法。该方法在准确测得干扰调频斜率的基础上,首先利用干扰信号的空间稀疏性以及低信干比(SIR)的特点,对干扰位置进行稀疏超分辨估计以获得较为精确的干扰时延相位。然后通过获得的干扰调频斜率和时延相位重建干扰信号频谱,以此为基础设计正交匹配滤波器在频域实施干扰信号的抑制,并重建无失真场景图像。最后,计算机仿真实验验证了该文所提方法的有效性。The problem that single-channel Synthetic Aperture Radar(SAR)can not effectively suppress FM slope mismatch jamming is studied in this paper.According to the difference between the jamming spectrum and the real echo spectrum,a method for suppressing the mismatch jamming of SAR FM slope based on matched filtering in the frequency domain is proposed.Based on the accurate measurement of the slope of jamming FM,the sparse super-resolution estimation of the jamming position is carried out to obtain a more accurate phase of jamming delay by utilizing the sparsity of the jamming signal and the characteristics of low Signal-to-Interference Ratio(SIR).Then,the spectrum of the interference signal is reconstructed by the obtained slope of interference frequency modulation and phase delay.Based on this,the orthogonal matched filter is designed to suppress the interference signal in the frequency domain and reconstruct the undistorted scene image.Finally,computer simulation experiments verify the effectiveness of the proposed method.

关 键 词：抗干扰 调频斜率失配干扰 稀疏 正交匹配滤波 

分 类 号：TN975[电子电信—信号与信息处理]