摘要
基于反射率基法的大面积均匀场替代定标是目前常见的在轨定标方法,国内均匀场数量少,反射率偏低,定标频次与精度都受到限制。灰阶靶标法已经实现了在均匀场环境下的高精度辐射定标,但如何突破大面积均匀场单一环境背景限制实现高频次定标,依然是当前的难题。在经典辐照度基法的基础上,提出了适用于灰阶靶标的改进辐照度基法,分析讨论了复杂环境下的在轨辐射定标方法,并对某光学卫星开展了实验验证。结果表明,提出的改进辐照度基法与反射率基法的最大差别小于3.5%,可实现复杂背景环境下的在轨辐射定标,为我国光学卫星高频次、高精度在轨辐射定标提供了技术途径。
Vicarious calibration in large and uniform sites by the reflectance-based method is currently a common on-orbit calibration method.The limited number and low reflectivity of uniform sites in China have restricted calibration frequency and accuracy.The gray-scale target method has achieved high-precision radiometric calibration in a uniform site,but how to break through the single environmental background of a large uniform site to achieve high-frequency calibration is still a tough problem.On the basis of the classic irradiance-based method,this paper proposes an improved irradiance-based method suitable for gray-scale targets,analyzes a method of on-orbit radiometric calibration in complex environments,and experimentally verifies the method on an optical satellite.The results show that the proposed improved irradiance-based method,with a maximum difference of less than 3.5%from the reflectance-based method,can achieve on-orbit radiometric calibration in a complex background.It provides a technical approach for high-frequency and high-precision on-orbit radiometric calibration of optical satellites in China.
作者
包诗薇
陈洪耀
张黎明
黄文薪
司孝龙
张超
陈卓
Bao Shiwei;Chen Hongyao;Zhang Liming;Huang Wenxin;Si Xiaolong;Zhang Chao;Chen Zhuo(Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei,Anhui 230031,China;University of Science and Technology of China,Hefei,Anhui 230026,China;Beijing Institute of Remote Sensing Information,Beijing 100192,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第6期224-229,共6页
Acta Optica Sinica
关键词
遥感
辐射定标
灰阶靶标
辐照度基法
remote sensing
radiometric calibration
gray-scale target
irradiance-based method
