摘要
机载双基雷达杂波空时分布具有严重的距离依赖性,即其分布随距离(俯仰角)的变化而变化,给杂波抑制带来困难,使传统的二维空时自适应处理(2D-STAP)性能变差。三维空时自适应处理(3D-STAP)利用俯仰维信息,将杂波谱分布由二维拓展至三维,通过在三维空间杂波谱分布的曲面上形成自适应凹口,来对杂波进行抑制。通过分析双基任意构型下的杂波在多普勒频率-水平空间频率-垂直空间频率三维空间中的分布特性,结合双基雷达体制特点,对传统3D-STAP算法进行了改进,使3D-STAP算法适用于双基情况,为双基雷达杂波抑制提供了一种新的思路。仿真表明,在典型双基构型下,与2D-STAP相比,该方法能使杂波脊附近的改善因子提高5dB左右,有效提高了杂波抑制能力,有利于低速目标的检测。
The space-time distribution of airborne bistatic radar clutter is of serious range dependence,that is,the distribution varies with the range or elevation angle,which degrades the performance of the conventional two-dimensional space-time adaptive processing(2D-STAP)and thus brings difficulties to clutter suppression.The three-dimensional space-time adaptive processing(3D-STAP)extends the distribution of the clutter spectrum from two dimensions to three dimensions by introducing the array elevation angle.Clutter is then suppressed by forming an adaptive notch on the entire 3D clutter plane.In this paper,3D-STAP in the monostatic radar is improved to the bistatic situation by analyzing the clutter distribution characteristics in the 3D space,that is,the Doppler frequency,the horizontal spatial frequency,and the vertical spatial frequency.It provides a novel idea for the bistatic radar clutter suppression.Simulation results show that the proposed method can improve the improvement factor near the clutter ridge by about 5 dB in the typical case compared with 2D-STAP,which effectively improves the performance of clutter suppression and is beneficial to the detection of low speed targets.
作者
岳琦
吕晓德
杨璟茂
杨鹏程
YUE Qi;LYU Xiaode;YANG Jingmao;YANG Pengcheng(Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;National Key Laboratory of Science and Technology on Microwave Imaging,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《雷达科学与技术》
北大核心
2018年第4期416-422,共7页
Radar Science and Technology
关键词
机载双基雷达
距离依赖
三维空时自适应处理
杂波抑制
airborne bistatic radar
range dependence
three-dimensional space-time adaptive processing(3D-STAP)
clutter suppression
