基于稀疏迭代的非连续谱高频雷达信号处理方法  

Signal processing for discontinuous-spectrum high-frequency radar based on sparse iterative approach

作　　者：潘孟冠 刘鹏 刘升恒 陈伯孝[4] PAN Mengguan;LIU Peng;LIU Shengheng;CHEN Bairiao(Purple Mountain Laboratories,Nanjing 21111,China;Command and Control Engineering College,Army Engineering University,Nanjing 210007,China;School of Information Science and Engineering,Southeast University,Nanjing 210096,China;National Laboratory of Radar Signal Processing,Xidian University,Xi'an 710071,China)

机构地区：[1]网络通信与安全紫金山实验室,南京211111 [2]陆军工程大学指挥控制工程学院,南京210007 [3]东南大学信息科学与工程学院,南京210096 [4]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：《电波科学学报》2022年第2期262-273,共12页Chinese Journal of Radio Science

基　　金：国家自然科学基金重点项目(U1936201)

摘　　要：在拥挤频谱环境中,雷达系统在多个非连续频段发射信号并在接收端进行综合相干处理,是一种获得等效大带宽的方式.本文专门就非连续谱调频连续波(discontinuous spectrum-frequency modulated continuous wave,DS-FMCW)及其在高频雷达中的应用展开研究.首先提出采样点平移方法,建立DS-FMCW快时间维的非均匀采样序列谱估计模型;随后,进一步建立DS-FMCW距离-多普勒二维谱估计模型,提出解决距离徙动的方案;最后为解决距离高旁瓣问题,基于一种适用于单次快拍的迭代式稀疏重构算法提出DS-FMCW的距离与距离-多普勒谱估计方法,并提出相应的快速谱求解方法.仿真试验表明:所提DS-FMCW距离-多普勒处理方案能有效补偿距离徙动;当频带利用率大于20%时,所提谱估计方法能够稳定地分辨距离维间隔为雷达固有距离分辨率的1/3的两个目标,且距离估计精度优于经典最小二乘算法以及正交匹配追踪算法;所提快速算法单次迭代运算量低,适用于实时系统.In congested spectral environments,transmitting signals in several discontinuous frequency segments and coherent synthesizing at the receiver side is a method for obtaining signals with large equivalent bandwidth.This paper investigates the discontinuous spectrum-frequency modulated continuous wave(DS-FMCW)and its application in high frequency radar specially.Firstly,a sampling point displacement method is proposed,and a spectral analysis model of non-uniformly sampled sequences for the fast-time processing of DS-FMCW is established.Secondly,two-dimensional range-Doppler spectral estimation model is developed,and processing schemes for handling range migration are proposed for DS-FMCW.Finally,to solve the problem of high range sidelobes,range and range-Doppler spectral estimation methods for DS-FMCW are proposed based on an iterative sparse recovery algorithm which is applicable in the single-snapshot scenario.Fast implementations of these spectral estimation methods are also presented.Simulation experiments show that the proposed range-Doppler processing schemes of DS-FMCW are able to compensate the range migration effectively,and when the utilization rate of the frequency band is above 20%,the proposed spectral estimation method can steadily resolve two targets which are separated by one third of the intrinsic radar range resolution in the range domain,and its range estimation accuracy is better than the classical least-squares algorithm and the orthogonal matching pursuit algorithm.Finally,the proposed fast implementation algorithm is verified to have a low computational complexity in a single iteration,which makes it suitable for real-time systems.

关 键 词：高频雷达 非连续谱 调频连续波(FMCW) 距离-多普勒处理 稀疏迭代算法 

分 类 号：TN957.51[电子电信—信号与信息处理]