Holographic measurement of the 26m HartRAO telescope

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dc.contributor.author Klein, Benjamin
dc.date.accessioned 2009-05-08T10:08:02Z
dc.date.available 2009-05-08T10:08:02Z
dc.date.issued 2009-05-08T10:08:02Z
dc.identifier.uri http://hdl.handle.net/10539/6936
dc.description.abstract Microwave holography is a well established method of using the Fourier relationship between an antenna’s current distribution and its complex beam-pattern to produce surface maps of large parabolic antennas. As the final part of a surface upgrade, a holographic map of the HartRAO 26 m telescope was produced. This showed that the surface has an RMS error of 0.45 mm. The measurement used a small reference dish to correlate against and retrieve amplitude and phase values. Due to system phase instabilities, this dish had to be attached to the measured antenna in order to enable sharing a high frequency local oscillator (LO). The movement was modelled and corrected for. However, a slight distortion remained. It is recommended that, either the LO distribution system is stabilised by using multiple PLLs or amplifiers and low loss cables are used to enable moving the reference antenna to a stationary position. en
dc.language.iso en en
dc.subject Holography en
dc.subject Microwave en
dc.subject Phase-stabilisation en
dc.title Holographic measurement of the 26m HartRAO telescope en
dc.type Thesis en


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