Analysis of inversion errors of ionospheric radio occultation

	Analysis of inversion errors of ionospheric radio occultation
	Wu, X. C. ; Hu, X. ; Gong, X. Y. ; Zhang, X. X. ; Wang, X.
刊名	Gps Solutions
	2009
卷号	13 期号:3 页码:231-239
关键词	Ionospheric radio occultation Error source Simulation Asymmetry of electron density COSMIC electron-density profiles global positioning system atmosphere champ performance venus
ISSN号	1080-5370
通讯作者	北京8701信箱
英文摘要	The retrieved electron density profile of ionospheric radio occultation (RO) simulation data can be compared with the background model value during the simulation and the inversion error can be obtained exactly. This paper studies the inversion error of ionospheric RO through simulation. The sources of the inversion errors are analyzed. The impacts of measurement errors, such as the errors in phase measurements and satellite orbits, are very small and can be neglected. The approximation of straight-line propagation introduces errors at the height of the F1 layer under solar maximum condition. The spherical symmetry approximation of the electron density distribution is found to be the main source of the inversion error. The statistical results reveal some characteristics of the inversion errors. (1) The relative error increases with enhanced solar activity. (2) It is larger in winter than in equinox season, and it is smallest in summer. (3) For all seasons, it is smaller at middle latitude than at other latitudes. (4) For all seasons and geomagnetic latitudes, it is smaller at daytime than at other times. The NmF2 of the ROs from COSMIC are compared with the measurements of ionosondes, and the relative differences show the same dependencies on season, geomagnetic latitude and local time, as the relative errors of the simulated ionospheric ROs.
学科主题	空间环境
收录类别	SCI
原文出处	http://www.springerlink.com/content/rm5662331639v486/fulltext.pdf
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/301]
专题	国家空间科学中心_空间环境部
推荐引用方式 GB/T 7714	Wu, X. C.,Hu, X.,Gong, X. Y.,et al. Analysis of inversion errors of ionospheric radio occultation[J]. Gps Solutions,2009,13(3):231-239.
APA	Wu, X. C.,Hu, X.,Gong, X. Y.,Zhang, X. X.,&Wang, X..(2009).Analysis of inversion errors of ionospheric radio occultation.Gps Solutions,13(3),231-239.
MLA	Wu, X. C.,et al."Analysis of inversion errors of ionospheric radio occultation".Gps Solutions 13.3(2009):231-239.