地磁暴对北斗用户伪距定位的影响分析
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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.
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.
引文
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[8]空间环境预报中心网站.空间环境概述[EB/OL][2018-07-09].http://www.sepc.ac.cn/?p=7401.
[2]程娜,贾小林.基于改进CODE模型的北斗广播电离层模型精度评估[C]//第五届中国卫星导航学术年会,2014.
[3]黄庆铭.地磁暴与电离层骚扰的关系[J].地球物理学报,1988,31(4):471-477.
[4]吴晓莉,韩春好,平劲松.GEO卫星区域电离层监测分析[J].测绘学报,2013,42(1):13-18.
[5]任刚.太阳活动对区域电离层的影响分析[D].西安:长安大学,2013.
[6]刘宸.GNSS导航电离层模型精化研究[D].郑州:解放军信息工程大学,2017.
[7]徐彤.中低纬电离层模型及其异常现象相关研究[D].西安:西安电子科技大学,2009.
[8]空间环境预报中心网站.空间环境概述[EB/OL][2018-07-09].http://www.sepc.ac.cn/?p=7401.