电子学报 ›› 2018, Vol. 46 ›› Issue (2): 401-409.DOI: 10.3969/j.issn.0372-2112.2018.02.020

• 学术论文 • 上一篇    下一篇

对空时自适应处理雷达的投散射式伪杂波干扰方法信号特性分析

谌诗娃, 周青松, 张剑云, 毛云祥   

  1. 国防科技大学电子对抗学院, 安徽合肥 230037
  • 收稿日期:2016-08-29 修回日期:2017-02-27 出版日期:2018-02-25 发布日期:2018-02-25
  • 作者简介:谌诗娃,女,1990年出生于湖南益阳,现为合肥电子工程学院博士研究生,主要研究方向是阵列信号处理,STAP雷达信号处理.E-mail:chenshiwa12@163.com;周青松,男,1982年出生于安徽巢湖,现为合肥电子工程学院讲师,主要研究方向是高速数字信号处理和凸优化理论.E-mail:Zhouqingsong1207@gmail.com;张剑云,男,1963年出生于浙江龙泉,现为合肥电子工程学院教授,博士生导师,主要研究方向是雷达及目标环境模拟,雷达信号处理,高速信号处理.E-mail:zjy921@sina.com;毛云祥,男,1973年出生于浙江诸暨,现为合肥电子工程学院副教授,主要研究方向是雷达信号处理.

Signal Characteristic Analysis of Scattered-Wave Fake Clutter Jamming Method for STAP Radar

CHEN Shi-wa, ZHOU Qing-song, ZHANG Jian-yun, MAO Yun-xiang   

  1. Institude of Electroniac Countermeasure, National University of Defense Technology, Hefei, Anhui 230037, China
  • Received:2016-08-29 Revised:2017-02-27 Online:2018-02-25 Published:2018-02-25

摘要: 针对宽带噪声干扰在空时自适应处理(Space-Time Adaptive Processing,STAP)雷达功率凝聚工作模式下无法有效掩护被保护目标方位信息的问题,提出了一种投散射式伪杂波干扰方法,分析了干扰信号在雷达接收端的空时特性.该方法通过向地面特定区域投射经过调制转发的雷达信号产生类杂波干扰信号.该信号多普勒频率与方位耦合、具有空间连续性与时间连续性,空时功率频谱轨迹可控.推导了干扰信号空时矢量模型,从雷达接收机的角度分析了干扰给目标检测带来的影响;在研究干扰信号多普勒轨迹分布特性与等值多普勒曲线分布特性的基础上,提出了干扰空时协方差矩阵特征值数目估计方法.仿真结果表明,该方法产生的干扰空时功率谱呈背脊线分布,使STAP处理器出现多个凹口,有效保护了目标信息.

关键词: 空时自适应处理, 杂波, 投散射, 空间连续性, 多普勒轨迹, 特征谱

Abstract: The wide-band noise jamming method fails to conceal the azimuth information of the target in the power condensation pattern.Therefore,a scattered-wave jamming method is proposed.The fake clutter signal is generated by scattering radar signal with Doppler shifting to the certain areas from jammers.The jamming signal acquires space-time coupling and is continuous both in space domain and time domain.The trajectory of jamming space-time power spectrum is controllable.The effect of radar target detection is analyzed by deriving the mathematic model of jamming signal.Furthermore,according to the Doppler trace feature and the Doppler isoplethic curves characteristic of the jamming signal,the estimation algorithm of the clutter and jamming covariance matrix eigenvalue number is proposed.The simulation results indicate that the shape of jamming space-time power spectrum is similar to bias,which leads to the improvement factor of STAP radar appearing more than one nocth.

Key words: STAP, clutter, scatter, spatial continuity, the Doppler trace, characteristic spectrum

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