BDS/GPS短基线解算的随机模型研究

Study on stochastic models of BDS/GPS short-baseline solution

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。

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.