GNSS观测值统一表达及组合PPP解算性能分析

发布时间：2018-08-31 20:57

【摘要】：针对GNSS多系统组合进行PPP定位的问题,推导了GNSS观测值统一表达式;进而给出了基于UofC模型的多系统组合PPP的函数模型和随机模型;最后采用6个IGS观测站24 h观测数据对7种组合模型的PPP进行解算,并从收敛率、收敛速度和定位精度等方面进行了统计分析。实验结果表明,当观测时长为60 min时,GPS/GLONASS/BDS组合PPP收敛性能最好,收敛率为91.7%,平均收敛时间为16.1 min;而BDS PPP收敛性能最差,收敛率仅为32.7%,平均收敛时间为38.4 min。可见,多系统组合有利于提高精密单点定位的解算性能。对于定位精度,在观测时长较短时(如0.5 h),GPS/GLONASS/BDS组合PPP整体上具有最优的定位精度,(N,E)方向偏差和标准差分别为(0.3,0.5)cm和(1.9,4.3)cm;短时间内对流层参数与垂直方向的强相关性,将致使U方向精度较差。
[Abstract]:Aiming at the problem of PPP location by GNSS multi-system combination, the unified expression of GNSS observation value is derived, and the function model and stochastic model of multi-system combination PPP based on UofC model are given. Finally, the 24 h data of 6 IGS stations are used to calculate the PPP of 7 kinds of combined models, and the convergence rate, convergence speed and positioning accuracy are analyzed statistically. The experimental results show that the PPP / GLONASS / BDS combination has the best convergence performance when the observation time is 60 min, the convergence rate is 91.7, the average convergence time is 16.1 min;, the convergence rate of BDS PPP is the worst, the convergence rate is only 32.7th and the average convergence time is 38.4 min.. It can be seen that the combination of multi-system is helpful to improve the performance of precision single-point positioning. For positioning accuracy, the integrated PPP of GPS / GLONASS / BDS has the best overall positioning accuracy in a relatively short observation period (e.g. 0.5 h). The direction deviation and standard deviation of (Nue) are (0.3 / 0. 5) cm and (1. 940. 3) cm; respectively, and the strong correlation between the troposphere parameters and the vertical direction is found in a short period of time, such as (0. 3 ~ 0. 5) cm and (1. 9 ~ 4. 3) cm;, respectively. This will result in poor precision in U direction.
【作者单位】：安徽理工大学测绘学院;
【基金】：国家自然科学基金项目(41404004;41474026) 安徽省自然科学基金项目(1408085QD72) 安徽省博士后基金项目(2015B044) 安徽理工大学校青年基金项目(QN201512)
【分类号】：P228.4

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