不同电离层模型对北斗共视的精度影响分析

GNSS共视时间传递已成为远程高精度时间同步的主要技术手段之一,我国自主研制的北斗导航系统已经服务于亚太地区,基于北斗共视进行高精度时间传递已成为我国时频领域的研究热点。为了提高导航系统定位精度,需降低或消除导航定位过程中的各类误差,其中电离层为影响北斗共视的主要误差。研究了常用的几种电离层修正算法,利用2014年7月份的观测数据分析不同电离层模型对北斗共视钟差的精度影响,给出了残差标准差和稳定度值。分析结果表明:经各种电离层修正后,钟差精度都有所提高,其中双频电离层修正最优,比VTEC格网模型和Klobuchar模型分别提高22%和30%。对于不同星座,GEO卫星计算的钟差修正后精度明显优于MEO、IGSO卫星。

Analysis of Different Ionospheric Model on the Accuracy of BDS Common-View

GNSS common-view time transfer technology has become one of the main means of remote high-precision time synchronization, China has independently developed the BDS which has been used in the Asia-Pacific region, the high-precision time transfer based on BDS common-view has become the research hot spot of time-frequency fields. In order to improve the positioning accuracy of the navigation system, it is needed to reduce or eliminate the errors of navigation and positioning process, and the ionospheric errors are the main errors on BDS common-view. Several ionospheric correction algorithms are studied, and the data observed in July 2014 are used to analyze the influences of different ionospheric models on the accuracy of the clock difference of BDS common-view, and the standard deviation and stability of value of residual are also presented. The results show that: the accuracy of the clock difference has been improved when conducting various ionospheric corrections, of which dual frequency ionospheric correction has the optimal performance, the accuracy of the clock difference increased by 22% and 30% respectively compared with VTEC grid model and Klobuchar model. And the difference of corrected clock calculated by the GEO satellites has higher precision than those calculated by MEO, IGSO satellite