一种基于角度-多普勒补偿的均匀圆形天线机载雷达杂波抑制方法  

A Clutter Suppression Method Based on Angle-Doppler Compensation for Airborne Radar with Uniform Circular Array Antennas

作　　者：赵军[1] 朱兆达[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,江苏南京210016

出　　处：《航空学报》2009年第5期932-937,共6页Acta Aeronautica et Astronautica Sinica

基　　金：航空科学基金(05D52027)

摘　　要：采用均匀圆形相控阵天线的机载雷达杂波分布随距离变化而变化,各距离单元的杂波不再满足独立同分布的条件,造成统计型空时自适应处理(STAP)器性能下降。基于此,本文建立了均匀圆形天线机载雷达模型,对其杂波分布进行了分析,得出了空间角随阵元数非线性变化的特性造成其杂波距离维分布非均匀的结论。研究了一种均匀圆形天线机载雷达杂波抑制方法,该方法先通过修正的角度-多普勒补偿(MADC)预处理消除在杂波谱中心处的非均匀,再利用基于导数更新(DBU)技术进一步减小在其他方位杂波的非均匀程度。仿真结果表明了该方法的有效性。The clutter distribution of an airborne radar with uniform circular array antennas varies with its range, and samples in different range gates are not identically distributed independent vectors, so that the statistical space-time adaptive processing （STAP） methods deteriorate. In this article, based on the proposed two-dim clutter model and a detailed analysis of clutter distribution for airborne radars with uniform circular array antennas, the conclusion is drawn that the non-linear relation between space angle and number of arrays results in the nonhomogeneity at range for an airborne radar with circular array antennas. A clutter suppres- sion method is discussed in this article which involves first preproeessing with the modified angle-Doppler compensation （MADC） method to align the centers of a clutter spectrum in different range gates and subsequently performing clutter suppression in other azimuths with derivative based updating （DBU） technology. Simulation results show the validity of this method.

关 键 词：均匀圆形阵列 雷达 杂波抑制 角度-多普勒补偿 空时自适应处理 

分 类 号：TN951[电子电信—信号与信息处理]