| 利用IGS星历预报GPS卫星轨道 |
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| 引用本文： | 何仕强,吴斌,陈俊平.利用IGS星历预报GPS卫星轨道[J].中国科学院上海天文台年刊,2011(0). |
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| 作者姓名： | 何仕强 吴斌 陈俊平 |
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| 作者单位： | 中国科学院上海天文台;中国科学院研究生院; |
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| 摘 要： | 在动力学轨道拟合以及轨道积分的基础上,提出了基于IGS精密星历的GPS卫星轨道预报方法。该方法首先利用已知的IGS精密星历作为虚拟观测值,采用动力学方法拟合出GPS卫星的初始轨道和动力学参数,然后再通过积分来预报GPS卫星的轨道。主要讨论了基于不同弧段的IGS星历时,该方法对GPS卫星轨道的拟合和预报情况。研究结果显示:对于6 d弧段以内的IGS精密星历,其拟合轨道与IGS精密星历差值的三维RMS值均优于4 cm,随着拟合弧段的增加,拟合残差变大;当利用2～6 d弧段的IGS星历来预报GPS轨道时,大部分卫星第1天、第7天和第30天的三维预报精度可优于0.1 m、3 m和100 m。其中,2d弧段的IGS星历对GPS卫星第1天和第7天的预报结果最好,5 d弧段的IGS星历对GPS卫星第30天的预报结果最好。
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| 关 键 词： | GPS IGS 轨道拟合 轨道预报 |
Orbit Predictions for GPS Satellites using IGS Ephemeris |
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| HE Shi-qiang,WU Bin,CHEN Jun-ping.Orbit Predictions for GPS Satellites using IGS Ephemeris[J].Annals of Shanghai Observatory Academia Sinica,2011(0). |
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| Authors: | HE Shi-qiang WU Bin CHEN Jun-ping |
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| Institution: | HE Shi-qiang~(1,2),WU Bin~1,CHEN Jun-ping~1 (1.Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,2.Graduate University of Chinese Academy of Science,Beijing 100049) |
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| Abstract: | A method for GPS orbits' prediction based on IGS ephemeris is presented in this paper.Firstly,GPS initial orbits are estimated using IGS precise ephemeris as pseudo-observations and then GPS orbits are integrated based on these parameters.We investigated the influence of the length of orbit arc on accuracy of orbit fitting and prediction respectively. Results show when the length of arc is less than 6 days,the average 3D RMS(Root Mean Square) of the difference between fitted orbits and IGS orbits is better ... |
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| Keywords: | GPS IGS orbit fitting orbit prediction |
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