风云二号卫星在轨辐射定标技术进展

Progress in On-orbit Radiometric Calibration Technology for Fengyun-2 Satellite

在轨辐射定标性能是影响风云二号(FY-2)卫星定量化应用的关键因素。本文在简要回顾FY-2卫星在轨辐射定标技术发展的基础上,着重介绍了最新引进的高光谱交叉定标,以及自主研发的基于月球辐射校正的内黑体定标(CIBLE)等方法的技术特点。分析表明:以月球定标和内黑体定标为核心的CIBLE方法,从机理上解决了FY-2卫星红外波段随环境温度场频繁变化的辐射响应的高精度标定难题,实现了我国静止气象卫星在轨辐射定标技术的重大突破,并已于2012年7月、2013年3月和2013年5月分别在FY-2F、FY-2E和FY-2D星中实现业务运行。最后,对未来气象卫星在轨辐射定标技术的发展进行了初步探讨。

The performance of on-orbit radiometric calibration is the key factor influencing the quantitative application of Fengyun-2 (FY-2) satellite. After a brief review of the development of on-orbit radiometric calibration for FY-2 satellite, the latest introduced cross-calibration method with high spectral-resolution instruments and the self-developed calibration of inner blackbody corrected by lunar emission (CIBLE) are both highlighted for their technical features. The two kernels of CIBLE include lunar calibration and inner blackbody calibration. It is indicated that, the dififcult problem of how to precisely calibrate the radiometric response varying frequently with the environmental thermal ifeld for infrared bands for FY-2 satellite has been solved by CIBLE, which can be considered as one of the most important technical breakthroughs in calibration society for geostationary meteorological satellites in China. The CIBLE software has been operating on FY-2F, FY-2E and FY-2D ground systems in July 2012, March 2013 and May 2013, respectively. Finally, some preliminary thinking and discussion are conducted on the future development of on-orbit radiometric calibration technology for meteorological satellites.