包敦其河冲积扇全极化SAR数据同极化相关特征分析

Research on Copolarized Correlation Characteristic from Bodunqi Alluvial Fan Using Full-polarized SAR Data

冲积扇蕴涵气候演变信息,极化合成孔径雷达(Polarimetric Synthetic Aperture Radar-Pol-SAR)能够获取丰富的地表信息,更有效地提取冲积扇所在地区气候演变过程。不同极化正交基对应的同极化相关特征是反映地物特征的重要参数之一,其绝对值为同极化相关系数,辐角为相位差。利用全极化SIR-C L波段数据,提取并分析包敦其河冲积扇不同极化正交基对应的同极化相关特征,发现水平—垂直(h,v)线性正交基对应的同极化相关特征能够有效地反映该冲积扇的不同特征区域。此外,对同极化相关特征随包敦其河冲积扇地表粗糙度以及湿度的变化规律进行统计分析,结果表明(h,v)线性正交基对应的同极化相位差以及右旋—左旋(r,l)极化正交基对应的同极化相关系数对地表参数敏感,能够描述包敦其河冲积扇地表参数的变化。

Paleoclimate can be extricated from alluvial fan by using full-polarized Synthetic Aperture Radar （SAR）. Polarization coherence ρ is an important parameter to characterize the ground scatterers （ ｜ ρ｜ is polarization coherence coefficient,the phase of ρ is phase difference）. In this paper,the distribution of p is extricated from Bodunqi Alluvial Fan using Shuttle Imaging Radar-C （SIR-C） L band fully-polarized data. The results show that ρhhvv （ρ between Shh and Sw ） can well characterize the alluvial fan. Besides, we researched the relationship between p and ground parameters of Bodunqi Alluvial Fan such as roughness and moisture in this paper. It indicates that the phase difference between Shh and Sw and the ｜ρ｜ between Srr and Sll can be affected by ground parameters.