The Polarization Orientation Shift Estimation and Compensation of PolSAR data in Forest area

摘要

Polarization orientation angle (POA) is a major parameter of electromagnetic wave. Thisrnangle will be shift due to azimuth slopes, which will affect the radiometric quality of PolSARrndata. Under the assumption of reflection symmetrical medium, the shift value of polarizationrnorientation angle (POAs) can be estimated by Circular Polarization Method (CPM). Then, thernshift angle can be used to compensate PolSAR data or extract DEM information. However, it isrnless effective when using high-frequency SAR (L-, C-band) in the forest area. The main reasonrnis that the polarization orientation angle shift of forest area not only influenced byrntopography, but also affected by the forest canopy. Among them, the influence of the former belongs tornthe interference information should be removed, but the impact of the latter belongs to the polarizationrnfeature information needs to be retained. The ALOS2 PALSAR2 L-band full polarimetric SAR datarnwas used in this study. Base on the Circular Polarization and DEM-based method, we analyzed thernvariation of shift value of polarization orientation angle and developed the polarization orientation shiftrnestimation and compensation of PolSAR data in forest.