VLBI在GEO卫星精密定轨中的应用  

VLBI-augmented Orbit Determination for Geostationary Satellites

作　　者：杜兰[1] 郑勇[1] 李杰[1] 

机构地区：[1]信息工程大学测绘学院,河南郑州450052

出　　处：《测绘科学技术学报》2006年第4期269-271,共3页Journal of Geomatics Science and Technology

摘　　要：影响GEO轨道确定精度的原因主要有两方面:一是高轨卫星的几何跟踪条件受到局部测轨网的限制;二是卫星相对于地面的动力学约束信息较弱。利用一个针对GEO卫星的简化动力法定轨的协方差分析模型,研究了联合测距跟踪网和甚长基线干涉测量(VLBI)对定轨精度的改善情况。指出测距系统的校正误差是常规测距跟踪网定轨精度的主要误差源;当附加一条东西向VLBI基线时,仅利用不定期的少量VLBI高精度数据就能够显著改善测距偏差对轨道的影响,从而保证了卫星的整体位置解算精度。There were two aspects that affect primarily the accuracy of angular position of geostationary satellites （GEOs）. One was the limitation of regionally distributed tracking station network for such a high altitude spacecraft as GEOs, while the other was the weakness of GEO＇ s dynamic equations in a rotational earth reference system. An approximate covariance analysis for orbit determination of geostationary satellites was given using two-way range data with and without VLBI-augmented measurements. The preliminary results indicated that range calibration bias, when larger than 1 meter, was the dominant error source for 10m-level orbit determination. By augmenting an east-west VLBI baseline within Chinese mainland, meter-level 3D components of the GEO orbit can be achieved with merely a couple of irregular VLBI data.

关 键 词：VLBI GEO卫星 动力法定轨 协方差分析 

分 类 号：P228.4[天文地球—大地测量学与测量工程]