基于时频稀疏先验的天波超视距雷达瞬态干扰抑制算法  

Transient Interference Suppression Algorithm Based on Time Frequency Sparse Prior for Skywave OTHR

作　　者：陈子睿 计一飞 刘喜旺 张永胜 董臻[1] 陈阿磊[3] 刘维建[3] CHEN Zirui;JI Yifei;LIU Xiwang;ZHANG Yongsheng;DONG Zhen;CHEN Alei;LIU Weijian(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China;PLA unit 63726,Yinchuan 750000,China;Air Force Early Warning Academy,Wuhan 430019,China)

机构地区：[1]国防科技大学电子科学学院,长沙410073 [2]63726部队,银川750000 [3]空军预警学院,武汉430019

出　　处：《雷达学报（中英文）》2024年第6期1157-1169,共13页Journal of Radars

基　　金：国家自然科学基金(62101568,62371460,62471474);湖南省自然科学基金(2024JJ4046);博士后创新人才支持计划(BX20230473);湖南省科技创新计划资助-湖湘青年英才(2024RC3122)。

摘　　要：针对瞬态干扰严重影响天波超视距雷达(OTHR)目标检测性能的问题,提出了一种基于时频稀疏先验(TFSP)的瞬态干扰抑制算法。TFSP同时利用了瞬态干扰在慢时域的稀疏先验以及海杂波和目标在多普勒频域的稀疏先验构造目标函数,通过交替方向乘子法(ADMM)进行最优化以实现瞬态干扰抑制。不同于现有算法“干扰定位—剔除—数据恢复”的处理步骤,TFSP能够直接分离瞬态干扰分量并恢复无干扰频谱。最后,通过OTHR实测数据实验验证了TFSP在对海和对空模式下均能得到良好的瞬态干扰抑制结果,相比于多数现有方法,TFSP具有更高的输出信噪比(SNR)以及更高的运算效率,其输出SNR增加了3~5 dB,运算复杂度仅为线性对数阶。The target detection performance of skywave Over-the-Horizon Radar(OTHR)often struggles with transient interference.To address this issue,we have developed a transient interference suppression algorithm that uses Time Frequency Sparsity Prior(TFSP).TFSP uses the sparse nature of transient interference in the slow-time domain along with the sparse prior of sea clutter and targets in the Doppler frequency domain to construct an objective function,that is optimized using the Alternating Direction Method of Multipliers(ADMM)to effectively suppress transient interference.Unlike traditional methods that focus on locating and eliminating interference before recovering data,TFSP can directly separate transient interference components and restore an interference-free Doppler spectrum.Experimental results from OTHR data confirm that TFSP effectively suppresses transient interference in sea and air modes.TFSP offers a higher output Signal-to-Noise Ratio(SNR)and higher computational efficiency than most existing methods.In particular,it increases the output SNR by approximately 3~5 dB while maintaining computational complexity at a linear logarithmic order.

关 键 词：天波超视距雷达 瞬态干扰抑制 稀疏先验 最优化 交替方向乘子法 

分 类 号：TN958.93[电子电信—信号与信息处理]