DocumentCode :
1015736
Title :
Telescope surface measurement with two feeds
Author :
Von Hoerner, Sebastian
Author_Institution :
National Radio Astronomy Observatory, Green Bank, WV, USA
Volume :
26
Issue :
6
fYear :
1978
fDate :
11/1/1978 12:00:00 AM
Firstpage :
857
Lastpage :
860
Abstract :
A method is suggested where a reference feed is fixed at the telescope focus, and a second feed has a lateral offset and scans the focal plane. The telescope tracks a celestial radio source, and the receiver measures the phase difference at the two feeds and their (voltage) amplitude ratio. A set of coordinate transformations is applied, after which the surface deviations 
from a paraboloid can be obtained by a Fourier transform. The measuring error is discussed, and the best wavelength is found to be between 14 and 21 rms .
from a paraboloid can be obtained by a Fourier transform. The measuring error is discussed, and the best wavelength is found to be between 14 and 21 rms .Keywords :
Antenna measurements; Antenna mechanical factors; Radio telescopes; Reflector antennas; Antenna measurements; Antennas and propagation; Area measurement; Extraterrestrial measurements; Feeds; Jupiter; Millimeter wave communication; Millimeter wave technology; Radio astronomy; Telescopes;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1978.1141948
Filename :
1141948
Link To Document :
