中文摘要：

针对BDS轨道高度存在差异进而影响短基线解算结果的问题，该文利用两组实测数据，研究BDS和BDS／GPS组合系统的短基线解算精度及可靠性，并探讨4种随机模型的性能。结果表明，BDS和BDS／GPS组合系统短基线解算精度能够达到厘米级，且模糊度解算的可靠性更高；4种随机模型性能相当，随着基线长度增加，MINQUE模型的优势降低；不同类型卫星轨道高度差异较大，高度角模型不适宜BDS和BDS／GPS组合系统短基线解算。

英文摘要：

Aiming at the problem that the difference of BDS orbital altitudes affects the precision of short-baseline solution, the paper used two measured BDS/GPS data sets to investigated the performance and reliability of short-baseline solution and discussed the stochastic models of BDS and BDS/GPS com- bined systems. Result showed that the solution precision of BDS system and BDS/GPS combined system could both reach to centimetre-level and the reliabilities would be higher than that of GPS; the perform- ances of four stochastic models were similar, and the performance of MINQUE would degrade as baseline length increases; the elevation model should not be applied in BDS or BDS/GPS combined system directly due to the large differences of orbital altitudes of various types of satellites.