移频导前假目标的特性分析及其鉴别方法  

Signature Analysis and Discrimination Method of Preceded Frequency-shift False Target

作　　者：冯德军[1] 王俊杰[1] 王俊卿[2] 

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,长沙410073 [2]北京电子工程总体研究所,北京100076

出　　处：《雷达学报（中英文）》2017年第4期325-331,共7页Journal of Radars

基　　金：国家自然科学基金(61372170)~~

摘　　要：由于距离-多普勒耦合效应的存在,线性调频信号易受到转发移频干扰,利用该原理产生的导前假目标具有诸多与真实目标相似的特性,传统的前沿跟踪等手段难以剔除,对雷达威胁很大。该文在剖析移频导前假目标产生的基本原理基础上,分析了假目标的特性,指出了导致真假目标难以分辨的内在原理及现有方法的不足。同时针对干扰信号难以鉴别的难点,利用干扰信号不可避免的转发延迟,分析经过匹配滤波处理后估计获得的到达时间与其实际到达时间之间的差异,进而提出了一种对移频转发形成的导前假目标鉴别方法并分析了这种方法的性能。最后通过相应的仿真实验验证了该方法的有效性。Due to the effect of range-Doppler coupling between the time delay and shifted frequency of an LFM waveform, LFM radar is particularly susceptible to shift frequency jamming. A new deceptive jamming method,the Preceded Frequency-shift False Target（PFFT）, has a similar signature to real radar targets, which indicates that conventional ECCM, such as leading-edge tracking, could be invalid when countering it. In this paper, the basic principle of PFFT is introduced and its signatures analyzed. Then, a new method for discrimination between a preceded false target generated by Digital Radio Frequency Memory（DRFM） and a radar target is proposed. By comparing the echo arrival time at the radar receiver front end with that estimated after a matched filter, the new method can extract the frequency modulation jamming signature and make a correct judgment. Simulation results are presented to verify the validity of the proposed method.

关 键 词：有源干扰 移频导前假目标 转发延迟 干扰鉴别 

分 类 号：TN971[电子电信—信号与信息处理]