点目标与分布目标相结合的SAR系统极化定标方法

A Polarimetric SAR Calibration Method Using Point and Distributed Targets

极化定标是SAR图像应用的重要环节和研究方向。为推动极化定标技术的发展,在分析了国内外极化SAR定标处理主要方法的基础上,以极化散射矩阵满足互易性为前提,对基于分布目标与点目标相结合的极化定标方法进行了探讨和试验验证。测试结果表明,该方法可以完成面向全场景的极化串扰校正,以及通过少量三面角反射器定标实现极化通道的幅相均衡,具有较为广泛的应用前景。

The calibration of polarimetric radar systems is an important step and research direction in SAR image application.Based on the analysis of the main methods of polarimetric SAR calibration at home and abroad,and on the premise that the polarimetric scattering matrix satisfies the reciprocity,this paper discusses and tests the SAR polarimetric calibration method using point and distribution targets in order to promote the development of polarimetric radar calibration technique.The test results show that this method can correct the polarization channel crosstalk for all scenes,the amplitude and phase imbalance between polarimetric channels by several triangular reflectors,and it has wide application prospects.