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在轨绝对辐射定标是遥感信息定量化应用的关键技术之一。基于反射点源的在轨定标新方法将目标反射率的场地多点测量转换为实验室高精度检测,结合同步大气光学特性参数测量,通过简化的辐射传输计算获取星载遥感器的入瞳辐亮度;根据点源法在轨点扩展函数检测,有效分离目标反射辐射与程辐射、背景辐射,消除了对气溶胶散射特性的假设,并突破场地替代定标易受时空及天气条件的限制,能够在复杂环境条件下实现高分辨率光学卫星传感器高精度、高频次的移动定标。初步实验结果表明,基于反射点源的光学卫星传感器在轨绝对辐射定标不确定度优于3%,与基于大面积灰阶靶标的定标结果差异为3.02%,简化定标流程的同时提高了定标精度与效率。
Absolute radiation calibration in orbit is one of the key technologies for the quantitative application of remote sensing information. The new method of on-orbit calibration based on reflection point source transforms the multi-point measurement of target reflectivity into high-precision laboratory detection. Combined with the measurement of synchronous atmospheric optical parameters and the simplified radiation transmission calculation, the in- According to the point source method, it can detect the target reflection radiation, the path radiation and the background radiation effectively, and eliminate the assumptions of the aerosol scattering characteristics. Moreover, it is easy to overcome the limitation of space-time and weather conditions when replacing the site calibration , Enabling high-resolution, high-frequency motion scaling of high-resolution optical satellite sensors under complex environmental conditions. The preliminary experimental results show that the uncertainty of on-orbit absolute radiation calibration of optical satellite sensors based on reflection point sources is better than 3%, which is 3.02% different from the calibration results based on large-scale gray-scale targets, simplifying the scaling process and improving The calibration accuracy and efficiency.