机载MIMO雷达空时二维杂波建模及特性分析  

Modelling and Characteristics Analysis of Two-Dimensional Space-Time Clutter for Airborne MIMO Radar

作　　者：张西川[1] 张永顺[1] 王永良[2] 赵鹏飞[3] 

机构地区：[1]空军工程大学导弹学院 [2]空军雷达学院 [3]95844部队

出　　处：《空军工程大学学报（自然科学版）》2010年第5期35-38,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60736009)

摘　　要：为了揭示发射信号正交分集情况下机载MIMO雷达的杂波分布规律及特征,在分析了机载MIMO雷达几何特性的基础上,建立了机载MIMO雷达杂波的空时二维阵元模型,并推导了相应的矢量模型,分析了影响MIMO雷达杂波分布的关键因素。给出了距离模糊情况下杂波协方差矩阵估算方法,分析了机载MIMO雷达的杂波分布特性。仿真结果表明:机载MIMO雷达杂波具有良好的斜对角空时二维分布特性;MIMO雷达杂波谱中杂波基线附近杂波展宽幅度小,更利于慢速目标的检测;相比相控阵雷达,MIMO雷达具有更广的探测视角和更大的系统自由度,使其易于进行杂波抑制。Modelling and characteristics analysis of two - dimensional space - time clutter for airborne MIMO radar are the key precondition for the design of airborne MIMO Space Time Adaptive Processing （STAP） algorithm. The two - dimensional space - time clutter antenna elements model and vector model are founded based on the geometric characteristics of airborne MIMO radar in this paper. The estimating method of clutter covarlance matrix is researched under the condition of range ambiguities. The simulation results show that the airborne MIMO radar clutter is good in two - dimensional space - time diagonally distributing characteristics. Compared with the radar, MIMO radar is wider in detecting angle of vision and greater in freedom of system, by which suppress clutters.

关 键 词：机载MIMO雷达 空时二维杂波 杂波协方差矩阵 

分 类 号：TN959[电子电信—信号与信息处理]