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Research on Ionospheric Delay Model Based on Dual-Frequency GNSS Signal

Author: LiangXiuJuan
Tutor: MengWeiXiao
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Dual-frequency GNSS signal Ionospheric delay model Vertical total electron content GPS dual frequency receiver Polynomial function models
CLC: P228.4
Type: Master's thesis
Year: 2011
Downloads: 98
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Abstract


GNSS (Global Navigation Satellite System, GNSS) quickly led to the development of many popular interdisciplinary, GNSS meteorology is one of them, is an important discipline the rise in recent years, the use of GNSS satellite atmospheric sounding. In this field of application, GNSS satellite is mainly used to detect the electron density of the water vapor content in the troposphere and ionosphere, is an important tool for weather forecasting and climate monitoring. The delay produced in the GNSS satellites strengths due to the satellite signal propagation in the atmosphere, the atmosphere in the various parameter information contained in this delay. But also because of this delay is the most important, GNSS navigation and positioning accuracy will be greatly reduced. Therefore, to determine the atmospheric delay has become the key to solve all kinds of problems. The accurate determination of atmospheric delay, higher precision navigation and positioning, and more atmospheric parameter information, the more profound understanding of the atmospheric structure, atmospheric delay also can be more accurate measurement. So promote each other, to promote positioning technology and atmospheric measurement techniques common to the rapid development. As atmospheric delay is mainly composed of the ionospheric delay is the focus of research and analysis of objects of this article. The article first starting from the basic refraction theory and ionospheric dispersion effect derived ionospheric delay and ionospheric total electron content (Total Electron Content, TEC), the frequency of the satellite signal. In order to facilitate the study of the ionosphere simplify processing, to establish the ionosphere monolayer model instead of the true ionosphere, thereby introducing vertical total electron content (Vertical Total Electron Content, VTEC) and projection function, VTEC dual-frequency GNSS signal solution operator relations, provides a theoretical premise for the establishment of the ionospheric delay model based on the dual-frequency GNSS signal. The data from GPS dual frequency receiver, the paper describes the use of the method and establish VTEC ionospheric delay model. Followed by the presentation and comparison of several ionospheric delay model, combined with research on the basic theory of the functional form of these models, features, and application of research and analysis, conditions for single station local regional observations, selected the VTEC polynomial function model as the object of the subject experiments. Finally, create a model of VTEC polynomial function method and experimental process. GPS dual frequency receiver for continuous observation in the field to obtain the relevant data, and data processing and analysis, drawn VTEC thus polynomial function models. Zenith area of ??observation Harbin Institute of Technology in the Science Park VTEC daytime changes summarizes some regularity, the region ionospheric delay model, and the accuracy and applicability of the model analysis and draw some meaningful results.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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