基于偏航角补偿和支撑区间的机载雷达近程杂波提取方法

Airborne radar short-range clutter extraction based on yaw angle compensation and support interval

机载雷达在对非正侧面阵、近距离地面目标检测时,由于地杂波散射体俯仰角随距离变化,杂波分布呈现非均匀性,导致近程杂波强度很高,极大影响后续目标检测.为了有效地剔除近程杂波,提出基于偏航角补偿和支撑区间的近程杂波提取方法.首先根据波束主瓣形成的远程杂波估计出散射体的方位角和载机的偏航角;然后根据安装角度、偏航角度等因素确定出杂波的支撑区间;最后通过分段处理进行近程杂波区域的提取.实验结果表明,本文方法在提取近程杂波时直接从谱图上获取信息并处理,运算量小,便于工程应用.

In the short-range ground target detection with the non-side-looking airborne radar,since the pitch angle of ground clutter scatterers varies with distance,the clutter distribution shows non-homogeneity,resulting in high near-range clutter intensity,which greatly affects the subsequent target detection.In order to eliminate short-range clutter effectively,this paper proposes a method of short-range clutter extraction based on yaw angle compensation and support interval.Firstly,the scatter azimuth and the aerial carrier yaw angle are estimated from the long-range clutter formed by the main lobe.Then,the support interval of clutter is determined according to the antenna installation angle,yaw angle and other factors.Finally,the short-range clutter region is extracted by subsection processing.The experimental results show that,in time of extracting the short-range clutter,the proposed method can be used to obtain the information directly from the spectrum and process it,with small computation and convenience for engineering application.