地磁暴对北斗用户伪距定位的影响分析  

Analysis on the influence of geomagnetic storm of BDS pseudorange positioning

作　　者：王威 刘宸 王宇谱 姜意 许芬[2] WANG Wei;LIU Chen;WANG Yupu;JIANG Yi;XU Fen(Beijing Satellite Navigation Center, Beijing 100094, China;North China University of Technology, Beijing 100144,China)

机构地区：[1]北京卫星导航中心,北京100094 [2]北方工业大学,北京100144

出　　处：《全球定位系统》2019年第1期82-88,共7页Gnss World of China

摘　　要：地磁暴是近地空间经常发生的一种自然现象.发生磁暴时,电离层会发生明显的波动,导致电离层模型改正精度下降,进而影响单频用户定位解算结果.利用哈尔滨、北京、三亚三个地区的观测结果,计算了2017年4月地磁暴发生前后的电离层变化,并分别解算了双频模式、单频基本导航模式和单频增强模式下的伪距定位结果,对比了不同模式定位结果的差异.发现在地磁暴期间,双频定位结果最好,单频增强模式的结果稍逊于双频结果,两种模式一般优于单频基本导航模式.Geomagnetic storms are a natural phenomenon that often occurs in the nearearth space.When a magnetic storm happens,the ionosphere fluctuates significantly,which leads to the reduction of the accuracy of ionosphere correction model and then affects the positioning result of single-frequency user.By using three stations’ observations of Harbin,Beijing and Sanya,we calculate the changes of ionosphere before and after a geomagnetic storm which occurs in April 2017,and then calculate the SPP results of dual-frequency mode,single-frequency basic navigation mode and single-frequency enhancement mode respectively.Comparing the results between different modes,and the results show that,during geomagnetic storms,the results of dual-frequency positioning are the best,and the results of single-frequency enhancement mode are slightly better than that of dual-frequency mode,and the two modes are generally superior to the basic single-frequency navigation mode.

关 键 词：地磁暴 电离层模型 北斗卫星导航系统 伪距定位 广域差分服务 

分 类 号：P228.4[天文地球—大地测量学与测量工程]