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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。 更多还原

【Abstract】 Radiometric calibration in-flight is one of critical techniques for information quantification of optical remote sensing.With the development of quantitative application of high spatial resolution satellite optical sensors,required precision on absolute radiometric calibration is asked higher and higher.A calibration method based on gray-scale tarps is presented.The measured ratio of diffusion to global irradiance substitutes the aerosol scatter computed by radiance transfer code.Besides high re... 更多还原