轨道改进在高精度GPS动态定位中的应用

KINEMATIC GPS POSITIONING WITH ORBIT IMPROVEMENT

本文主要研究在ＧＰＳ高精度动态定位中进行轨道改进的方法，即初始化模型法和短弧轨道改进法。前者适用于实时动态定位，后者只能用于事后动态定位数据处理。文中给出了用初始化模型法处理一个实际空中动态定位结果的例子，通过计算表明，利用本文的方法，可以提高动态定位的精度，尤其是高程分量的精度。当不久的将来，广播星历精度进一步降低时，轨道改进是高精度ＧＰＳ动态定位必不可少的方法之一。

This paper deals with kinematic GPS positioning with orbit improvement, i．e.initializa-tion procedure with orbit improvement（IPWO） method and short-arc orbit improving forkinematic positioning（SACK）method．The former is suitable to real-time kinematic posi-tioning；the latter can be only used in the post-mission data processing. An example for theairborne kinematic positioning data processing using IPWO method is given. The computa-tion shows that the kinematic positioning accuracy，especially in vertical component，can beimproved using the method proposed in this paper．When the accuracy of broadcast ephemerisis further degraded in the near future，the orbit improvement will be one of necessary meth-ods in high-precision kinematic GPS positioning.