光学学报, 2016, 36 (2): 0212005, 网络出版: 2016-01-25
比值辐射计响应特性
Response Characteristic of the Ratioing Radiometer
遥感 星上定标 比值辐射计 漫射板稳定性监视 几何因子 不确定度 remote sensing on-board calibration ratioing radiometer solar diffuser stability monitor K factor uncertainty
摘要
比值辐射计是一种监视漫反板双向反射分布函数(BRDF)在轨衰变的有效装置,太阳观测通道相对几何因子(简称几何因子)是比值辐射计在轨应用前需要精确测量的关键参数之一。对比值辐射计工作原理进行了介绍,在实验室内以卤钨灯代替室外的太阳对比值辐射计几何因子进行了重复测试,根据几何因子统计结果结合测试误差进行比值辐射计470、650、825 nm 波段几何因子测试不确定度的分析。结果表明,比值辐射计几何因子测试不确定度在470 nm 波段为0.48%,在后两个波段均优于0.16%,符合该参数的测试需求,为后期星上定标不确定度的评估以及星上定标系数的获取提供了有效的数据支撑。
Abstract
Ratioing radiometer (RR) is a key instrument which can track the on-orbit degradation in bidirectional reflectance distribution function (BRDF) of on-board solar diffuser (SD), and its response to sun angle of incidence (K factor) is an important parameter which need to be measured pre-launch. A brief overview of the principle of RR is provided in this paper, K factor of each band of RR is acquired after several round of tests, which take halogen lamp in the lab instead of sunlight outdoor as light source . Uncertainty of K factors at 470, 650, 825 nm are acquired on the base of the data and error analysis. Result shows that the uncertainty of the K factor at 470 nm is 0.48% and within 0.16% at 650 nm and 825 nm, which meet the requirement of K factor uncertainty, providing valid basis for estimation of on-orbit calibration uncertainty and correction of the calibration coefficient.
李孟凡, 徐伟伟, 邹鹏, 张黎明, 孟炳寰, 杨本永, 洪津, 乔延利. 比值辐射计响应特性[J]. 光学学报, 2016, 36(2): 0212005. Li Mengfan, Xu Weiwei, Zou Peng, Zhang Liming, Meng Binghuan, Yang Benyong, Hong Jin, Qiao Yanli. Response Characteristic of the Ratioing Radiometer[J]. Acta Optica Sinica, 2016, 36(2): 0212005.