二次多项式星载InSAR基线优化估计

Optimization Estimation for Spaceborne InSAR Baseline Using Quadratic Polynomial

提出了基于二次多项式的星载InSAR基线优化估计方法.在干涉相位方程距离向和方位向二阶偏导基础上,分析了基线误差引起的干涉相位误差可利用解缠后的干涉图,采用二次多项式来估计消除基线误差.利用TerraSAR-X、COSMO-SkyMed、RadarSat-2及ASAR等InSAR卫星带基线误差的干涉数据进行验证,结果表明所提出的方法可有效消除基线误差引起的相位误差.

Baseline is an important parameter in synthetic aperture radar interferometry （InSAR）.Tiny errors in length and inclination of the baseline can cause a great error of the interferometric phase,and eventually affect accuracy of the spatial information.This paper proposes a method to optimize estimation of baseline by using quadratic multi-polynomial aimed at unwrapped phase to eliminate the interferometric phase influence caused by the baseline error.TerraSAR-X,COSMO-SkyMed,RadarSat-2 and ASAR images are used to verify effectiveness of the proposed method.