Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Land Surveying and Geo-Informatics | en_US |
| dc.creator | Fok, Hok-sum | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/2332 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | An ITRF combination model with preferred observation functionals and its solution using generalized condition equations | en_US |
| dcterms.abstract | Providing a stable and accurate reference frame is of the fundamental importance because accurate solution realization of an International Terresterial Reference Frame (ITRF) is essential to the correct interpretation of any geophysical and geologic phenomena. The existing ITRF mathematical model uses the state vectors of different stations derived from a number of terrestrial reference frames as observations. However, the station state vectors are not always directly observed but derived from different space geodetic measurements that may be lack of Earth's center of mass and orientation information, which are necessary for defining a terrestrial reference frame. This thesis aims to demonstrate an alternative approach, called Preferred Observation Functionals (POF) approach, in the solution realization of an international terrestrial reference frame from the combination of a number of auxiliary reference frames. The new formulation takes into account the inherent properties of different space geodesy measurement techniques in the solution. Three alternative formulations are demonstrated using the available TRF data. State Vector (SV) based solution is also presented for comparison with the alternative solutions. The resulting station position and velocity estimates generated from the POF approach are, in general, comparatively more precise than the SV based solution. The results also indicate the actual position difference between station position estimates obtained from the above approaches and ITRF2000 solution realization in each coordinate component are at a few centimeter levels, while the horizontal station velocity estimates generated from both approaches shows a good agreement with the ITRF2000 solution, particularly for those based on the POF approach. Those results present that the alternative combination solutions are not significantly different from the ITRF2000 official solution, but improve upon them by directly accounting for the inherent geometric and physical properties of different space geodesy measurement techniques. | en_US |
| dcterms.extent | xii, 137 leaves : col. ill. ; 30 cm. | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2007 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Phil. | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations. | en_US |
| dcterms.LCSH | Geodesy. | en_US |
| dcterms.LCSH | Mathematical geography. | en_US |
| dcterms.LCSH | Global Positioning System. | en_US |
| dcterms.accessRights | open access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b2145923x.pdf | For All Users | 2.41 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/2332