论文部分内容阅读
辐射定标是光学遥感信息定量化的关键技术之一。随着高分辨光学遥感器定量化应用的发展,在轨绝对辐射定标精度的要求也越来越高。提出了一种基于多灰阶靶标的在轨定标方法,采用实际测量的漫射辐照度与总辐照度比来代替辐射传输计算的气溶胶散射,同时布设高反射率靶标以提高辐射定标精度。初步试验结果表明,基于多灰阶靶标的高分辨率光学卫星传感器在轨绝对辐射定标方法,对假定的理论模型依赖较少,能够实现全动态范围的高精度定标,不确定度优于4%,而且满足复杂环境条件的应用要求。
Radiation calibration is one of the key technologies for quantifying optical remote sensing information. With the development of quantitative applications of high resolution optical remote sensors, the accuracy of on-orbit absolute radiation calibration is also getting higher and higher. An on-orbit calibration method based on multi-grayscale targets is proposed. Instead of the aerosol scattering calculated by radiation transmission, the actually measured diffuse irradiance and the total irradiance ratio are used, and at the same time, the high reflectivity target is arranged to improve the radiation Calibration accuracy. The preliminary experimental results show that the absolute orbit calibration method of high resolution optical satellite sensors based on multi-grayscale targets has less reliance on the hypothetical theoretical model and can achieve high-precision calibration of the full dynamic range with better uncertainty 4%, and meet the application requirements of complex environmental conditions.