GPS观测值随机特性分析与建模

Analysis and Modeling of GPS Stochastic Characteristics

估计了GPS观测值精度、观测值的时间相关性和不同类型观测值之间的交叉相关性,重点分析观测值精度与高度角的趋势关系,建立能正确反映随机特性且简单实用的高度角加权模型,并从定位精度方面对建立的高度角加权模型进行评估。结果表明:随着卫星高度角的变化,观测值的精度有明显变化;建立的不同高度角加权模型与经验的高度角加权模型相比,在提高定位的可靠性方面有较为显著的改善效果。

The relationship of elevation-dependent measurement precision is evaluated. Based on the computed precision, some easy-to-use elevation-dependent models are then built and further evaluated by using them in GPS positioning. In general, the positioning precision is comparable from the different established stochastic models, while high precision com- pared with the empirical elevation-dependent model.