摘要
风云三号第三颗卫星(FY-3C)上装载的微波辐射成像仪(MWRI)为我们提供了地表层和大气层的重要信息.自从风云三号卫星发射以来,业务上MWRI的定位精度还存在像素级别的误差.本文中在原有的海岸线拐点法的基础上,提出使用Sigmoid曲线来进行定位估计.实验结果表明提出方法与原有方法相比能定位更加准确的海岸线点.此外,我们还将获得的海岸线点与真值点相比来计算定位误差,从而调整卫星姿态.
Microwave Radiation Imager( MWRI) onboard FengYun( FY)-3 C satellite provides important information of the earth's surface and atmosphere for us. The operational geolocation accuracy of the MWRI is at the pixel level since FY-3 C satellite is launched. In this paper,we improved on original coastline inflection method and proposed to adopt the Sigmoid curve for geolocation estimation. Experimental results demonstrate that proposed method can obtain more accurate coastline points than previous method. In addition,we also computed geolocation errors by comparing with ground truth to adjust the attitude of the satellite.
引文
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