中文摘要：

针对国内外对北斗三频研究较少的情况,本文采用实际接收数据分析了目前星座结构为5颗GEO卫星,5颗IGSO卫星和4颗MEO卫星的北斗二代系统三路信号（B1、B2、B3）的具体性能;结合实测数据分析B1、B2、3三路信号的信噪比,多径误差以及单点定位精度,推导出处理三频数据的多径误差的数学模型。最后通过实验得知,B3信号的信噪比小于B1、B2,同时较小的多径误差使其定位误差小于B1、B2;研究结果补充了GNSS三频多径误差算法,也在一定程度上对北斗系统三频信号定位性能做出整体评估。

英文摘要：

In view of the insufficiency of domestic and foreign study on three frequency BDS, this paper used the actual receiving satellite data to analyze the specific performance of Beidou-2 navigation system, whose constellation is consist of 5 GEO satellites, 5 IGSO satellites and 4 MEO satellites currently. SNR, multipath error and the accuracy of single-point positioning on different carrier were compared and a mathematical model used to compute the multipath error was developed. Experimental result showed that SNR on B3 was smaller than B1 and B2, while the positioning error on B3 was the least because of the smaller multipath error. This research would supplement the algorithm of calculating the multipath error and give a whole systematic review on the Beidou-2 three frequency system to some extent.