基于SA-LFM波形的密集假目标干扰抑制算法  

Dense false target jamming suppression algorithm based on SA-LFM waveform

作　　者：王晓戈 张龙军 陈辉[1] 李槟槟 徐创 WANG Xiaoge;ZHANG Longjun;CHEN Hui;LI Binbin;XU Chuang(Air Force Early Warning Academy,Wuhan 430019,China;Military Representative Office of the Air Force EquipmentDepartment in Wuhan,Wuhan 430019,China;No.95668 Unit,the PLA,Kunming 650200,China)

机构地区：[1]空军预警学院,湖北武汉430019 [2]中国人民解放军93170部队,湖北武汉430000 [3]中国人民解放军95668部队,云南昆明650200

出　　处：《华中科技大学学报(自然科学版)》2025年第3期78-84,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(62001510,62101593)。

摘　　要：为对抗脉间相参和瞬时转发场景下多分量移频干扰形成的密集假目标,提出了一种基于脉间调频斜率捷变线性调频(SA-LFM)波形的密集假目标干扰抑制算法.首先,通过变带宽的方式,发射脉间SA-LFM波形,使假目标脉压后在快时间维形成距离走动,破坏干扰的相参性.随后,根据雷达系统性能指标设计分割阈值对回波脉压数据进行二值化处理.然后,根据目标和干扰的分布特征,将二值化数据沿慢时间维相加,设置合适门限识别目标位置并构造时域滤波器.最后,对回波脉压数据时域滤波剔除干扰.仿真实验表明:所提方法能有效抑制密集假目标干扰,并且干扰抑制后对目标有效检测的干信比临界值相较大津算法提高了7 dB.To counter the dense false targets formed by multi-component frequency-shifting jamming in the inter-pulse coherent and instantaneous forwarding scenarios,a dense false target jamming suppression algorithm based on inter-pulse slope agility linear frequency modulation(SA-LFM) waveform was proposed.Firstly,the inter-pulse SA-LFM waveform was transmitted by means of bandwidth agility to make the false targets move in the fast-time,so that the coherence of the interference was destroyed.Subsequently,the segmentation threshold was designed to binarize the echo pulse compression data according to the radar system performance index.Then,according to the distribution characteristics of the target and interference,the binarized data was added along the slow-time,and a suitable threshold was set to identify the target position and construct a time-domain filter.Finally,the echo pulse compression output was filtered in the time domain to eliminate the interference.Simulation results show that the proposed method can effectively suppress the dense false target jamming,and the critical value of the jamming-to-signal ratio for effective detection of the target after interference suppression is improved by 7 dB compared with the Otsu method.

关 键 词：密集假目标干扰 移频干扰 干扰抑制 调频斜率捷变 二值化处理 时域滤波 

分 类 号：TN974[电子电信—信号与信息处理]