漫反射板全光路全视场全口径在轨辐射定标技术

发布时间：2019-07-30 19:43

【摘要】：空间光学遥感器辐射定标包括发射前实验室辐射定标和在轨辐射定标。中国空间光学遥感器寿命由最初2~3年已延长到8~10年,需要建立在轨辐射定标系统。文章在总结美国、法国、英国同类相机在轨辐射定标方法的基础上,结合中国漫反射板研制基础及工程实现能力,以某项目需求为背景,提出了大视场可见近红外空间相机全光路全视场全口径在轨辐射定标方法。星上定标系统由漫反射板、稳定性监测比辐射计组成。漫反射板置于入光口前,定标时刻漫反射板展开后,太阳照亮漫反射板形成已知光谱辐亮度的近似朗伯面光源,直接实现空间光学遥感相机全孔径、全光路和全视场的星上辐射定标;稳定性监视比辐射计用于漫反射板星上稳定性监视及其双向反射分布函数(BRDF)修正,确保长期在轨运行过程中空间光学遥感相机的数据产品的绝对辐射定标精度。经过分析,该方法下相机绝对辐射定标精度优于5%。
[Abstract]:The radiometric calibration of the spatial optical remote sensor includes the radiation calibration of the pre-launch laboratory and the calibration of the radiation in the orbit. The life of the space optical remote sensor in China has been extended from the first 2 to 3 years to 8 to 10 years, and it is necessary to establish a system for calibrating the orbit radiation. On the basis of summarizing the calibration method of the rail radiation of the same kind of camera in the United States, France and the United Kingdom, this paper combines the development base of the diffuse reflection board of China and the implementation ability of the project, and based on the requirement of a certain project, In this paper, a large-field-of-view visible near-infrared space camera full-field full-field full-field full-field full-field wide-field radiation calibration method is proposed. The star-up calibration system consists of a diffuse reflection plate and a stability monitoring ratio radiometer. after the diffuse reflection plate is placed in front of the light inlet, the diffuse reflection plate at the time of calibration is unfolded, the sun illuminates the diffuse reflection plate to form an approximate Lambertian surface light source with the known spectral radiance, and the star-up radiation calibration of the full aperture, the full optical path and the full field of view of the spatial optical remote sensing camera is directly realized; The stability monitoring ratio radiometer is used for the stability monitoring and the two-way reflection distribution function (BRDF) correction of the diffuse reflection plate star, so as to ensure the absolute radiation calibration accuracy of the data products of the space optical remote sensing camera during the long-term in-orbit operation process. Through the analysis, the absolute radiation calibration accuracy of the camera is better than 5% under the method.
【作者单位】：北京空间机电研究所;
【基金】：科工局“十二·五”民用航天预研项目(D030101)
【分类号】：V443.5

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