基于小波变换的雷达脉冲间歇收发回波联合重构方法  

Joint Reconstruction Method for Radar Pulse ITR Echo Based on Wavelet Transform

作　　者：乔振宇 刘晓斌 谢艾伦 赵锋[1] 王玲[1] QIAO Zhenyu;LIU Xiaobin;XIE Ailun;ZHAO Feng;WANG Ling(State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子信息系统复杂电磁环境效应国家重点实验室,湖南长沙410073

出　　处：《雷达科学与技术》2024年第5期469-477,486,共10页Radar Science and Technology

基　　金：国家自然科学基金重大项目(No.61890542);湖南省自然科学基金青年项目(No.2021JJ40686);国家自然科学基金青年项目(No.62001481)。

摘　　要：进行内场测量时,间歇收发处理能有效解决因暗室尺寸导致的收发信号耦合,但该方法会造成目标回波被部分截断。在回波重构过程中,受暗室本身结构设计及吸波材料性能等因素的影响,回波中不可避免出现噪声干扰,使得重构性能降低。为提高回波重构的精确度,本文提出基于小波变换的雷达脉冲间歇收发回波联合重构方法,该方法结合间歇收发原理和Mallat算法,实现了低信噪比条件下LFM脉冲雷达信号的精确重构。仿真和实验结果表明,联合重构方法所得目标回波和一维距离像与完整脉冲保持一致,验证了本文方法的有效性。In anechoic chamber measurement,intermittent transmitting and receiving(ITR)can effectively solve the problem of mutual coupling caused by the size of anechoic chamber,but ITR will lead to echo loss.In the process of echo reconstruction,noise and clutter are inevitable due to the influence of anechoic chamber structure and the proper⁃ties of absorbing materials.This results in lower reconstruction performance.To improve the accuracy of echo recon⁃struction,a joint reconstruction method is proposed for radar pulse ITR echo based on wavelet transform.The accurate reconstruction of linear frequency modulation(LFM)echo under the condition of low signal⁃to⁃noise ratio(SNR)is rea⁃lized by combining the ITR principle and Mallat algorithm.Simulation and experimental results demonstrate that the target echo and one⁃dimensional range profile obtained by the joint reconstruction method are consistent with the com⁃plete pulse radar signal.Therefore,the proposed method is effective.

关 键 词：小波阈值去噪 间歇收发 联合重构 距离像 

分 类 号：TN959.1[电子电信—信号与信息处理]