基于无源点阵的高分辨光学卫星传感器在轨定标方法研究

项目名称： 基于无源点阵的高分辨光学卫星传感器在轨定标方法研究

项目编号： No.41301374

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 徐伟伟

作者单位： 中国科学院合肥物质科学研究院

项目金额： 24万元

中文摘要： 在轨定标是光学遥感信息定量化的关键技术之一，关系到高分辨卫星遥感数据的应用和未来卫星遥感器的发展。基于大面积人工靶标的定标方法在快速布设、运输转移等方面实施难度大、效率低，难以满足高分辨卫星相机常态化高精度定标的应用需求。本课题采用理论分析与试验验证相结合的方式，探讨基于无源点阵的高分辨光学卫星相机在轨辐射定标及MTF检测方法。通过成像系统模型分析及点辐射扩散研究，建立点目标信号与遥感器有效像元区响应值的定量关系；并将目标反射率的现场测量改进为实验室的精确测量，以有效提高高分辨遥感器在轨辐射定标及MTF检测的精度，进而为实现基于小型轻量化无源点阵目标的高分辨率遥感器在轨高精度、高频次、常态化的移动式定标应用提供理论依据。该研究不但能提高我国光学卫星在轨辐射定标及MTF检测精度，而且能提高我国光学遥感信息定量化水平，对推动我国遥感器在轨性能检测等技术进步方面也有重要价值。

中文关键词： 辐射定标；MTF检测；无源点阵；高分辨卫星；定量遥感

英文摘要： Calibration on-orbit is one of critical techniques for information quantification of optical remote sensing. And it is also significant to the application of high spatial resolution satellite remote sensing data and development of future satellite sensors. Considering the difficulties and low efficiency in deployment quickly and transportation, it can't meet the requirement of normalizable and high-precise calibration for high resolution satellite optical cameras based on the large area tarps. The research is intent to explore radiometric calibration and modulation transfer function estimation in-flight of high spatial resolution satellite optical cameras using point array by theory analysis and experimental verification. The quantitative relationship between point target signal and sensor's effective pixels response could be acquired through model analysis of an imaging system and radiant flux of the point. And the target reflectance measurement at site is accurately improved in laboratory. So the accuracy of radiometric calibration and MTF estimation on-orbit for high resolution sensors can be effectively enhanced.Therefore,it can achieve high-precision, high-frequency and normalizable mobile calibration applications for high spatial resolution satellite sensors based on the light weight and small cubage point

英文关键词： radiometric calibration；MTF measurement；point array；high resolution satellite；quantitative remote sensing