Temperature dependence of the HartRAO pointing model

Copley, Charles Judd (2008) Temperature dependence of the HartRAO pointing model. Masters thesis, Rhodes University.




This thesis investigates control aspects of the Hartebeeshoek Radio Astronomy Observatory (HartRAO) antenna. The installation of a new 22 GHz receiver has required the pointing accuracy to be improved to less than 4 mdeg. The effect of thermal conditions on the the HartRAO antenna pointing offset is investigated using a variety of modelling techniques including simple geometric modelling, neural networks and Principal Component Analysis (PCA). Convincing results were obtained for the Declination pointing offset, where applying certain model predictions to observations resulted in an improvement in Declination pointing offset from 5.5 mdeg to 3.2 mdeg (�50%). The Right Ascension pointing model was considerably less convincing with an improvement of approximately from 5.5 mdeg to 4.5 mdeg (�20%) in the Right Ascension pointing offset. The Declination pointing offset can be modelled sufficiently well to reduce the pointing offset to less than 4 mdeg, however further investigation of the underlying causes is required for the Right Ascension pointing offset.

Item Type:Thesis (Masters)
Uncontrolled Keywords:Observatories, South Africa, Antennas, Telescopes
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
Divisions:Faculty > Faculty of Science > Physics & Electronics
ID Code:2616
Deposited By: Mrs Carol Perold
Deposited On:16 Apr 2012 14:07
Last Modified:16 Apr 2012 14:07
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