风云三号D星的中分辨率光谱成像仪的轨道间数据融合技术

Inter-Orbital Data Fusion Technology Based on MERSI-II Instrument of FY-3D Satellite

FY-3D极轨卫星搭载的中分辨率光谱成像仪MERSI载荷具有最高分辨率达250 M的可见光遥感图像,包含了丰富的植被、山区等地表信息。风云三号卫星对遥感应用监测等具有重要作用。但是作为极轨卫星,FY-3D每间隔102min覆盖一轨数据,由于每轨数据的卫星天顶角、太阳高度角等条件存在差异,再加上风云三号是星上实时定标,每条轨道也存在定标上的差异,因此在全球拼图时不同轨道反射率数据亮度差异明显,有很明显的缝隙,再加上云的移动和变化,因此不同轨道间的云数据也明显出现断层,从而影响整个MERSI-II全球数据的应用,尤其在植被监测、城市热岛监测的应用上更是影响精度。本文以风云三号D星业务系统的全球拼图浏览系统为工作平台,创新提出了基于一定优选算法,利用卫星天顶角进行轨道间数据融合的技术,设计和开发了相应的工程化模块,来消除轨道间数据差异,业务实践证明,该技术效果明显,可显著提高后续MERSI-II载荷的遥感产品应用。

Fengyun-3D(FY-3D),the Chinese next-generation polar orbiting meteorological satellite,launched in 2017,offers several advances over the FY-3C.To support the major objective of developing data application of FY-3D,it contains rich surface information such as vegetation and mountain areas,and plays an important role in remote sensing application monitoring.However,as a polar orbit satellite,FY-3D orbits cover the corresponding area every 102 minutes.Because of the difference of zenith angle,solar altitude angle and calibration of each orbit,the brightness of different orbit data varies significantly in the global mosaic,and there are obvious gaps,as well as the movement and change of clouds,so there are obvious differences in cloud data between different orbits,which affects the application of MERSI-II global data,especially in vegetation monitoring and urban heat island monitoring.Based on the global saw browsing system of the Fengyun-3D satellite service system,this paper innovatively proposes a technology of data fusion between orbits by using the satellite zenith angle based on a certain optimization algorithm,designs and develops the corresponding engineering modules to eliminate the data difference between orbits.The practice proves that this technology has obvious effect and can significantly improve the telemetry of subsequent MERSI-II loads to improve product application.