DocumentCode :
1032573
Title :
VLBI collimation-tower technique for time-delay studies of a large ground-station communications antenna
Author :
Otoshi, Tom Y. ; Rusch, Willard V T ; Young, Lawrence E.
Author_Institution :
California Inst. of Technology, Pasadena, CA, USA
Volume :
33
Issue :
5
fYear :
1985
fDate :
5/1/1985 12:00:00 AM
Firstpage :
549
Lastpage :
556
Abstract :
A need for an accurate but inexpensive method for measuring time delays of large ground antennas for very long baseline interferometry (VLBI) applications motivated the development of the collimation-tower technique described. Supporting analytical work that was performed primarily to verify time-delay measurement results obtained for a large antenna when the transmitter was at a collimation distance of 1/25 of the usual 
far-field criterion is discussed. Comparisons of theoretical and experimental results are given.
far-field criterion is discussed. Comparisons of theoretical and experimental results are given.Keywords :
Antenna measurements; Delay effects; Radio astronomy; Radio interferometry; Reflector antennas; Antenna measurements; Antenna theory; Aperture antennas; Collimators; Current measurement; Optical transmitters; Radio transmitters; Reflector antennas; Signal analysis; Transmitting antennas;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1985.1143625
Filename :
1143625
Link To Document :
