基于格网化高精度卫星导航定位服务方法的网络RTK精度分析

针对一种在虚拟参考站(VRS)技术基础上，进行改进的基于格网化高精度卫星导航定位服务方法，测试并分析了该方法格网划分分辨率不同对网络实时动态定位(RTK)精度的影响，在常规格网划分条件下，选取动态场景的应用数据，分析了该方法的网络RTK动态应用精度. 测试结果表明:随着格网划分距离增加，网络RTK精度随距离增加会降低. 其中，2′×2′和4′×4′格网划分模式下，定位残差序列除个别异常点外，几乎都在厘米以内，且精度统计相当，故可以选择4′×4′作为常规格网划分，满足少量相对固定的虚拟格网点观测量计算，且定位精度维持在厘米级. 常规格网划分条件下，RTK动态跑车定位水平残差序列为厘米级，高程残差序列在分米级，能够达到动态应用精度要求. 

Analysis of network RTK precision of grid high precision satellite navigation and positioning service method

This paper introduced the grid high precision satellite navigation and positioning service method, which improved the virtual reference station (VRS) method. And analyzed the impact of different virtual grid resolutions to the network real time kinematic (RTK) precision. The performance test was then proceed using the normal grid resolution in the knimatic application to analyze the knimatic network RTK precision. Result shows that the network real time kinematic RTK precision will degrad as the distance increases. The precision of the 2′×2′ and 4′×4′ virtual grid resolutions is nearly the same and both wthin centimeter level, which means that 4′×4′ virtual grid resolution can be as a regular selection, so as to meet the requirements of calculation and positioning accuracy of centimeter level for relatively ficed virtual grid point. In addition, results under the condition of regular grid resolution show that the extent of the horizontal direction residual sequence of the knimatic application is the centimeter level, and the height direction residual sequence is the decimeter level. So that the regular grid resolution can fulfil the requirements of the vehicle dynamic applications.