外辐射源雷达模糊函数的快速算法与硬件实现  

Fast algorithm and hardware implementation of ambiguity function for passive radar

作　　者：饶云华[1,2] 聂文洋 周健康 RAO Yunhua;NIE Wenyang;ZHOU Jiankang(School of Electronic Information, Wuhan University, Wuhan 430072, China;Shenzhen Institutes, Wuhan University, Shenzhen 518108, China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]武汉大学深圳研究院,广东深圳518108

出　　处：《系统工程与电子技术》2020年第9期1953-1960,共8页Systems Engineering and Electronics

基　　金：国家自然科学基金(U1933135,61271400);国家重点研发计划(2016YFB0502403);湖北省技术创新专项重大项目(2016AAA017);深圳市科技计划(JCYJ20170818112037398)资助课题。

摘　　要：外辐射源雷达作为一种新体制雷达在探测低空小目标应用中得到了广泛的关注。针对外辐射源雷达利用模糊函数探测目标时延和多普勒频移的计算量大、难以满足系统实时性要求的问题,提出一种快速计算模糊函数方法。首先,将数据进行分段;然后,对分段后数据分别进行相关运算和抽取滤波;最后,用快速傅里叶变换(fast Fourier transform,FFT)算法对数据进行处理,显著提高了模糊函数的计算效率,并在现场可编程逻辑门阵列(field programmable gate array,FPGA)上实现了该算法。实测结果表明了该算法的可行性,研究成果为外辐射源雷达系统算法硬件化提供了参考依据。As a new radar system,passive radar has been widely used in the application of detecting low altitude small targets.In order to solve the problem that the large amount of calculation of target time delay and Doppler frequency shift detected by passive radar using ambiguity function are difficult to meet the real-time requirements of the system,a fast calculation method of ambiguity function is proposed.Firstly,the datas are segmented.Then,the segmented datas are processed by correlation operation and decimation filtering,respectively.Finally,fast Fourier transform(FFT)algorithm is used to process the data.The calculation efficiency of ambiguity function is improved significantly,and the algorithm is implemented on field programmable gate array(FPGA).The experimental results show the feasibility of the algorithm,and the research results provide a reference for the hardware implementation of the algorithm of the passive radar system.

关 键 词：外辐射源雷达 模糊函数 现场可编程逻辑门阵列 素因子算法 

分 类 号：TN958.97[电子电信—信号与信息处理]