GALILEO系统仿真与分析

Simulation and analysis of GALILEO

本文着重阐述了GALILEO仿真系统星座和误差模型的构建过程,利用该系统进行DOP值分析并通过定位解算验证了GALILEO系统的性能指标。通过与GPS系统性能指标进行比较,得出GALILEO系统的星座设计具有较好的DOP值分布特性,定位精度优于GPS定位精度。在进行差分定位时,其误差贡献比较大的是接收机噪声和卫星钟差,因此提高差分定位的关键是降低接收机的噪声水平和提高卫星钟差预报精度。

This paper expands the process of construction constellation and error model of GALILEO simulation system. It analyzes the DOP value and validates the performance index of GALILEO through caculating the position. The conclusion can be drew that the constellation design of GALILEO is provided with better characteristic of DOP value distributing and position precision than GPS. In difference orientation the error mainly comes from the receiver noise and satellite bell error. The key to improve the difference orientation is to reduce the level of receiver noise and improve the forecast precision of satellite bell difference.