The reconstruction of 3-dimensional electron density distribution with ground-based GPS data and occultation data

Pao Yue-kong Library Electronic Theses Database

The reconstruction of 3-dimensional electron density distribution with ground-based GPS data and occultation data

 

Author: Xu, Zhe
Title: The reconstruction of 3-dimensional electron density distribution with ground-based GPS data and occultation data
Degree: M.Sc.
Year: 2012
Subject: Electrons -- Measurement.
Ionospheric electron density.
Global Positioning System.
Ionosphere.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Land Surveying and Geo-Informatics
Pages: xi, 83 p. : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2598738
URI: http://theses.lib.polyu.edu.hk/handle/200/6936
Abstract: The ionosphere is the space layer where the altitude is from 60KM to 1000KM in the atmosphere. Since Global Positioning System has been designed and applied, GPS signal delay is inevitable especially in the ionosphere. In the ionosphere, the molecular is ionized to delocalized electron by solar radiation, bringing influences to GPS signal by causing delays. Thus, monitoring density and quantity of electrons in ionosphere becomes extremely important. In order to estimate the Total Electron Content (TEC) and the Ionosphere Electron Density (IED), mounts of algorithms and models had been developed by using GPS data. Till now, the TEC and the IED of ionosphere can be well calculated and obtained with the expression of three-dimensional distribution map. This paper aims at constructing and mapping the three-dimensional electron density of ionosphere with IRI-2007 model, GPS ground-based obsetVation data and Low-Earth orbit occultation data in Hong Kong area. In this paper, the 3-D ionosphere distribution reconstruction images are derived from ground-based GPS data and the combination of ground-based data and occultation data. Also the ionosphere vertical profiles are derived from reconstruction results. By comparison of different results, with addition of occultation data, the 3-D images and vertical profiles show better reconstruction quality.

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