摘要
非正侧面阵、近距离地面目标检测时,由于地杂波散射体高低角随距离变化,杂波分布呈现非平稳性,在距离多普勒图上表现为曲线随距离变化。由此导致协方差矩阵难以估计,传统空时二维方法的杂波抑制作用不大。根据杂波性质,确定出杂波支撑区间曲线、强近程杂波上下界曲线,并依照此边界非均匀划分每一个多普勒通道,以保证每一段内杂波的平稳性,减小协方差矩阵估计误差。通过与其他方法的试验对比,说明非均匀分段下,空时二维杂波抑制性能有所改善。
In the ground short range target detection with the non-side-looking airborne radar, the two dimensional clutter spectrum varies with range due to the variation of elevation angle and shows high nonhomogeneity. That leads the error of estimated convariance matrix unacceptable, thus disabling usual STAP suppressing clutter. This paper presents a non-average subsection method, dividing unevenly each doppler channel based on support curve, the upper and lower bounds of the heavy short range clutter areas. By so doing, the samples included in each section follow the independent and identically distributed, and their convariance matrix can be evaluated precisely. Simulation results prove the improvement of the STAP performance.
出处
《雷达科学与技术》
2010年第1期60-64,共5页
Radar Science and Technology
关键词
非均匀分段
空时二维
近程杂波
支撑区间
non-average subsection
space time adaptive processing（STAP）
short-range clutter
support curve
