摘要
介绍了一种GNSS L1和L2信号及测距码失锁率统计计算方法,并考察了不同卫星高度角对失锁率计算结果的影响.利用全球GNSS观测数据,分析了第23太阳活动周发生的两次巨烈磁暴期间GNSS观测信号的质量.结果表明:巨烈磁暴发生期间GNSS L1和L2信号及P1和P2码失锁率较平静日均显著增加,信号失锁主要发生在磁暴主相及恢复相前期.L2失锁率明显高于L1且失锁持续时间更长,表明L2比L1更易受到磁暴影响.GNSS信号失锁率与磁暴指数SYM-H的高相关性表明信号失锁率的异常增加由巨烈磁暴所驱动.研究成果可为我国北斗卫星导航系统全球信号质量评估提供方法支持.
A method for calculating the rate of loss-of-lock(LOL)at carrier phase and pseudo-range measurements of GNSS L1 and L2 was introduced,and the impacts of different satellite elevation angles on the LOL rate were also investigated.Using global GNSS observations,the qualities of GNSS signals during two strong geomagnetic storms at the 23rd solar cycle were analyzed.The results showed that the LOL rates of L1,L2,P1 and P2 signals significantly increased during strong geomagnetic storms comparing with the quiet days.The LOL mainly occurred in the main phase and the early recovery phase of the storm.The LOL rate of L2was significantly higher than L1,and the LOL duration was longer.This means the L2 was more sensitive to geomagnetic storm than L1.The high correlation between the LOL rate and SYM-H index indicated that the abnormal increase of global LOL rate was driven by the strong geomagnetic storm.The results could provide methodological support for the assessment of signal quality of the Beidou navigation satellite system.
作者
贺黎明
张世旋
吴立新
HE Li-ming;ZHANG Shi-xuan;WU Li-xin(School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第10期1480-1486,共7页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(41771416,41104104)
武汉大学地球空间环境与大地测量教育部重点实验室开放基金资助项目(17-01-03)
中央高校基本科研业务费专项资金资助项目(N180104014)
关键词
全球导航卫星系统
地磁暴
电离层
信号失锁
北斗卫星导航系统
global navigation satellite system
geomagnetic storm
ionosphere
signal loss-of-lock
Beidou navigation
satellite system
