基于宽动态地面目标的高分二号卫星在轨定标与评价  

On-Orbit Calibration and Evaluation of GF-2 Satellite Based on Wide Dynamic Ground Target

作　　者：韩启金[1] 马灵玲[2] 刘李[1] 张学文[1] 傅俏燕[1] 潘志强[1] 王爱春[1] 

机构地区：[1]中国资源卫星应用中心,北京100094 [2]中国科学院光电研究院,北京100190

出　　处：《光学学报》2015年第7期364-371,共8页Acta Optica Sinica

基　　金：国家863计划课题(2012AA12A302);国家自然科学基金(41401424)

摘　　要：为检测高分二号(GF-2)卫星发射前后辐射性能变化,获取可靠的GF-2卫星遥感器在轨定标系数,提出了基于宽动态地面目标的场地定标方法。以敦煌戈壁场为基础,重新选建涵盖高、中、低多级反射特性的定标场,并借助反射率基法和地面观测试验,实现了GF-2卫星首次在轨辐射定标。以发射前实验室定标结果为参考,讨论GF-2卫星定标系数变化及影响因素。结果表明:1)GF-2卫星发射前后系统自身偏移量均接近于零,且相对稳定;而辐射响应特性发生了一定变化;2)采用多场地定标获取的在轨定标系数能更好表征GF-2卫星在轨辐射特性,该定标系数可作为后续定量产品反演和系统性能评估的基础。To validate the radiometric performance changing of GF-2 satellite, and obtain reliable on-orbit calibration coefficients of GF-2 sensors, an in-situ calibration methodology based on wide dynamic ground target is presented. Based on Dunhuang Gobi site, a test site including high, middle, and low reflective characteristics is re-selected and established. After that, the first on-orbit calibration for GF-2 is performed using the reflectance-based method and field measurement campaign. At last, the calibration coefficients changes and influence by comparing with prelaunch laboratory calibration results is discussed. The results indicate that： 1） the system offset of GF-2 itself is close to zero and relatively stable, while the radiometric responsivity has changed; 2） the calibration coefficients by using multi-site calibration method can better characterize on-orbit performance of GF-2 compared to the prelaunch lab calibration; the new calibration coefficients can be used for quantitative products retrieval and systems performance evaluation.

关 键 词：遥感 高分二号卫星 遥感器 辐射定标 定标场 

分 类 号：TP722.4[自动化与计算机技术—检测技术与自动化装置] TP721.1[自动化与计算机技术—控制科学与工程]