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作 者:孙颖豪 范花玉 任丽香[1,2] 毛二可 SUN Yinghao;FAN Huayu;REN Lixiang;MAO Erke(Radar Research Lab,School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Electronic and Information Technology in Satellite Navigation(Beijing Institute of Technology),Ministry of Education,Beijing 100081,China)
机构地区:[1]北京理工大学信息与电子学院雷达技术研究所,北京100081 [2]卫星导航电子信息技术教育部重点实验室(北京理工大学),北京100081
出 处:《信号处理》2021年第8期1347-1354,共8页Journal of Signal Processing
基 金:国家自然科学基金(31727901,61771050,61671065,62001024);高等学校学科创新引智计划(B14010)。
摘 要:雷达脉冲压缩处理中,通常需要使用匹配滤波器以获得最优的输出信噪比。然而,对于常用雷达波形,其匹配滤波器输出距离旁瓣较高,易产生目标遮蔽效应,而通过优化设计失配滤波器可以在牺牲一定输出信噪比的条件下有效抑制距离维旁瓣。另外,在实际应用中一般需要对系统失真进行周期性标校,进而根据经过系统失真后的雷达波形进行失配滤波器设计,所以需要高效率的失配滤波器设计算法。然而,现有的失配滤波器设计算法通常涉及矩阵求逆等复杂计算过程,其计算复杂度高且不利于硬件实现。本文提出一种基于动态交替投影的失配滤波器快速设计算法,可实现在峰值旁瓣值、积分旁瓣值、加权积分旁瓣值等优化准则下的距离维旁瓣抑制,且信噪比损失、主瓣展宽可控。本算法适用于多种脉冲压缩波形,算法过程仅需用到简单计算及快速傅里叶变换,适用于硬件的高效率设计与实现。Pulse compression is usually achieved using a matched filter to obtain the best output signal-to-noise ratio(SNR).However,for commonly used radar waveforms,the output of matched filters has high range sidelobes,which can easily result in target masking effect.It is often desirable to accept a slight penalty in the SNR to suppress range sidelobes using an optimized mismatched filter(MMF).Moreover,MMFs should be designed based on the radar waveforms with system distortion,which needs to be periodically obtained from real radar systems.Hence,MMF algorithms should be efficient.However,complex calculations,such as matrix inversion,are usually needed in existing algorithms,the large amount of computation of which is not suitable for hardware implementation.In this paper,a fast algorithm for MMF design based on dynamic alternating projection is proposed,and range sidelobes can be effectively suppressed under peak sidelobe level(PSL),integrated sidelobe level(ISL)and weighted ISL(WISL)criteria with constrained loss of SNR and mainlobe broadening.The proposed algorithm can be applied to different types of radar waveforms.Moreover,only simple calculations and fast Fourier transform(FFT)are used in the proposed algorithm,which is very suitable for hardware implementation.
关 键 词:距离维旁瓣 失配滤波器 动态交替投影 快速设计 信噪比损失
分 类 号:TN95[电子电信—信号与信息处理]
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