星载SAR遥感影像地形辐射校正——以ALOS PALSAR为例  

Terrain Radiometric Correction of Space-borne SAR Remote Sensing Image:Taking ALOS PALSAR Data for an Example

作　　者：薛东剑[1,2] 何政伟[1,2] 贾诗超 余祥伟 陈凤娇 XUE Dongjian;HE Zhengwei;JIA Shichao;YU Xiangwei;CHEN Fengjiao(College of Earth Sciences,Chengdu University of Technology,Chengdu 610059;Key Laboratory of Geoscience Spatial Information Technology,Ministry of Land and Resources of the P.R.China,Chengdu 610059,China)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]地学空间信息技术国土资源部重点实验室,成都610059

出　　处：《遥感信息》2018年第3期13-16,共4页Remote Sensing Information

基　　金：四川省教育厅重点项目(16ZA0100);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2017Z005).

摘　　要：针对地形起伏造成的SAR图像辐射畸变等问题,在分析SAR成像机理及几何结构的基础上,通过推导,构建了基于规则化散射因子及局部入射角的地形辐射校正模型。以ALOS PALSAR为例,依据DEM与卫星轨道参数,采用R-D定位模型及Muhleman半经验模型,在模拟SAR影像的基础上,建立了真实SAR与DEM之间的映射关系,实现了对原始SAR影像的地理编码,提取了局部入射角、投影角及规则化因子等,进行了地形辐射校正,从而消除了面积效应及地形起伏造成的畸变问题。校正后的图像纹理特征更加均匀,散射系数与局部入射角的线性相关性显著降低。该研究对雷达图像的应用具有一定的借鉴意义。Based on the analysis of the SAR imaging mechanism and geometric structure,through the deduction,the terrain radiation correction model based on regular scattering factor and the local incidence angle was constructed aiming at the problems of radiation distortion of SAR images caused by topographic relief.Taking ALOS PALSAR as an example,according to DEM and satellite orbital parameters,R-D positioning model and Muhleman semiempirical modal are used.Based on the simulation of SAR images,the true mapping relationship between the real SAR and DEM was established,and original SAR images were geocoded.The local incidence angle,projection angle and regularization factor were extracted as well.The terrain radiometric correction was conducted to eliminate area effects and distortion caused by terrain undulations.From the result analysis,the texture features of corrected images are more uniform,and the linear correlation between scattering coefficient and the local incidence angle is significantly reduced.This has specific reference significance for the application of radar images.

关 键 词：PALSAR R-D模型 SAR模拟 地形辐射校正 安县 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]