初相捷变波形优化设计与信号处理方法研究  

Research on Optimization Design and Signal Processing Methods of Initial Phase Agility Waveform

作　　者：刘泉华[1,4] 刘子豪 任丽香 范花玉[1,3] LIU Quanhua;LIU Zihao;REN Lixiang;FAN Huayu(Radar Technology Research Institute,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;Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing,Zhejiang 314033,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401135,China)

机构地区：[1]北京理工大学雷达技术研究院,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 [3]北京理工大学长三角研究院,浙江嘉兴314033 [4]北京理工大学重庆创新中心,重庆401135

出　　处：《信号处理》2024年第1期114-125,共12页Journal of Signal Processing

基　　金：国家自然科学基金(62001024);高等学校学科创新引智计划(B14010);重庆市自然科学基金(cstc2020jcyj-msxmX0260)。

摘　　要：捷变波形具备一定的距离和速度模糊抑制能力,同时兼具优良的低截获和抗干扰性能,为雷达系统提供了新的信号处理维度。初相捷变波形相对简单,工程实现难度小,为实现波形设计和信号处理闭环,本文开展了初相捷变波形优化设计与信号处理方法研究。首先,介绍了初相捷变波形的距离选通特性,进而构建了基于距离选通特性的初相捷变波形优化设计模型,并通过Majorization-Minimization算法和牛顿法进行求解。所提算法可采用平方迭代法加快收敛速度,经仿真验证,与随机产生的初相捷变波形相比,所提算法可以显著改善优化后初相捷变波形的距离选通特性。其次,基于初相捷变波形的抗折叠杂波性能,探讨了基于距离选通特性的自适应杂波抑制算法,即利用初相捷变波形空时维导向矢量的距离选通特点,实现分距离段杂波抑制,使得近距主副瓣杂波不会折叠到远距离段,经仿真与实测数据验证,所提算法在强杂波环境下具备良好的远距低速目标探测能力。最后,研究了基于距离选通和交替反演的干扰抑制算法,利用远距支援干扰滞后于目标回波的特点,并基于初相捷变波形的距离选通特性,通过距离段间交替投影实现干扰与目标回波的分距离段重构,经仿真验证,所提算法可以实现对远距支援干扰的有效抑制。The agile waveform has a certain ability to suppress range and velocity ambiguity and expand the difference between jamming and target,while also possesses excellent low interception and anti-jamming performance.Compared to waveforms with fixed parameters,the agile waveform provides a new signal processing dimension for radar systems.The initial phase agility waveform(IPAW)is relatively simple and it is also easy to engineering implementation with low hardware requirements.To achieve waveform design and signal processing closed loop,this article conducts the research on optimization design and signal processing methods of the IPAW.Firstly,the range gating characteristic of the IPAW is introduced,and an optimizing model for IPAW design based on the range gating characteristic is constructed.The solution of the model is achieved through the Majorization-Minimization algorithm and the Newton,and squared iterative method can be easily applied to the proposed method in this article.After simulation verification,compared with the randomly generated IPAW,the proposed algorithm can significantly improve the range gating characteristic of the optimized IPAW.Then,according to the ability to suppress folded clutter,an adaptive clutter suppression algorithm based on range gating characteristic is explored.By utilizing the range gating characteristic of the space-time steer vector of the IPAW,clutter suppression in each range segment is achieved.So that the main and side lobe clutter in neardistance does not fold to the long-distance range segment.Through simulation and measured data,the detection performance of the algorithm for long-distance and low-speed targets in strong clutter environment has been verified.Finally,in view of the range gating characteristic and alternating inversion,a deceptive jamming suppression algorithm is proposed.Exploiting the characteristic of long-distance support jamming lagging behind the target echo,and based on the range gating characteristic of the IPAW,jamming and target exhibit significan

关 键 词：初相捷变波形 距离选通特性 抗折叠杂波 干扰抑制 

分 类 号：TN958.2[电子电信—信号与信息处理]