中文摘要：

在介绍三频法确定主频率模糊度的基础上，针对RTK工作模式，采用GPS、Galileo和GPS／Galileo系统，在不同基线长度下，分别利用三频法和两频法从确定模糊度的时间、正确率以及定位精度等方面进行分析，总结了不同情况下如何采用导航系统和定位模式，以保证定位精度和可靠性。

英文摘要：

Based on the introduction of main frequency ambiguity （TCAR） determined by three-frequency method, and aiming at the RTK mode, GPS, Galileo and GPS/Galileo are used to analyze how to determine the time, correct ratio and positioning precision of ambiguity by three/two-frequency methods for different baseline lengths of RTK. How to better apply navigation systems and positioning models is summarized so as to insure positioning precision and reliability.