基于太阳漫射板的星上定标方法研究

发布时间：2018-07-04 17:04

本文选题：遥感 + 星上定标　；参考：《光谱学与光谱分析》2017年03期

【摘要】：基于太阳漫射板的星上定标方法是一种具有高精度、高频次、高效率等优点的独立定标方法,是目前提高我国遥感定标精度的重要手段之一。文章阐述了基于太阳漫射板的星上定标原理、方法及实现过程,建立了空间辐射标准,同时给出了星上反射率定标物理模型。分析定标物理模型发现,影响星上定标不确定度最主要的因素是太阳漫射板BRDF实时量值的确定。为此,首先介绍了星上定标时机的选择,根据所确定定标时机的太阳照明角度对太阳漫射板在实验室相应入射角度下的BRDF进行了测量。通过对太阳漫射板从制作完成到星上使用寿命终结整个过程中各阶段的BRDF量值的监测及修正,确保太阳漫射板定标时刻可为遥感器提供精确已知的辐射输入,实现遥感器全寿命期的高精度星上定标。最后,结合国内对定标模型中相关参数项测量的不确定度水平,按照测量不确定度B类评定的方法对基于太阳漫射板星上定标不确定度进行了预估,可实现星上反射率定标不确定度优于2.03%,绝对辐射定标方法不确定度优于2.04%。
[Abstract]:The on star calibration method based on the solar diffuse plate is an independent calibration method with the advantages of high accuracy, high frequency and high efficiency. It is one of the important means to improve the precision of remote sensing calibration in our country. The principle, method and implementation process of the satellite calibration based on the solar diffuse plate are described in this paper, and the standard of space radiation is set up, and the standard of space radiation is set up. The physical model of the satellite reflectivity calibration is analyzed. The analysis of the calibration physical model shows that the most important factor affecting the uncertainty of the calibration on the star is the determination of the real time value of the solar diffuse plate BRDF. BRDF is measured at the angle of shooting. By monitoring and correcting the BRDF value of the solar diffuse plate from completion to the end of the star's service life to end the whole process, the solar diffuse plate calibration time can provide accurate known radiation input for the remote sensor, and the high precision satellite calibration of the remote sensor lifetime is achieved. Finally, According to the uncertainty of the relative parameter measurement in the calibration model in China, the uncertainty of the satellite calibration based on the measurement uncertainty B is estimated. The uncertainty of the albedo calibration is better than 2.03%, and the uncertainty of the absolute radiation calibration method is better than that of 2.04%..
【作者单位】：中国科学院安徽光学精密机械研究所;中国科学院通用光学定标与表征技术重点实验室;
【基金】：中国科学院重点实验室基金项目(CXJJ-16S007)资助
【分类号】：TP73

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