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Investigation of refraction effects for small GPS networks
Using observations from the Global Positioning System (GPS) satellites to determine a three dimensional (3-D) geodetic control network are considered. The repeatability of individual baselines and 3-D vector closures are examined, in order to investigate refraction effects on GPS networks. The effec...
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| Format: | Thesis |
| Language: | English |
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School of Architecture, Planning and Geomatics
2016
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| _version_ | 1867613320404533248 |
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| access_status_str | Open Access |
| author | Christiaans, Johan |
| author2 | Merry, Charles |
| author_browse | Christiaans, Johan Merry, Charles |
| author_facet | Merry, Charles Christiaans, Johan |
| author_sort | Christiaans, Johan |
| collection | Thesis |
| description | Using observations from the Global Positioning System (GPS) satellites to determine a three dimensional (3-D) geodetic control network are considered. The repeatability of individual baselines and 3-D vector closures are examined, in order to investigate refraction effects on GPS networks. The effect on GPS baselines of a height bias in the reference point's coordinates is also investigated. A least squares adjustment program is developed and used to obtain a single consistent set of 3-D coordinates for the Tygerberg Test Network (TTN). The results of two GPS processing packages are compared by means of a conformal transformation. It is concluded that single frequency measurements produce better results than the ionospheric free observable on short baselines. Furthermore, a standard atmospheric model shows an improvement over the Marini model to account for tropospheric refraction. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18308 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:14.045Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | School of Architecture, Planning and Geomatics |
| publisherStr | School of Architecture, Planning and Geomatics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18308 Investigation of refraction effects for small GPS networks Christiaans, Johan Merry, Charles GPS Networks Global Positioning Systems Using observations from the Global Positioning System (GPS) satellites to determine a three dimensional (3-D) geodetic control network are considered. The repeatability of individual baselines and 3-D vector closures are examined, in order to investigate refraction effects on GPS networks. The effect on GPS baselines of a height bias in the reference point's coordinates is also investigated. A least squares adjustment program is developed and used to obtain a single consistent set of 3-D coordinates for the Tygerberg Test Network (TTN). The results of two GPS processing packages are compared by means of a conformal transformation. It is concluded that single frequency measurements produce better results than the ionospheric free observable on short baselines. Furthermore, a standard atmospheric model shows an improvement over the Marini model to account for tropospheric refraction. 2016-03-28T14:39:06Z 2016-03-28T14:39:06Z 1991 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18308 eng application/pdf School of Architecture, Planning and Geomatics Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | GPS Networks Global Positioning Systems Christiaans, Johan Investigation of refraction effects for small GPS networks |
| thesis_degree_str | Master's |
| title | Investigation of refraction effects for small GPS networks |
| title_full | Investigation of refraction effects for small GPS networks |
| title_fullStr | Investigation of refraction effects for small GPS networks |
| title_full_unstemmed | Investigation of refraction effects for small GPS networks |
| title_short | Investigation of refraction effects for small GPS networks |
| title_sort | investigation of refraction effects for small gps networks |
| topic | GPS Networks Global Positioning Systems |
| url | http://hdl.handle.net/11427/18308 |
| work_keys_str_mv | AT christiaansjohan investigationofrefractioneffectsforsmallgpsnetworks |