DocumentCode :
1044706
Title :
Beam pointing errors of long line sources
Author :
Leichter, M.
Author_Institution :
System Development Corp., Santa Monica, CA, USA
Volume :
8
Issue :
3
fYear :
1960
fDate :
5/1/1960 12:00:00 AM
Firstpage :
268
Lastpage :
275
Abstract :
The relation between the statistics of the antenna beam pointing direction and the phase and amplitude errors at the source has been obtained to first order in the mean-square errors, under certain restrictions, for long line sources. It is shown that when the desired phase at the source is a constant, the results are, to first order, independent of the amplitude errors. When the desired amplitude is also constant, there is a simple formula for computing the allowable rms-phase error at the source when the pointing direction is required to lie in a given angular range with a given probability. When the amplitude distribution corresponds to the Taylor-modified (\\sin x)/x pattern, the allowed rms-phase error is obtained from the constant-amplitude case by a multiplicative factor which depends only on the one parameter characterizing the Taylor distribution. This function is plotted for the range corresponding to sidelobe ratios of 13.2 to 40 db. At 40 db the allowed rms-phase errors are about three fourths of the allowed rms-phase errors at 13.2 db (constant amplitude) for the same uncertainty in the pointing direction. The results are applied to a hypothetical example and to an actual "Mills Cross" for illustrative purposes.
Keywords :
Antenna tolerance analysis; Line source antennas; Aircraft; Cities and towns; Directive antennas; Error analysis; Microwave antenna arrays; Milling machines; Performance analysis; Phased arrays; Radio astronomy; Uncertainty;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IRE Transactions on
Publisher :
ieee
ISSN :
0096-1973
Type :
jour
DOI :
10.1109/TAP.1960.1144851
Filename :
1144851
Link To Document :
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