中文摘要：

基于北斗实测三频数据,通过分析比较选取了三组线性独立的超宽巷组合,采用无几何模式（geometry-free）和几何模式（geometry-based）相结合的方法对其进行单历元模糊度固定,然后恢复各频率上的原始模糊度,最后进行定位解算。实验结果表明,对于短基线,组合系数的合理选取是模糊度成功固定的关键;在选用合适（长波长、弱电离层、低噪声）的组合时,对于静态和动态短基线,其原始载波模糊度单历元固定成功率分别为99.75%和95.08%,从而可以避开传统解算中周跳探测等复杂的数据预处理过程,单历元取得cm级定位精度。

英文摘要：

Based on BDS measured data, three pairs of linear independent extra wide-lane （EWL） com- binations were selected. Then, single epoch ambiguity resolution was carried out with these selected combinations using the combined geometry-free （FG） and geometry-based method （GB）. After this treatment, the original phase ambiguity of each frequency can be resolved. Finally the ambiguity re- solved phase measurements are used for precise positioning. Experimental results show that for short baseline situations, reasonable selection of the combination coefficients is decisive for a high success rate in ambiguity resolution. If the coefficients are selected correctly, the success rate of single epoch ambiguity resolution for original phase measurements is 99.75% in the static mode and 95.08% in the kinematic mode, so that the traditional exhaustive data preprocessing, such as cycle slip detection,can be avoided and a centimeter level positioning result can be achieved reliably.