Study on Polarimetric Scattering Characteristics of Different Band SAR Images Based on Chinese Airborne Sar System.

At present, the Synthetic Aperture Radar (SAR) is one of the few remote sensing methods that can realize rapid allday and all-weather mapping in difficult areas of surveying and mapping, and has unique advantages incomparable with traditional optical remote sensing technology. And SAR polarimetric scattering mechanism provides important theoretical basis for surface radar target recognition. The paper adopts the P-band polarization data acquired by Chinese Academy of Surveying and Mapping SAR system (CASMSAR) as well as the C-band polarization data from Radarsat-2 and use the Freeman-Durden decomposition method to analyze and compare the difference of six typical terrain targets' scattering characteristics of different band SAR images. Results are as follows : (1) the volume scattering values of vegetation at different height are relatively high in C-band SAR image, which can be distinguished from non-vegetation, but the scattering characteristics between vegetations are confusing. (2) For P-band SAR image, there is a great difference in the volume scattering characteristics between vegetations at different height, while little difference in the odd scattering characteristics among bare soil, water area, and burnt wheat fields. (3) The volume scattering characteristics of vegetations at high height are obvious in P-band SAR image, while those at low height are obvious in C-band SAR image.