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针对在恶劣观测环境下每个GNSS系统只观测到较少的几颗卫星,采用标准双差模型很难实现整周模糊度固定的问题,该文对GPS/BDS系统间混合双差模型进行研究,利用该模型计算出GPS/BDS系统偏差。在此基础上,利用实验分别对模拟和真实恶劣观测环境下的模糊度固定性能进行分析,实验结果表明,恶劣环境下GPS/BDS系统间混合双差模型表现良好,相较于经典的双差模型可将模糊度固定平均所需时间分别缩短43%和33%,模糊度固定成功率分别提高107%和31%。
In view of the fact that only few satellites are observed for each GNSS system in the harsh observation environment, it is very difficult to adopt the standard double-difference model to fix the integer ambiguity. This paper studies the hybrid double-difference model between GPS / BDS systems , Using the model to calculate the GPS / BDS system deviation. On this basis, experiments were conducted to analyze the performance of the ambiguities fixing performance in both simulated and real harsh environments. The experimental results show that the hybrid double-difference model between GPS / BDS systems performs well in harsh environments. Compared with the classical double difference The model can reduce the time needed to fix the ambiguity by 43% and 33%, respectively, and increase the ambiguity fix success rate by 107% and 31% respectively.