SWARM卫星简化动力学厘米级精密定轨  

Centimeter Precise Orbit Determination for SWARM Satellite via Reduced-dynamic Method

作　　者：张兵兵[1] 聂琳娟[1,2] 吴汤婷 冯建迪[1] 邱耀东 

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]湖北水利水电职业技术学院,湖北武汉430070

出　　处：《测绘学报》2016年第11期1278-1284,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家973项目(2013CB733301;2013CB733302);国家自然科学基金(41274032;41210006;41474018)~~

摘　　要：联合星载GPS双频观测值与简化的动力学模型,在卫星运动方程中引入适当的伪随机脉冲参数,对SWARM卫星进行精密定轨。采用星载GPS相位观测值残差、重叠轨道以及与外部轨道对比等3种方法对SWARM卫星简化动力学定轨结果进行检核。结果表明：SWARM星载GPS相位观测值残差RMS为7～10mm;径向、切向以及法向6h重叠轨道差值RMS均在1cm左右,3个方向均无明显的系统误差。通过与欧空局（ESA）发布的精密轨道进行对比分析,径向轨道差值RMS为2～5cm,切向轨道差值RMS为2～5cm,法向轨道差值RMS为2～4cm,3D轨道差值RMS为4～7cm;SWARM-B定轨精度优于SWARM-A与SWARM-C。因此,采用简化动力学法与本文提供的定轨策略进行SWARM卫星精密定轨是切实可行的,定轨结果良好且稳定,定轨精度达到厘米级。Combining dual-frequency satellite-borne GPS observations with reduced dynamic models, and introducing proper pseudo-stochastic pulse parameters into the satellite＇s motion equation, SWARM satellite precise orbit determination is implemented. The orbit accuracy is assessed using three methods, which include analysis satellite-borne GPS phase observation residuals, orbit overlaps and external orbit comparisons. The results indicate that the SWARM satellite-borne GPS phase observation residual RMS is in the range of 7 to 10 mm, radial, along-track and cross-track orbit overlap difference RMS of 6 hours are about 1 cm, three directions have no significant systematic errors, comparisons with orbits computed by European Space Agency （ESA）, Radial orbit difference RMS is in the range of 2 to 5 cm, along-track orbit difference RMS is in the range of 2 to 5 cm, cross-track orbit difference RMS is in the range of 2 to 4 cm, 3D orbit difference RMS is in the range of 4 to 7 cm, SWARM-B orbit accuracy is better than SWARM-A and SWARM-C. This evaluations indicate that SWARM satellite precise orbit determination is practicable by using reduced-dynamic method and orbit determining strategy in the article, the orbit solution is wel and stable, the orbit accuracy reaches centimeter level.

关 键 词：SWARM卫星 伪随机脉冲 简化动力学方法 定轨策略 厘米级 

分 类 号：P228[天文地球—大地测量学与测量工程]