基于ACM的LFM信号抗瞄准式干扰方法  

Anti aiming jamming method of LFM signal based on ACM

作　　者：刘振钰 刘晓斌 赵锋[1] 徐志明 谢艾伦 肖顺平[1] LIU Zhenyu;LIU Xiaobin;ZHAO Feng;XU Zhiming;XIE Ailun;XIAO Shunping(State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院电子信息系统复杂电磁环境效应国家重点实验室,湖南长沙410073

出　　处：《系统工程与电子技术》2024年第8期2546-2553,共8页Systems Engineering and Electronics

基　　金：国家自然科学基金青年基金(62001481);湖南省自然科学基金青年项目(2021JJ40686)资助课题。

摘　　要：瞄准式干扰由于干扰能量集中、干扰强度大,严重影响雷达目标探测性能。针对瞄准式干扰,提出了基于幅度编码调制(amplitude code modulation,ACM)的信号抗干扰方法。首先,通过设计ACM信号,实现雷达信号的频谱搬移,并根据ACM信号参数对匹配滤波器进行频移处理,获得谐波脉压的参考信号。其次,对谐波进行脉冲压缩处理,得到目标回波在谐波处的一维距离像。然后,通过能量补偿,弥补ACM带来的能量损失,即可得到与原始信号回波一致的目标一维距离像。最后,给出了ACM及回波抗干扰处理流程,并通过数字仿真进行验证。仿真结果表明,所提方法所获得的目标回波一维距离像与未被干扰信号获得的目标回波一维距离像基本一致。当调制频率为5倍信号带宽时,ACM信号较原始信号抗瞄准式干扰性能提升了32 dB。Aiming jamming seriously affects radar detection performance for targets due to its concentrated jamming energy and high jamming intensity.Point at aiming jamming,a signal anti jamming method is proposed based on amplitude code modulation(ACM)signal.Firstly,ACM signal is designed to shift the spectrum of radar signal and shift the frequency of match filter according to the ACM signal parameters,with the aim to obtain the reference signal of pulse compression of harmonic.Secondly,pulse compression is applied to the harmonic to obtain the one-dimensional range profile of the target echo at the harmonic.Then,energy compensation is performed to compensate the energy loss caused by ACM,and obtain the one-dimensional range profile of the target consistent with the original signal echo.Finally,the process of ACM and the operation of echo anti jamming is given and verified by digital simulation.Simulation results shows that the one-dimensional range profile of target echo obtained by the proposed method is basically consistent with that obtained by undisturbed signal.When the modulation frequency is 5 times of the signal bandwidth,the anti aiming jamming performance of ACM signal is improved by 32 dB compared with the original signal.

关 键 词：幅度编码 瞄准式干扰 匹配滤波 检测概率 

分 类 号：TN959.1[电子电信—信号与信息处理]