基于STFrFT的间歇采样转发干扰抑制  

Interrupted-sampling repeater jamming suppression based on STFrFT

作　　者：李晋杰 曹运合[1] 张钰林 王蒙 LI Jinie;CAO Yunhe;ZHANG Yulin;WANG Meng(National Laboratory of Radar Signal Processing,Xidian University,Xi'an 710071,China;Beijing Electro-Mechanical Engineering Institute,Beijing 100074,China)

机构地区：[1]西安电子科技大学雷达信号处理全国重点实验室,陕西西安710071 [2]北京机电工程研究所,北京100074

出　　处：《系统工程与电子技术》2024年第10期3312-3324,共13页Systems Engineering and Electronics

基　　金：国家自然科学基金(61771367)资助课题。

摘　　要：干扰机对雷达脉冲快速切片、转发形成间歇采样转发干扰,若从雷达主瓣进入,将对雷达目标检测形成严重威胁。从波形设计和时频分析的角度出发,提出一种基于短时分数阶傅里叶变换(short-time fractional Fourier transform,STFrFT)的主瓣间歇采样转发干扰抑制方法。首先设计脉内捷变频信号,提升干扰与目标信号的差异;接着采用STFrFT进行时频分析,相比传统短时傅里叶变换大大提升了时频分辨率,相比分数阶傅里叶变换类方法没有对信号参数的限制;最后结合图像学方法对干扰进行剔除,对从主瓣进入的高干信比干扰也可形成有效抑制。仿真结果表明,所提方法可在多种环境下有效对抗间歇采样转发干扰。Jammers can rapidly slice and forward radar pulse to form interrupted-sampling repeater jamming.If it enters from the main lobe of radar,it will pose a serious threat to radar target detection.Starting from waveform design and time-frequency analysis,a main lobe interrupted-sampling repeater jamming suppression method is proposed based on short-time fractional Fourier transform(STFrFT).Firstly,an intra-pulse frequency agility signal is harnessed to improve the distinguishability between jamming and target signal.Moreover,the STFrFT is applied to time-frequency analysis,which significantly improves the time-frequency analysis accuracy compared with traditional short-time Fourier transform methods and removes the restrictions on signal parameters compared with fractional Fourier transform methods.Finally,through eliminating jamming by using image processing methods,the interference of high jamming-to-signal ratio from the main lobe of radar is suppressed effectively.The simulation results indicate that the proposed method can effectively suppress interrupted-sampling repeater jamming in various environments.

关 键 词：间歇采样转发干扰 短时分数阶傅里叶变换 图像处理 频率捷变 

分 类 号：TN974[电子电信—信号与信息处理]