基于ACM的LFM信号抗瞄准式干扰方法

doi:10.12305/j.issn.1001-506X.2024.08.02

系统工程与电子技术 ›› 2024, Vol. 46 ›› Issue (8): 2546-2553.doi: 10.12305/j.issn.1001-506X.2024.08.02

• 电子技术 • 上一篇

基于ACM的LFM信号抗瞄准式干扰方法

刘振钰, 刘晓斌, 赵锋, 徐志明, 谢艾伦, 肖顺平

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

收稿日期:2022-11-18 出版日期:2024-07-25 发布日期:2024-08-07
通讯作者: 刘晓斌
作者简介:刘振钰 (1987—), 男, 博士研究生, 主要研究方向为雷达信号处理
刘晓斌 (1990—), 男, 副教授, 硕士研究生导师, 博士, 主要研究方向为雷达系统仿真、雷达信号处理
赵锋 (1978—), 男, 教授, 博士研究生导师, 博士, 主要研究方向为雷达电子战建模与仿真
徐志明 (1995—), 男, 讲师, 博士, 主要研究方向为空间监视、目标识别
谢艾伦 (1997—), 男, 博士研究生, 主要研究方向为雷达信号处理
肖顺平 (1964—), 男, 教授, 博士研究生导师, 博士, 主要研究方向为雷达电子战仿真与评估
基金资助:
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)

Anti aiming jamming method of LFM signal based on ACM

Zhenyu LIU, Xiaobin LIU, Feng ZHAO, Zhiming XU, Ailun XIE, Shunping XIAO

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

Received:2022-11-18 Online:2024-07-25 Published:2024-08-07
Contact: Xiaobin LIU

摘要/Abstract

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。

关键词: 幅度编码, 瞄准式干扰, 匹配滤波, 检测概率

Abstract:

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.

Key words: amplitude code, aiming jamming, match filter, detection probability

中图分类号:

TN959.1

刘振钰, 刘晓斌, 赵锋, 徐志明, 谢艾伦, 肖顺平. 基于ACM的LFM信号抗瞄准式干扰方法[J]. 系统工程与电子技术, 2024, 46(8): 2546-2553.

Zhenyu LIU, Xiaobin LIU, Feng ZHAO, Zhiming XU, Ailun XIE, Shunping XIAO. Anti aiming jamming method of LFM signal based on ACM[J]. Systems Engineering and Electronics, 2024, 46(8): 2546-2553.

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参数	数值
LFM信号脉宽/μs	10
LFM信号带宽/MHz	5
ACM频率/MHz	20
幅度编码信号占空比/%	0.5
点目标数量	3
点目标位置/m	1 500、3 500、8 500
干扰信号类型	高斯白噪声
干扰信号带宽/MHz	8

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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

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