中文摘要：

建立了GPS／GALILEO组合单点定位的数学模型，在对各项误差改正的基础上，利用全球多卫星导航系统试验网跟踪站的观测数据，对GPS／GALILEO组合单点定位模型进行了试算。结果表明，当GPS观测卫星较充足时，增加1—2颗GALILEO观测卫星并不能有效地提高组合GPS／GALILEO定位的精度，当GPS观测卫星较少时，组合GPS／GALILEO系统相比单GPS系统，定位精度有较明显的改善。

英文摘要：

A mathematic model of combined GPS/GALILEO single point positioning （SPP） is developed. On the basis of error corrections, the combined GPS/GALILEO SPP model is tested using the data of the MGEX tracking stations. The results indicate that the accuracy of the GPS/GALILEO SPP is not significantly improved when adding only one or two GALILEO satellites when the GPS observation satellites are sufficient. However, in the condition of insufficient number of GPS satellites, the accuracy of the combined GPS/GALILEO SPP is better than the GPS-only SPP.