GPS与Galileo系统组合应用精度分析

Analysis on Combined Application of Galileo and GPS Systems

从GPS与Galileo系统共用频段角度出发,简要论述了两大系统频率和信号计划。详细分析了BOC调制体制下GPS和Galileo系统各项误差源对用户等效距离误差影响,其中包括了接收机伪随机码测距噪声误差、电离层误差和多路径误差等。根据GPS、Galileo系统和GPS+Galileo系统组合3种情况下卫星几何分布,分析给出了3种情况下的定位精度结果。

Galileo and GPS have a common center frequency on L1,so the combined processing of signals from Galileo and GPS raises the possibility of offering a better positioning and navigation solution.This paper first introduces the frequency band and signal situation of Galileo and GPS systems.The different sources of error that contribute to the User Equivalent Range Error(UERE)are estimated,such as the ranging error caused by ionospheric refraction,multipath,receiver ranging error,etc.Then,the total UEREs of Galileo and GPS are calculated.As a conclusion,this paper presents the theoretically expected positioning and navigation performance of Galileo and GPS,each alone,as well as the one of a combined service.