光学学报, 2014, 34 (6): 0628003, 网络出版: 2014-05-26   

基于均匀目标的GF-1WFV与SJ-9A PMS相机交叉定标

Cross-calibration of GF-1 WFV and SJ-9A PMS Sensors Based on Homogeneous Land Surface Targets
作者单位
中国资源卫星应用中心, 北京 100094
摘要
为检测SJ-9A卫星PMS相机在轨辐射特性,获取准确的PMS相机绝对辐射定标系数,提出了基于均匀目标的GF-1 WFV与SJ-9A PMS交叉定标方法。介绍交叉定标原理和均匀目标样区的概况,并对比两个遥感器的波段设置和光谱响应差异。基于敦煌辐射校正场均匀目标历史数据和2013年8月2日GF-1WFV与SJ-9A PMS同时观测图像,实现了WFV与PMS的交叉定标。讨论了GF-1WFV与PMS相机交叉定标的影响因素及其不确定度。结果表明:利用GF-1WFV相机对SJ-9A PMS相机进行交叉定标是可行的;以敦煌场区GF-1 WFV观测数据为参考,获取的SJ-9A PMS相机交叉定标结果不确定度小于5.24%。该成果可用于SJ-9A卫星在轨性能评估和后续数据定量化应用,并为我国自主卫星遥感器间的交叉定标提供借鉴。
Abstract
To validate on-orbit radiometric performance of PMS sensor onboard SJ-9A satellite, and obtain accuracy absolute radiometric calibration coefficients of PMS, a cross-calibration method between GF-1 WFV and SJ-9A PMS sensor based on homogeneous land surface targets is established. This paper describes the theory of cross-calibration and characteristic of homogeneous field targets, and analyzes the parameters and spectral bands responsibility between PMS and WFV. Then, the cross-calibration of WFV and PMS is performed based on historical measurements data of Dunhuang sites and simultaneously observation images of two sensors on August 2, 2013. The influence factors and uncertainty of cross-calibration between WFV and PMS are discussed. The results indicate that this method for cross-calibrating PMS is doable and the spectral band matching factors is stabile and has lower sensitivity with field reflectance changing. The uncertainty of cross-calibration results of PMS is less than 5.24%. This study production can lay the foundation for on-board radiometric properties evaluation and quantitative application of SJ-9A satellite, and supply reference to cross-calibration between Chinese satellite remote sensors.

韩启金, 潘志强, 张学文, 刘李, 王爱春. 基于均匀目标的GF-1WFV与SJ-9A PMS相机交叉定标[J]. 光学学报, 2014, 34(6): 0628003. Han Qijin, Pan Zhiqiang, Zhang Xuewen, Liu Li, Wang Aichun. Cross-calibration of GF-1 WFV and SJ-9A PMS Sensors Based on Homogeneous Land Surface Targets[J]. Acta Optica Sinica, 2014, 34(6): 0628003.

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