一种基于普通分布目标的极化SAR幅相不平衡快速评价方法

A fast evaluation method of channel imbalance of polarimetric SAR based on common distributed targets

目前,有多种算法利用定标场和布设的定标器估算幅相不平衡,但基于定标场和定标器的方法存在时间和空间上的局限性,不能满足常态化极化质量监测的需求。基于地物的散射统计特性,提出一种基于普通分布目标的极化SAR幅相不平衡快速评价方法。给出该方法对地物散射特性的要求,并采用统计计算的策略,降低方法对地物的要求。该方法能够实现幅相不平衡的便捷常态化评估。半物理仿真实验和GF-3实测数据实验验证了该方法的有效性。

There are a variety of algorithms in which the calibrated field and calibrator are used to calculate the channel imbalance,but they do not meet the need of normalized quality monitoring because of the limitations to area and revisit frequency.In this work,based on the statistical properties of ground objects’scattering,a fast evaluation method of channel imbalance of polarimetric SAR based on common distributed targets is proposed.The requirements of the method on the scattering characteristics of ground objects are deduced,and the statistical calculation methods are adopted to reduce the requirements.This method achieves the convenient and normalized evaluation of channel imbalance.The experiments of semi-physical simulation and of GF-3 measured data verify the effectiveness of the method.