摘要
合成孔径雷达(SAR)辐射定标是一项关联图像像素值和地物后向散射系数的重要工作。文中在分析SAR系统的误差源和辐射定标原理的基础上,研究了无源辐射定标和有源辐射定标的精度设计原理。以机载SAR、Pi-SAR定标结果为例,结合雷达散射计的测试结果,分析了相同条件相似地物的后向散射系数的差异及相应的原因。理论分析和数据比较表明了辐射定标精度设计和比较的合理性,为定标精度和结果分析提供了理论支持和技术途径。
Radiometric calibration of synthetic aperture radar（SAR） is an important work to relate pixel values to the backscattering coefficients of ground clutters. Precision designs of passive and active calibrations are studied on the basis of analysis of error sources and principle of radiometric calibration in SAR systems. Combining calibration results of airborne SAR and Pi-SAR with many data of radar scatterometer, we analyze differences and corresponding reasons of scattering coefficients of similar ground clutters on the same condition. Theoretic analysis and comparative results show that design and analysis of calibration precision are reasonable so that they can provide a theoretic support and technical approach for precision and result analysis of radiometric calibration.
出处
《雷达科学与技术》
2009年第1期35-39,共5页
Radar Science and Technology
关键词
合成孔径雷达
后向散射系数
辐射定标
精度分析
synthetic aperture radar（SAR）
backscattering coefficient
radioraetric calibration
precision analysis
