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电离层E/F 层闪烁对GPS TEC 变化率的影响

尹萍,李清宇   

  1. (taptap下载安装安卓电子信息与自动化学院,天津300300)
  • 收稿日期:2017-12-25 修回日期:2018-03-13 出版日期:2018-10-25 发布日期:2018-11-19
  • 作者简介:尹萍(1970—),女,天津人,副研究员,博士,研究方向为卫星导航(GNSS)技术、电离层/大气层遥感遥测、层析成像与探测.
  • 基金资助:
    国家重点研发计划项目(2016YFB0502402)

Impact of E/F layer ionospheric scintillation on TEC changing rate of GPS

YIN Ping, LI Qingyu   

  1. (College of Electronic Information and Automation, CAUC, Tianjin 300300, China)
  • Received:2017-12-25 Revised:2018-03-13 Online:2018-10-25 Published:2018-11-19

摘要: 电离层闪烁是一种能够降低导航性能的自然现象,主要发生在极区和低纬度地区电离层的不同高度层中,包括E 层和F 层。为研究电离层E/F 层闪烁对地面站估算的GPS TEC(total electron content)变化率指数(ROTI)的不同影响,借助COSMIC 观测系统以及高速率GPS 双频大地测量数据展开详细分析,同时也探讨GISM 模型对其的预测能力。结果表明院电离层E 层发生强闪烁(S4 > 0.6),GPS ROTI 未发生较大变化(ROTI≈0.02 TECU/min);而F 层发生强闪烁时,ROTI 则出现明显变化(ROTI≥2 TECU/min);GISM 模型能够预测香港区域电离层夜间发生的强闪烁(预测值S4≥0.6),但对于白天发生的闪烁模型预测S4 结果均为0,此外,GISM 模型预测结果中对电离层E/F 层闪烁并无区分。

关键词: 电离层E/F 层闪烁, COSMIC, ROTI, GISM 模型

Abstract: As a natural phenomenon which is possible to reduce navigation performance, ionospheric scintillation mainly occurs in different heights of ionosphere layers at polar area and low latitudes including E/F layers; In order to investigate the effects of E/F layer ionospheric scintillation on ROTI estimated by GPS ground stations, COSMIC and high rate GPS dual-frequency geodetic surveying data are used to conduct detailed analyses. Meanwhile, the predicting ability of GISM is also investigated. Result shows that GPS ROTI is small (ROTI≈0.02TECU/min) when E-layer strong scintillation occurs (S4>0.6), however, ROTI becomes very large (ROTI≥2 TECU/min) when F-layer strong scintillation occurs. Take Hong Kong district as instance, GISM is capable to predict ionospheric scintillation occurring at night(S4predictedvalue≥0.6)while predicted S4 value of daytime scintillation is totally zero. Besides, there is no difference between ionospheric scintillation of E/F layers according to GISM predicted results.

Key words: E/F-layer ionospheric scintillation, COSMIC, ROTI, GISM

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