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VGTU talpykla >
Doktorantūros skyrius / Department for Doctoral Studies >
Technologijos mokslų daktaro disertacijos ir jų santraukos >
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http://dspace.vgtu.lt/handle/1/1572
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| Title: | The Assessment of the Influence of Solar Storming on Geodetic Coordinates Determined by Global Navigation Satellite System |
| Other Titles: | Saulės audrų įtakos geodezinėms koordinatėms, nustatomoms globaline navigacine palydovine sistema, tyrimas |
| Authors: | Zubinaitė, Vilma |
| Issue Date: | 2012 |
| Publisher: | VGTU leidykla „TECHNIKA“ |
| Citation: | Zubinaitė, V. 2012. The Assessment of the Influence of Solar Storming on Geodetic Coordinates Determined by Global Navigation Satellite System: doctoral dissertation. Vilnius: Technika. 120 p. |
| Description: | Solar storms are the big error source affecting global navigation satellite system (GNSS) satellites’ orbits. Navigation and positioning systems are affected, in one way or another, by different kinds of solar storms. Much work has been done to investigate and model the extent of the errors produced by solar activity. However, most research has concentrated on ionospheric errors because these are thought to be most significant. So we think that the influence of the solar activity to the accuracy of the global navigation satellite system is not enough investigated.
The dissertation consists of an introduction, four chapters and general conclusions. The introduction presents the problem and its topicality. The purposes and task of the work are formulated, and the methods used and the novelty of solutions is described. The author’s publications and structure of the thesis are presented.
Chapter 1 deals with the review of scientific literature. This chapter covers the major components of the field of solar storm activities studies, describes the current state of knowledge in this field, and presents some analysis and results that are necessary as theoretical background for the study of space weather activity and relationship to ground positioning.
Chapter 2 concerns the relevant theoretical issues. This chapter provides a review of the necessary orbital theory to introduce the methods to obtain GNSS satellite and ground receiver positions, as well as demonstrating the idea of finding out which satellites are in eclipse.
Chapter 3 deals with the analysis of the satellite’s orbit changes in the zone of the Earth’s shadow. The original algorithms and computer procedures for the detection of the satellites in the zone of eclipse are presented.
Chapter 4 gives an account of the investigations and determinations of the effects of specific solar storming events to vector positioning on the Earth surface. Author presents an original suggestion to distinguish vectors to short, middle length and long. The dissertation investigates the errors that are caused due to inaccuracies in the orbital parameters transmitted by the satellites. The orbital parameters transmitted by the satellites are compared with precise satellites’ orbits, and calculated vector’s components – with the most reliable values. Finally, the influence of the solar storming events on the precision of the point’s geodetic coordinates is shown.
The author has published six articles related to these issues, i.e. five articles in reviewed scientific periodical publications; one article in of the proceedings of the international conference, while there was made six presentations at conferences. |
| URI: | http://dspace1.vgtu.lt/handle/1/1572 |
| ISBN: | 978-609-457-406-1 |
| Appears in Collections: | Technologijos mokslų daktaro disertacijos ir jų santraukos
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