星载SAR地形辐射校正模型及其效果评价  

Terrain Radiometric Correction Model and Its Validation for Space-Borne SAR Data

作　　者：陈尔学[1,2] 李增元[1,2] 田昕[1,2] 凌飞龙[1,2] 

机构地区：[1]中国林业科学研究院资源信息研究所,北京市海淀区东小府1号100091 [2]国家林业局林业遥感与信息技术重点开放性实验室,北京市海淀区东小府1号100091

出　　处：《武汉大学学报（信息科学版）》2010年第3期322-327,共6页Geomatics and Information Science of Wuhan University

基　　金：中国林业科学研究院资源信息研究所基本科研业务费资助项目;国家973计划资助项目(2007CB714404)

摘　　要：根据合成孔径雷达(SAR)严格成像几何模型和辐射定标公式建立了地形辐射校正(TRC)模型。通过实验,从定性和定量两个方面评价了TRC模型的有效性。比较了基于投影角和基于当地入射角两种计算有效散射单元面积的方法,对根据初始定位模型计算有效散射单元面积的合理性进行了分析。Topography has significant influence on the geometric and radiometric properties of synthetic aperture radar （SAR） images. The terrain radiometric correction （TRC） of SAR images is one critical pre-processing step for quantitatively extracting bio- and geophysical parameters from SAR data. A TRC model and its implementation flow for space-borne ima- ging SAR data were introduced. The correctness and effectiveness of the model and its flow were qualitatively and quantitatively evaluated through several experimentations. By compa- ring two kinds of effective backscattering unit area computing methods, we found the project angle based method is much more effective than the local incidence angle based method. The rationality of computing effective hackscattering unit area using initial SAR geo-location model was also demonstrated. The computational results show that the computation of local incidence angle or projection angle is not sensitive to the errors of the initial geo model ap- plied. Thus it is not necessary to re-compute them using the refined geo location model.

关 键 词：合成孔径雷达 地形辐射校正 地理编码 正射校正 

分 类 号：P237.3[天文地球—摄影测量与遥感]