扫描辐射计可见通道发射前外场定标方法对比

FY-2扫描辐射计是中科院上海技术物理研究所研制的我国风云二号静止气象卫星的主要载荷之一，为确定其响应率，中国科学院安徽光机所对FY-2（05）扫描辐射计进行了辐亮度法定标和Langley法定标，并对定标所用的5种反射率的漫反射板均匀性、反射比、BRDF性能进行了检测，给出了基于辐射标准传递的辐亮度定标的基本原理和数据处理方法，以及辐亮度定标和Langley法定标结果，综合不确定度为6.0%~6.4%。同时，提出了独立于相对光谱响应函数的基于标准探测器的反射比定标法，并与辐亮度法和Langley法进行了对比分析，其定标结果具有一致性。

Comparisons and analyses of pre-launch field radiometric calibration methods for the visible channel of scanning radiometer

The Scanning radiometer is one of the main loads of FY-2, which is developed by Shanghai Institute of Technical Physics, CAS. To obtain its radiometric responses, pre-launch field radiometric calibration test is taken by AIOFM with two calibration methods, radiation calibration and Langley calibration, are applied to the visible channel of scanning radiometer . The uniformity, reflectivity and BRDF(Bidirectional reflection of distribution function) of five Standard White References which are used for calibration were tested, the principles of the calibration and the methods of data processing have been discussed; The integrated uncertainty of the results is about 6.0%-6.4%. Besides, a new approach named Detector Based Reflectance Calibration has been developed, which is independent of spectral response function. The result of this new method is consistent with that of radiation calibration and Langley calibration.