【作者】 程义军；

【导师】 孙海燕；

【作者基本信息】 武汉大学 ， 大地测量学与测量工程， 2005， 硕士

【摘要】 IGS提供的精密星历描述了GPS卫星在地固系中的三维位置。本文以IGS精密星历为基础,深入研究了利用精密星历计算GPS卫星轨道参数的模型与方法,并对三种不同的计算方案进行了比较研究,其目的是寻找一种合适的计算方法,得到能够正确反映一个较长时间段内(如800天)轨道参数随时间变化的规律。由于轨道参数的变化实质是各种摄动力的影响的结果,因此,研究轨道参数的变化有助于揭示摄动力变化规律。 本文研究的结果提供了一套由精密星历计算轨道参数的方法及一套各个GPS卫星在一个较长时间段内各历元时刻的轨道参数,为进一步的研究提供数据。并对计算结果进行了初步分析,得出了一些初步结论。对GPS广播星历采用的参数进行了评估,认为可以只采用13个参数即可达到15个参数的精度。 本文第一章为绪论,详述了本文的研究目的及意义。第二、三章概括了卫星运动的基础知识及轨道摄动分析解,指出了分析解存在的不足。第四章详细研究了基本模型及三种不同的计算方案,并给出了不同方案的计算结果。第五章以九参数法所得结果为基础,进行了初步分析,得出了一些初步结论,并采用几何图解分析法分析了日、月引力摄动的长周期,还对GPS广播星历采用的参数进行了评估。更多还原

【Abstract】 GPS satellite precise ephemerides provided by IGS describe there dimension position of GPS satellites in ITRF. This paper focuses on how to calculate GPS satellite orbit parameters through IGS data. Choosing a group of appropriate parameters, and the relationship between satellite position in ITRF and these parameters are founded, and these parameters can be estimated using some successive ephemerides. Three different methods are introduced detailedly. Because the variations of satellite orbit parameters reflect that of disturb perturbation forces, studying on the variations of satellite orbit parameters can help to find the regularity of perturbation forces.The result of this study provides a method calculating GPS satellite orbit parameters through IGS precise ephemerides. Orbit parameters of each GPS satellite at each epoch over a long period are calculated, which can be used for further research. Then some GPS satellites orbit parameters over a long time (for example, 800 days) are calculated and these parameters’ regularity in terms to time is analyzed, and some primary conclusions are drawn. Parameters used in GPS broadcast ephemerides are also assessed.In chapter 2, the base knowledge of satellite is introduced. In chapter 3, GPS satellite ephemerides are discussed briefly. Then in chapter 4, the main mathematic model and three methods are introduced detailedly. In chapter 5, based on nine-parameters, orbit parameters of many satellites are calculated. Then some conclusions are drawn, and parameters used in GPS broadcast ephemerides are evaluated.更多还原