黑体与恒星相结合的短波红外遥感器在轨辐射定标简析

Analysis of the In-Orbit Radiation Calibration of SWIR Remote Sensing System Combined with Blackbody and Star

为满足气象水文、天文观测等领域对短波红外遥感器高精度探测需求,近年来对短波红外探测定量化应用的需求越来越高。本文针对高轨面阵短波红外遥感器在轨各种因素引起的非均匀性变化情况,基于面源黑体定标结合恒星定标的在轨绝对辐射定标设计方案,结合某遥感器任务研制过程的具体实际,分析了定标精度主要影响因素及优化措施,包括星上定标方案优化、星上黑体温度控制优化、恒星提取算法优化等。通过实验室测试对在轨辐射定标方法进行了验证,并对在轨绝对辐射定标不确定度进行预估,评估结果表明定标不确定度能够满足应用要求。

Considering the demand for high-precision detection of SWIR remote sensing systems,the demand for the quantitative application of SWIR detection has increased in recent years.The change in inhomogeneity caused by shortwave infrared remote sensor was analyzed.The design scheme of non-point source blackbody calibration combined with star calibration in-orbit absolute radiation calibration;the actual development process of a remote sensing task;and the main influencing factors and optimization measures,including the optimization of the satellite calibration scheme,optimization of satellite blackbody temperature control,and star extraction algorithm,were analyzed.Based on the results of laboratory tests and estimation of the accuracy of the absolute radiation calibration,the evaluation results show that the calibration accuracy can meet the application requirements.