资源一号02D卫星几何定位精度保障链设计及在轨验证

Geo-location Accuracy Insurance Link Design and On-orbit Verification of ZY-1-02D Satellite

卫星的平台的稳定性和载荷的内部精度作为卫星的重要指标,如果在研制期间不进行严格控制,将会对卫星的几何成像质量带来严重影响。针对资源一号02D卫星可见近红外相机50m(Circle Error 90%,CE90)和高光谱相机100m(CE90)的高几何定位精度要求,文章引入了一种相机成像几何精度的分析模型,提出了一种卫星几何定位精度的指标分解和分析方法。该方法能够全面识别定位精度的误差影响因素和各项因素在定位精度影响中的大小,同时给出客观定量化的定位精度控制目标和手段,便于设计师在不同的研制阶段提出卫星几何定位精度的控制方案。卫星发射后,卫星在轨多景图像定位精度的评价结果表明:此方法误差分解的准确度和置信度较高,具有一定的实用价值,可以为其他光学遥感航天器几何精度的保证设计提供参考。

The platform stability and internal precision of payload are important specifications,which can severely affect imaging geometric quality without control during the satellite development phase.For the high geo-location requirement,that is,better than 50m(Circle Error 90%,CE90)for visual and near infrared camera and 100m(CE90)for hyperspectrum camera,this paper proposes geometric parameter separation and distribution method by citing a geometric ima￣ge quality analysis model.This method can comprehensively identify the effected factors and their weights on geo-location accuracy,and also provides the quantized control objectives as well as the control approaches for these objectives,which is convenient for satellite designers to decide the control strategy of geo-location during the satellite development phase.The on-orbit verification result shows that the proposed method has high precision and degree of confidence,and can be practically used for geo-location analysis,providing as a reference for geo-location design of other optical remote sensing satellites.