基于Bernese的LAGEOS卫星精密定轨数据分析

Precise orbit determination of LAGEOS satellites based on Bernese GNSS software

高精度的激光地球动力学卫星(LAGEOS)的轨道信息是利用LAGEOS的激光测距数据进行测站坐标、地球自转参数、尺度、地心等大地测量参数精确解算的重要基础。针对现有对LAGEOS轨道确定仅使用定轨残差作为轨道评估方法,缺少对LAGEOS轨道的外部比较评估这一问题,提出利用伯尔尼(Bernese)全球卫星导航系统(GNSS)软件(Software)5.2版,对LAGEOS-1/2卫星进行精密定轨策略研究,采用定轨残差统计、外部轨道比较、地球自转参数精度评估的方法,对精密定轨策略进行全面评估。使用LAGEOS-1/2卫星2020年激光测距数据,进行精密定轨策略验证,结果表明:LAGEOS-1/2卫星定轨残差均方根值分别为0.91和0.85 cm;与国际激光测距服务中心产品相比,LAGEOS-1卫星径向、切向、法向轨道精度分别为0.46、2.13、1.54cm,LAGEOS-2卫星径向、切向、法向轨道精度分别为0.42、2.33、1.95 cm;极移解算结果与国际地球自转服务C04产品相比,X方向分量和Y方向分量的精度分别为0.24毫角秒和0.26毫角秒,日长精度为72.87μs。

Precise satellite orbit of LAser GEOdynamics Satellite(LAGEOS-1/2)is the import foundation for the precise determination of station coordinates,Earth rotation parameters,scale,geocenter and other geodetic parameters in using satellite laser ranging observations of LAGEOS-1/2 satellites.It usually use the orbiting residual to evaluate the orbit determination result,but few attempts to use the external comparative in the evaluating of the orbit.We proposed to use Bernese GNSS(Global Navigation Satellite System)Software 5.2 researching the strategy of Precise Orbit Determination(POD)of LAGEOS-1/2.Meanwhile,statistics of orbit residual,external orbit validation and validation of earth rotation parameters were utilized to assess the strategy of POD.We use the satellite laser ranging data of LAGEOS-1/2 in the whole year of 2020,the results show that:the Root Mean Square(RMS)of Satellite Laser Ranging(SLR)residual for Lageos-1/2 satellites are 0.91,0.85 cm respectively;compared with the final product of the International Laser Ranging Service(ILRS),the precision of LAGEOS-1 satellite in radial,along,normal direction is 0.46,2.13,1.54 cm respectively,while that of LAGEOS-2 satellite is 0.42,2.33,1.95 cm,the orbit of LAGEOS-1/2 estimated is of the same precision as that of ILRS Analysis Center(AC);compared with the International Earth Rotation Service(IERS)C04 Earth Rotation Parameters(ERP)products,the precision of XP,YP,Length of Day(LOD)parameters is 0.24 mas,0.26 mas,72.87μs.