相干频率分集阵雷达匹配滤波器设计  

Design of matched filter for coherent FDA radar

作　　者：许京伟[1] 兰岚 朱圣棋[1] 廖桂生[1] 张玉洪 XU Jingwei;LAN Lan;ZHU Shengqi;LIAO Guisheng;ZHANG Yuhong(National Lab of Radar Signal Processing,Xidian University,Xi’an 710071,China;2.School of Electronic Engineering,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071 [2]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《系统工程与电子技术》2018年第8期1720-1728,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61601339);中国博士后科学基金(2016M590925;2017T100728);香江学者计划(XJ2017027);航空科学基金(20160181001);上海航天科技创新基金(SAST2017-070);陕西省博士后科学基金资助课题

摘　　要：相干波形频率分集阵(frequency diverse array,FDA)雷达通过引入阵元间的频率差异,在观测空间中形成距离-角度-时间依赖的发射方向图。针对相干FDA雷达体制回波接收处理的问题,提出了角度-时间二维匹配滤波器,同时实现了快时间波形匹配和等效发射波束形成,不同于传统匹配滤波器。并进一步考虑某些应用情况下,通过设计匹配时间窗,提出了分段匹配的二维匹配滤波接收处理方法。将雷达脉冲时间划分为多个子脉冲接收时间窗,并采用发射方向图调制的角度-时间二维匹配滤波函数对回波信号进行相干积累。仿真实验给出了所提接收处理方法的性能验证。Frequency diverse array （FDA） radar transmitting coherent waveforms employs frequency increment between the array elements. It is capable of providing rangeangletimedependent transmit beampattern. Aiming at the receiving processing of such coherent FDA radar, a two dimensional angletime matched filter is proposed, which is capable of performing matched filtering in fasttime domain and realizing equivalent transmit beamforming. This is different from the traditional matched filtering process. Moreover, a partially matched filtering approach in angletime domain is devised by considering some particular applications. By dividing the whole pulse duration into several subpulses, the received echo is processed by the angletime matched filter modulated by the transmit beampattern. Simulation examples are provided to demonstrate the effectiveness of the proposed approaches for the coherent FDA radar.

关 键 词：相干波形 频率分集阵雷达 发射方向图 角度时间二维匹配滤波器 匹配时间窗 

分 类 号：TN95[电子电信—信号与信息处理]