中文摘要：

为了实现与确保区域导航服务能力，COMPASS设计采用GEO／tGSO／MEO混合星座，利用区域监测网完成卫星轨道测定与预报，并通过预报星历确保导航服务。在区域布站条件下，难以实现对IGSO／MEO卫星的全弧段跟踪；混合星座条件下，不同卫星的动力学特性存在一定的差异，尤其是首次采用GEO卫星，其静地特性致使轨道与钟差强相关，为动力学模型选取带来一定的困难。这些不利因素都给轨道确定带来一定的挑战。本文给出了区域监测网条件下多星定轨的测量模型与动力学模型，设计了轨道与钟差参数的解算方案，系统地分析与论证了区域布站条件下的混合星座定轨精度。试验表明，卫星三维位置精度优于2m，基于激光数据检验的GEO卫星轨道预报2h视向精度优于0．3m．IGSO卫星轨道预报6h视向精度优于0．4m。

英文摘要：

In order to realize and ensure COMPASS regional navigation system services, COMPASS system adopts a hybrid constellation composed of GEO, IGSO and MEO, completes orbit determination and prediction by a regional tracking network and ensure navigation services through forecasting ephemeris. It is difficult for the regional tracking stations to make whole - arc tracking for IGSO/MEO. Meanwhile, for the hybrid constellation condition different type of satellites have differences in dynamic characteristics. Especially GEO satellites are first adopted for navigation purpose, whose stationary characteristics leads to the orbit and clock strongly correlated, which brings certain difficulty for selecting dynamic model parameters. This paper proposes a measurement model and a dynamic model for orbit determination in regional tracking network, designs a multi - satellite precise orbit determination （ MPOD ） for solving orbit and clock parameters simultaneously and analyzes the radial accuracy of hybrid constella- tion in regional stations. The experiments show that the 3 - dimensional position accuracy is better than 2m, the radial accuracy of 2 - hour orbital prediction for GEO satellites based on laser data validations is better than 0.3m and the accuracy of 6 - hour orbital prediction is better than 0.4m.