长波红外空间光学遥感器高精度辐射定标技术  

Research on high-precision radiation calibration technology of long-wave infrared space optical remote sensor

作　　者：赵艳华[1,2] 王浩 李云飞[1] 李岩 张秀茜[1,2] ZHAO Yanhua;WANG Hao;LI Yunfei;LI Yan;ZHANG Xiuqian(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Beijing Key Laboratory of Advanced Optical Remote Sensing Technology,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]先进光学遥感技术北京市重点实验室,北京100094

出　　处：《遥感学报》2021年第8期1646-1654,共9页NATIONAL REMOTE SENSING BULLETIN

摘　　要：为了满足中国环保、国土、农业、气象、减灾等行业对地表温度遥感高精度监测的需求,近些年来中国长波红外空间光学遥感器空间分辨率从公里尺度提高到十米尺度分辨率,定量化应用的需求也越来越高。高精度的辐射定标是保证红外数据定量化应用的关键,本文通过全链路分析了影响辐射定标精度的因素,结合某型号任务的研制过程的具体实际,分析了主要影响因素的优化方法,包括星上定标方案优化、提高星上定标黑体控温精度和标定精度、提升长波探测器性能、提高长波探测器焦面控温精度等措施提高相机的性能和输出稳定性,并通过该型号真空辐射定标试验对辐射定标精度、系统定标响应情况进行了验证,试验结果绝对辐射定标精度为0.8 K@300 K,达到国内空间分辨率小于100 m的同类长波红外空间光学遥感器的较高水平。本文介绍的长波红外空间光学遥感器性能提升方法可为今后同类遥感器的研制及辐射定标提供参考借鉴,同时提供的定标试验验证结果也可以为同类红外卫星在轨应用提供参考。In order to meet the needs of high-precision monitoring of surface temperature remote sensing in environmental protection,land,agriculture,meteorology,disaster reduction and other industries of our country,the spatial resolution of our country’s long-wave infrared optical remote sensors has been increased from kilometer scale to ten-meter scale in recent years.The demand for quantitative applications is also increasing gradually.High-precision radiation calibration is the key to ensuring the quantitative application of infrared data.The detector of long wave infrared camera is limited by the chip material,chip preparation process,readout circuit design and production capacity and other reasons.Although the long wave infrared detector is constantly improving and developing,there are still some problems in varying degrees,such as large dark current,non-uniform response,low response and low temperature response,which directly affect the performance and radiometric calibration accuracy of long wave infrared camera.This article analyzes the factors that affect the accuracy of radiation calibration through the entire link.Combining with the specific development process of a certain model task,this article analyzes the optimization methods of the main influencing factors,including the optimization of the on-board calibration scheme,the improvement of temperature controlling accuracy and calibrating accuracy of the on-board blackbody calibration,the improvement of the performance of the long-wave detector and the improvement of the temperature controlling accuracy of the long-wave detector on the focal plane to improve the performance and output stability of the camera.The radiation calibration accuracy and the response state of system calibration has been verified through the vacuum radiation calibration test of this model.The test results show that the response slope of the radiometric calibration equation of the long wave infrared camera is effectively improved(from better than 45 of GF-501 satellite to better than

关 键 词：光学遥感 空间光学遥感器 长波红外 真空辐射定标试验 绝对辐射定标精度 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]