It has some important potential applications in geodesy and geodynamics , including the definition , practical realization , and the interconnection of different reference frames , determining the geocentric positions of vlbi stations , estimation of the gravity field of the earth , and satellite orbit determination using the delay and delay rate observables 它在大地测量和地球动力学方面很有应用潜力,如不同参考框架的定义、实现和相互连接,利用延迟和延迟速率来进行vlbi测站地心坐标的测定,地球重力场的估计和卫星定轨等。
Unfortunately , the technique of gps - based orbit determination ( od ) ( also called kinematic od ) using gps observations especially carrier - phase measurements in our country is relatively weak . so the theory , methods and some key issues of kinematic orbit determination are discussed in this dissertation : 1 a new data pre - processing method of kinematic od is proposed in general , all cycle slip detection procedures are dependent ( implicitly or explicitly ) on analyses of least square ( ls ) pattern of the data from epoch to epoch . but unfortunately , the ls residuals cannot correctly reflect the location and sizes of gross errors because of ls sharing out the gross errors to each observation equally 考虑到星载gps低轨卫星几何法定轨在我国发展还相对缓慢，特别是基于载波相位的相对定轨的发展相对滞后的特点，本文系统研究了星载gps低轨卫星轨道确定中的理论、方法，对以下一些关键问题作了有益的探索： (一)提出了一种gps数据预处理方案现有gps数据预处理方法大都以最小二乘残差为研究对象，往往会造成粗差及周跳定位不准的问题。
The results obtained from the simulation example suggest a good effect and significance of using gps simulation data for demonstrating the feasibility and validity of an od design or an algorithm of certain problem . 4 the ill - conditioned problem existing in relative kinematic od using gps carrier - phase data is discussed and then some preliminary efficient approaches for solving this problem are given out there are several reasons that cause the ill - condition pro (四)探讨了星载gps相位相对定轨中的病态性问题，并尝试给出了较有效的解决方案地面基准站、低轨卫星和gps卫星之间的几何形状分布不佳，差分技术的应用使得模糊度之间及模糊度和三维坐标向量改正之间产生较强的相关性，往往都会导致星载gps定轨中的法矩阵的病态性。
