中国空间科学技术 ›› 2019, Vol. 39 ›› Issue (6): 30-.doi: 10.16708/j.cnki.1000-758X.2019.0047

• 研究探讨 • 上一篇    下一篇

45°(N)纬度带的Klobucharlike电离层延迟季节修正模型与评估

李启航, 王剑, 刘瑞华   

  1. 1 中国民航大学中欧航空工程师学院,天津300300
    2 中国民航大学民航空管研究院,天津300300
    3 中国民航大学电子信息与自动化学院,天津300300
  • 出版日期:2019-12-25 发布日期:2019-12-06

A modified Klobucharlike model of ionosphere delay with consideration for seasons for 45°(N) latitude belt

LI Qihang, WANG Jian, LIU Ruihua   

  1. 1 SinoEuropean Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China
    2 Institute of Air Traffic Management, Civil Aviation University of China, Tianjin 300300, China
    3 College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China
  • Online:2019-12-25 Published:2019-12-06

摘要: 电离层延迟是全球卫星导航系统(GNSS)的主要误差源之一。对于装配GNSS单频接收机的航空器,选择简单有效的Klobuchar广播电离层模型来改正电离层延迟误差,其修正率为50%~60%。针对45°(N)纬度带,提出了更高电离层修正需求。考虑到季节因素对中高纬度地区电离层的显著影响,利用GIMs(Global Ionospheric Maps)分析了昼夜中TEC(Total Electron Content)的峰值和谷值随季节(年积日)的变化,建立了一种适用于45°(N)纬度带的Klobucharlike电离层模型。该模型不增加广播模型系数,新模型的夜间和VTEC高峰时电离层修正率分别达到了82%和80%,表明在穿刺点集中的45°(N)纬度地区使用该模型可以更精确地描述该地区的电离层,帮助航空器实现更高精度的定位。

关键词: Klobucharlike模型, 广播电离层模型, 电离层延迟, 全球定位系统

Abstract: Ionospheric delay is one of the most serious error sources in GNSS (Global Navigation Satellite System). For singlefrequency GNSS aircraft users, it is essential to apply an effective and simple broadcast ionospheric model to mitigate the ionospheric delay. The classical Klobuchar ionospheric model has a relative error of 50%~60%. In 45°(N) belt, a higher accuracy of correcting is needed. Considering the significant impact of season on the ionosphere in middle and high latitudes, GIMs (Global Ionospheric Maps) were analyzed for the variation of nighttime TEC (Total Electron Content) valleys with seasons and the variation of daytime TEC peaks with seasons. By improving the amplitudes of the cosine term and nighttime term in the classical model without adding extra coefficient, a Klobucharlike ionospheric model suitable for flightcongested latitudes was proposed. With GIM as a reference, the ionospheric relative errors of the new model for nighttime and for daytime reach 82% and 80% respectively,suggesting the new model has the better accuracy in depicting the ionospheric delay of the area.

Key words: Klobucharlike model, broadcast ionospheric model, ionospheric delay;global positioning system