对空时二维自适应处理雷达的投散射宽时限扫频式干扰技术研究  

The Study on the Scattered-Wave Long Duration Sweeping Frequency Jamming Method for STAP Radar

作　　者：谌诗娃 张剑云[1] 周青松[1] 朱家兵[2] 

机构地区：[1]电子工程学院,安徽合肥230037 [2]中国电子科技集团公司第三十八研究所,安徽合肥230037

出　　处：《电子学报》2017年第6期1349-1355,共7页Acta Electronica Sinica

基　　金：安徽省自然科学基金(No.1408085MF111);博士后基金(No.2014M552606);博士后基金特别资助(No.2015T81083)

摘　　要：针对传统干扰方法因干扰信号维度单一而难以在空时二维联合域对空时自适应处理器(Space-Time Adaptive Processing,STAP)产生有效干扰这一问题,提出了一种能覆盖整个空时二维平面的投散射宽时限扫频式干扰方法.该方法是向特定区域投射具有多普勒带宽的扫频信号,利用散射回波干扰STAP雷达.地形散射使干扰信号具有空时耦合特性,干扰信号空域连续,STAP处理器无法从空域识别抑制;宽时限扫频方式导致脉冲间多普勒频率存在差异,使雷达无法提取干扰信号多普勒频率,能占用处理器大量自由度.仿真结果表明,该方法产生的干扰功率谱能覆盖整个空时平面,使处理器自由度严重损失,导致STAP处理器性能下降,验证了该方法的有效性.The conventional jamming approaches with dimensional singularity fail to gain jamming efficiency against space-time adaptive processor （STAP） in spatial-temporal domain. Therefore, a scattered-wave long duration sweeping fre- quency jamming method is proposed. In this method the scattered wave signal, which is generated by utilizing sweeping fre- quency signal scattering with Doppler bandwidth to certain locations from jammers,is employed to counter STAP radar. With this method, the jamming signal acquires space-time coupling feature and is continuous in space domain so that it cannot be identified or suppressed by STAP radar. The proposed method makes different Doppler frequencies between pulses hinder the radar from extracting signal Doppler frequency to occupy degree of freedom in processors. The simulation shows that the power spectrum of jamming signals can cover the whole spatial-temporal domain, leading to serious losses in the degree of freedom and improvement factor of STAP. The simulation result indicates the availability of the approach.

关 键 词：空时自适应处理 投散射 扫频 空时协方差矩阵 特征谱 

分 类 号：TN97[电子电信—信号与信息处理]