全极化SAR的方向角纠正在估算裸土含水量时的应用

Application of Orientation Angle Compensation to Fully Polarimetric SAR Data for Bare Soil Moisture Estimation

应用JPL/AIRSAR的L波段全极化数据,分别计算理论模型算法和圆极化算法的方向角,并对全极化SAR数据进行角度纠正,将结果与改进的积分方程模型(AIEM)预测值进行对比。结果表明:HH和VV极化下后向散射系数和同极化比的均方根误差由1.93,1.37,1.89 dB分别下降到1.62,1.24,1.62 dB和1.39,1.19,1.46 dB。证实了在使用全极化SAR数据估算裸土含水量时,进行方向角纠正数据的有效性。

JPL/AIRSAR L-band polarimetric SAR data are used to calculate the orientation angle through theoretical model and circular polarization algorithms.After orientation angle calibration,RMSE of backscattering coefficient of HH and VV polarization and co-polarization ratio versus AIEM predictions separately reduce from 1.93,1.37,1.89 dB to 1.62,1.24,1.62 dB and 1.39,1.19,1.46 dB,respectively.The authors demonstrate the validity of orientation angle compensation to fully polarimetric SAR data for bare soil moisture estimation.