【摘要】 越来越多的LEO卫星装载了高精度的星载GPS接收机,星载GPS定轨已成为LEO卫星精密定轨的重要手段之一。星载GPS精密定轨精度依赖于GPS星历及钟差精度,采用CODE(Center for Orbit Determination in Europe)官方网站提供的GPS精密星历及钟差数据,基于瑞士伯尼尔大学开发的Bernese 5.0软件,采用非差减缩动力学定轨方法,解算了60天的CHAMP卫星和SAC-C卫星轨道,并将所得轨道与JPL和GFZ事后科学轨道比较,得出的轨道位置三维精度优于20 cm量级,速度三维精度约为0.20 mm/s。更多还原

【Abstract】 Currently an increasing number of LEO satellites are equipped with highly-accurate satellite-borne GPS receivers.The accuracies of orbit determination with such GPS depend on GPS satellite ephemerides and clock biases.This paper uses GPS satellite-ephemeris and clock-bias data from the CODE(Center for Orbit Determination in Europe)and calculates sets of 60-day orbits of the CHAMP and SAC-C satellites by using the Reduced-Dynamic Orbit Determination(with undifferenced GPS data).The calculated orbits are compared to the post-processed "science orbits" from the JPL and GFZ,which leads to the conclusion that the accuracies of the 3-dimensional orbital positions are within 20 cm and the accuracies of the 3-dimensional orbital velocities are appropriately 0.20 mm/s.更多还原