星上定标光谱仪(SCS)是HY-1C搭载的标准定标载荷,用于实现对同平台上其他多光谱载荷的辐射定标。基于星上定标光谱仪获得的星上定标结果,与MODIS的影像数据进行交叉定标,比较星上定标光谱仪与MODIS对相同地面区域的辐亮度数据和反射率数据,实现了对星上定标精度的评估与验证。通过对4次定标数据的处理和分析,结果表明,两者的最大相对偏差小于3%,满足同平台其他载荷的定标要求。

In this study, a satellite calibration spectrometer (SCS), as a standard calibration load on HY-1C, was used for calibrating the remaining instruments on the same satellite platform. Further, the cross-calibration method was used to evaluate and verify the accuracy of on-board calibration by comparing the radiances and reflectances obtained via SCS and moderate-resolution imaging spectroradiometer (MODIS) with respect to the same ground area. By processing the calibration data four times on different dates, the maximum relative deviation of the radiance is observed to become less than 3%, which meets the calibration requirement with respect to the remaining loads on the HY-1C platform.