中文摘要：

基于北斗卫星导航系统／全球定位系统（BeiDou Navigation Satellite System/Global Positioning Sys-tem,BDS/GPS）组合定位的时空基准统一，文章详细介绍了BDS／GPS定位的函数模型和随机模型。在载波相位相对定位的算法基础上，编写BDS／GPS组合定位程序处理实测BDS／GPS短基线数据，从空间位置精度因子（position dilution of precision, PDOP）、整周模糊度固定以及定位精度等多方面分析BDS／GPS组合定位的性能。结果表明：BDS／GPS组合的PDOP值要小于单个系统的值，而且稳定性好，双系统的观测精度好于单个系统；BDS／GPS组合的短基线相对定位中单历元模糊度固定率高达98％，比GPS、BDS单系统单历元模糊度固定率分别提高了4．3％和21．0％。BDS／GPS组合的短基线定位精度在E、N方向定位结果优于1cm，U方向定位结果优于2cm，比单GPS系统在E、N方向定位精度分别提高25％、4．7％，在U方向定位精度提高12．8％。

英文摘要：

Based on the benchmark unity of space and time in BeiDou Navigation Satellite System/Glob- al Positioning System（BDS/GPS） integrated positioning, the BDS/GPS function model and stochastic model are introduced. On the basis of the algorithm of carrier phase relative positioning, the BDS/ GPS integrated positioning program is written to process the measured BDS/GPS short baseline data. Finally, the performance of the BDS/GPS integrated positioning is analyzed from the perspectives of space position dilution of precision（PDOP）, fixation of integer ambiguity and positioning accuracy. The results show that the PDOP value of BDS/GPS integration is less than the value of a single sys- tem and has better stability, and the observation precision of dual system is better than that of a single system. In the short baseline relative positioning of BDS/GPS integration, the single-epoch ambiguity fixed rate can reach up to 98%. Comparing with GPS and BDS single system, it increases by 4.3% and 21.0% respectively. The accuracy of short baseline positioning of BDS/GPS integration is better than 1 cm at E and N directions and 2 cm at U direction. Comparing with GPS single system, the po- sitioning accuracy increases by 25%, 4. 7% and 12.8% correspondingly.