Investigation of refraction effects for small GPS networks

Master Thesis

1991

Permanent link to this Item
http://hdl.handle.net/11427/18308
Files
thesis_ebe_1991_christiaans_johan.pdf (1.53 MB)
Authors
Christiaans, Johan
Supervisors
Merry, Charles
Journal Title
Link to Journal
Journal ISSN
Volume Title
Publisher
Publisher

University of Cape Town

Department
School of Architecture, Planning and Geomatics
Faculty
Faculty of Engineering and the Built Environment
License
Series
Abstract
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.
Description
Keywords
GPS Networks
Global Positioning Systems

Reference:

Christiaans, J. 1991. Investigation of refraction effects for small GPS networks. University of Cape Town.

Collections
Masters