摘要
基于IGS全球观测站观测数据及IGS电离层格网数据,分析了2018年8月26日地磁暴事件引发的北半球地区电离层总电子含量(TEC)异常变化和观测数据质量变化。结果表明,北半球TEC异常存在纬度差异,高纬地区响应快,低纬地区异常值变化大;磁暴期间高纬地区观测数据周跳变化明显,数据完整率在北半球范围内都有下降,最大下降出现在高纬地区,达38.65%,数据质量与TEC异常变化规律较为一致。对GPS双频精密单点定位(Precise Point Positioning,PPP)结果进行分析,发现磁暴期间高纬地区测站动态PPP定位误差显著增大,水平和垂直均方根误差增至约0.7m及1.8m,静态PPP部分测站受影响。RTK观测在磁暴期间也存在受影响的可能,表现为固定率下降,定位误差增大。
Based on the observational data from the International GNSS Service(IGS)global tracking stations and IGS ionosphere grid data,an analysis was conducted on the abnormal variations of Total Electron Content(TEC)in the northern hemisphere ionosphere and the changes in data quality during a geomagnetic storm event that occurred on August 26th,2018.The results revealed the following:TEC anomalies in the northern hemisphere showed variations based on latitude.Higher latitude regions exhibited a quicker response to the geomagnetic storm,while lower latitude regions displayed larger fluctuations in abnormal values.During the geomagnetic storm,significant cycle slips in observational data were observed in higher latitude regions.The data completeness rate decreased across the entire northern hemisphere,with the highest drop reaching 38.65% in the higher latitude areas.The changes in data quality were found to be consistent with the patterns of TEC abnormalities.The analysis of PPP results showed that during the geomagnetic storm,there was a significant increase in positioning errors for dynamic PPP in higher latitude regions.The horizontal and vertical root mean square errors increased to approximately 0.7m and 1.8m,respectively.The results of static PPP in some stations were also affected.RTK results were also found to be potentially impacted during the geomagnetic storm,it was evidenced by a decrease in fix rate and an increase in positioning errors.
作者
王尚
娄广振
Wang Shang;Lou Guangzhen(Beijing Zhongtianlutong Intelligent Control Technology Co.Ltd.,Beijing 100124,China;College of Surveying and Geo-Informatics,Shandong Jianzhu University,Jinan 250101,China)
出处
《工程勘察》
2024年第6期57-64,共8页
Geotechnical Investigation & Surveying
关键词
磁暴
电离层TEC
数据质量分析
精密单点定位
RTK
geomagnetic storm
ionospheric TEC
data quality analysis
Precise Point Positioning(PPP)
RTK
