摘要
针对传统的移频干扰无法对抗调频斜率捷变合成孔径雷达(SAR),而盲移频干扰由于采用全脉冲处理方式生成干扰信号,其在实际工程应用中面临收发同时带来的收发隔离问题;同时基于天线收发分时工作体制的间歇采样干扰存在干扰主峰始终滞后于真实雷达目标的问题,提出了基于间歇采样的SAR盲移频干扰.首先将SAR雷达信号进行间歇采样,其次将间歇采样信号分为两路,分别对两路信号进行频谱扩展,然后通过共轭相乘操作实现频谱压缩得到基于间歇采样的盲移频干扰信号.从间歇采样干扰出发,给出了对SAR间歇采样信号进行盲移频处理的干扰原理,建立了基于间歇采样形式的SAR盲移频干扰信号的数学模型,并进一步分析了进行盲移频处理后的间歇采样信号的干扰性能.理论分析和仿真实验证明,该干扰方法不需要提前获取雷达信号参数,能够通过调整盲移频干扰中频谱扩展阶数和延迟时间来调整间歇采样干扰产生的干扰主峰位置,使间歇采样干扰主峰超前于真实雷达目标,并且该干扰方法产生的干扰主峰保留了盲移频干扰的特点,干扰主峰的距离向位置不随雷达信号调频斜率的变化而改变,能够有效对抗调频斜率捷变SAR信号.
Traditional frequency-shifted jamming is invalid for frequency modulation(FM)slope jittered synthetic aperture radar(SAR),and the blind shift-frequency jamming faces the challenge of transmitter-receiver isolation in practical engineering applications since the jamming signal is generated from a full pulse.Meanwhile,intermittent sampling jamming under the transceiver time-sharing system of the jammer’s antennas faces the problem of the main peak always lagging behind the real targets;thus,a novel method of blind shift-frequency jamming based on intermittent sampling is proposed.Firstly,sampling the signal of SAR,and dividing it into two channels,the spectra of two channel intermittent sampling signals were expanded.Then,the spectrum was compressed using a conjugate multiplication operation to obtain the jamming signal.First,the interference principle of generating jamming signal is introduced.Next,a mathematical model of blind shift-frequency jamming based on intermittent sampling is established.Finally,the performance of the proposed method is analyzed.Theoretical analysis and simulation results demonstrate that the main false target position in the range direction generated by intermittent sampling jamming can be calibrated by adjusting the spectrum expansion order and delay time through which it can produce a fronted main false target,and obtaining the parameters of SAR ahead of time is not required.Moreover,the main peak generated through the proposed method retain the charateristics of blind shift-frequency jamming,and its position does not change by the FM slope,which is valid for the FM slope jittered SAR.
作者
陈涛
陈迪霞
代亮
Chen Tao;Chen Dixia;Dai Liang(School of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2023年第2期207-213,共7页
Journal of Tianjin University：Science and Technology
基金
国防科技基础加强计划资助项目(2019-JCJQ-ZD-067-00)
中央高校基本科研业务费专项资金资助项目(30722022CF0802)。
关键词
合成孔径雷达
调频斜率捷变
盲移频
间歇采样
synthetic aperture radar
frequency modulation slope jittered
blind shift-frequency
intermittent sampling
