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在合成孔径雷达(SAR)极化测量中,通常认为雷达视角相对于目标是不变的。然而实际上SAR通常具有较宽的方位向波束,在孔径合成过程中,所成的全分辨率SAR图像包含多个斜视角下的目标回波。极化参数的子孔径分析可以用来对成像过程表现出非平稳散射行为的媒质进行检测。本文提出了一套基于子孔径分解和对散射矩阵及参数进行统计分析的方法,来检测两类非平稳目标。仿真结果表明,这种方法具有较好的非平稳目标检测和区分性能。
In Synthetic Aperture Radar (SAR) polarization measurements, it is generally considered that the radar viewing angle is constant with respect to the target. In practice, however, SAR usually has a wide azimuth beam. During the aperture synthesis, the resulting full-resolution SAR image contains a plurality of target echoes at oblique angles of view. Polarimetric subaperture analysis can be used to detect media that exhibit non-stationary scattering during imaging. This paper presents a set of methods based on sub-aperture decomposition and statistical analysis of scattering matrix and parameters to detect two types of non-stationary targets. Simulation results show that this method has good non-stationary target detection and discrimination performance.