太阳风暴对电离层及BDS用户定位影响分析

Influence analysis of solar storms on ionosphere and BDS user's positioning

为研究太阳风暴对导航定位带来的影响,提高导航定位的精度,以2017年9月6日和2017年9月10日太阳爆发的X9.3级大耀斑和X8.2级耀斑为例,运用北京、三亚、成都BDS实测数据,研究分析太阳风暴前后电离层变化、BDS卫星可用情况,及不同定位模式下伪距定位结果的差异。结果表明:此次太阳风暴引起电离层电子浓度10～30个TECU的异常变化,严重时可达60个TECU;对BDS GEO卫星的可用性造成一定影响,但对位置精度因子的影响可忽略不计;影响BDS单频用户定位精度,但采用双频模式和单频增强模式可有效减小电离层异常带来的影响。

In order to study on the influence of solar storms on navigation positioning for improving the accuracy of navigation,taking the solar flares of class X9.3 broken out on Sept.6,2017 and class X8.2 on Sept.10,2017 as examples,with the observations of Beijing,Sanya and Chengdu,the paper analyzed the ionospheric changes before and after the solar storms,the availability of BDS satellites and the differences of pseudo-range positioning results under different positioning modes.Results showed that:the solar storms caused the anomalous variation of ionospheric electron concentration from 10 to 30 TECU,and in severe cases it’s up to 60 TECU;the availability of BDS GEO satellites was impacted,while the influence on PDOP could be negligible;the positioning accuracy of BDS single frequency users could be effected,however,the modes of dual frequency and single frequency enhancement could be used to effectively reduce the influence of ionospheric anomalies.