基于反射点源的高分辨率光学卫星传感器在轨辐射定标方法

发布时间：2018-03-18 12:27

本文选题：遥感　切入点：绝对辐射定标　出处：《光学学报》2017年03期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Absolute on-orbit radiometric calibration is one of the key techniques in the application of remote sensing information quantification. A new on-orbit calibration method based on reflection point source converts the field multipoint measurement of target reflectivity to high precision detection in laboratory. Combined with the measurement of the optical properties of the synchronous atmosphere, the radiative radiance of the satellite remote sensor is obtained by the simplified radiative transfer calculation, and the target reflection radiation, the path radiation and the background radiation are effectively separated according to the point source method in orbit point spread function detection. The assumption of aerosol scattering characteristics is eliminated, and the limitation of space-time and weather conditions for site substitution calibration is broken, which can achieve high precision of high-resolution optical satellite sensor under complex environment. High frequency moving calibration. Preliminary experimental results show that, The uncertainty of absolute radiation calibration of optical satellite sensor based on reflection point source is better than 3 and the difference between the calibration result based on large area gray scale target and that based on large area gray scale target is 3.02. The calibration process is simplified and the calibration accuracy and efficiency are improved.
【作者单位】：中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室;中国科学院合肥物质科学研究院;
【基金】：国家自然科学基金(41301374) 中国科学院科技创新基金(CXJJ-14-S89)
【分类号】：V441;TP732

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