GNSS多系统组合测速模型与精度分析

基于GPS多普勒测速原理,建立了GNSS多系统组合测速数学模型,结合实测数据对GNSS多系统组合的原始多普勒测速、相位一阶中心差分导出多普勒测速及二者组合测速精度进行了分析。结果表明,GNSS多系统组合能够显著提高原始多普勒测速及导出多普勒测速的精度,同时能够在一定范围内提高原始多普勒与导出多普勒组合测速的精度;采用原始多普勒与相位导出多普勒观测值组合,GNSS单系统时能够有效地提高测速精度,GNSS多系统组合效果不明显。 

Velocity Determination Model and its Accuracy Analysis with Multi GNSS

Based on the principle of velocity determiantion with doppler observations, the mathematic model of velocity determination with multi GNSS is introduced and then the accuracy and performance of velocity determination with raw doppler observations,derived doppler observations and the combined observations are tested and analysed.The results show that the combination of multi GNSS can improve the accucary of velocity significantly with raw doppler observations and derived doppler observations.The combination of raw doppler observations and derived doppler observation with single system also can improve accuacy of velocity,but when we use multi GNSS,it does not work very well for lack of rigorous stochastic model.