基于遗传算法的OFDM雷达低旁瓣波形优化设计  

Optimal Design of OFDM Radar Low Sidelobe Waveform Based on Genetic Algorithm

作　　者：赵金珊 全英汇 刘代军[2] 张瑞 邢孟道[3] Zhao Jinshan;Quan Yinghui;Liu Daijun;Zhang Rui;Xing Mengdao(School of Electronic Engineering,Xidian University,Xi’an 710071,China;China Airborne Missile Academy,Luoyang 471009,China;National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学电子工程学院,西安710071 [2]中国空空导弹研究院,河南洛阳471009 [3]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《航空兵器》2021年第5期76-80,共5页Aero Weaponry

基　　金：国家自然科学基金项目(61772397)。

摘　　要：雷达工作环境日益复杂,距离旁瓣过高会导致微弱目标丢失、产生虚假目标。针对这一问题,提出一种基于遗传算法(genetic algorithm,GA)的正交频分复用(orthogonal frequency-division multiplexing,OFDM)雷达低旁瓣波形优化设计方法。首先,构造基于循环前缀(cyclic prefix,CP)的OFDM发射波形,将所有子载频采用m序列编码进行调制;然后,将脉冲压缩后的主副瓣比作为目标函数,将相位参量作为优化对象,把目标函数转化为无约束优化问题;最后,利用遗传算法求解该优化问题,从而实现雷达距离旁瓣抑制。理论分析和仿真结果表明,该方法能够有效抑制距离旁瓣。Radar system environment is complex,and excessively high range sidelobes will cause weak targets to be lost and false targets.To solve this problem,a novel orthogonal frequency-division multiplexing(OFDM)radar low sidelobe waveform design method based on genetic algorithm(GA)is proposed.First,the OFDM waveform based on cyclic prefix(CP)is constructed.All sub carriers are modulated with m-sequence codes.Then,the main lobe and sidelobe ratio after pulse compression is taken as the objective function,and the phase parameter is taken as the optimization object.The objective function is transformed into an unconstrained optimization problem.Last,by using genetic algorithm to solve the optimization problem,the radar range sidelobe suppression is achieved.Theoretical analysis and simulation results show that this method can effectively suppress the range sidelobes.

关 键 词：正交频分复用 循环前缀 M序列 遗传算法 低旁瓣 波形优化 雷达 

分 类 号：TJ760[兵器科学与技术—武器系统与运用工程] TN951[电子电信—信号与信息处理]