综合无奇点根数和坐标旋转的广播星历拟合及其性能评估

发布时间：2018-04-19 12:12

本文选题：北斗卫星导航系统 + 广播星历拟合　；参考：《大地测量与地球动力学》2017年07期

【摘要】：将无奇点根数和坐标旋转方法综合运用到地球静止轨道(geostationary earth orbit,GEO)卫星的18参数星历拟合,解决GEO卫星的小偏心率奇点和小倾角奇点问题。基于5颗北斗在轨GEO卫星1a的轨道数据,分析全年星历拟合精度和稳定性,对卫星进出地影的拟合精度进行定量分析,针对Δn参数超限问题,比较绕X轴旋转5°和55°的Δn参数变化范围。结果表明,2~4h的拟合弧长5颗GEO卫星的星历拟合精度最大为3cm,迭代次数最多为5次;拟合弧长越长,拟合精度越低,迭代次数更少;当拟合弧段包含进出地影轨道时,拟合精度降低;旋转55°比旋转5°Δn参数的变化范围减少一个数量级,Δn参数全年无超限现象。
[Abstract]:The method of root number and coordinate rotation without singularity is applied to 18 parameter ephemeris fitting of geostationary earth orbito satellite in geostationary orbit to solve the singularity of small eccentricity and the singularity of small inclination angle of GEO satellite.Based on the orbit data of 5 Beidou orbiting GEO satellites, the fitting accuracy and stability of the whole year's ephemeris are analyzed, and the fitting accuracy of the satellite in and out of the earth shadow is quantitatively analyzed, aiming at the problem of 螖 n parameter exceeding the limit.The range of 螖 n parameters of 5 掳and 55 掳rotation around X axis is compared.The results show that the fitting arc length of 5 GEO satellites has the maximum accuracy of 3 cm and the number of iterations is up to 5 times, the longer the fitting arc length, the lower the fitting accuracy and the less the number of iterations.The precision of fitting is reduced, the range of rotation 55 掳is reduced by one order of magnitude than that of rotation 5 掳螖 n, and the 螖 n parameter has no over-limit phenomenon in the whole year.
【作者单位】：中国科学院上海天文台;北京卫星导航中心;61876部队;
【基金】：国家自然科学基金(41204022,41574029,41274043) 上海市空间导航与定位技术重点实验室开放基金(14DZ2276100)~~
【分类号】：P228.4;TN967.1

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