DocumentCode :
984045
Title :
Complex-correlation radiometer
Author :
Clapp, R.E. ; Maxwell, J.C.
Author_Institution :
AirTechnology Corporation, Waltham, MA, USA
Volume :
15
Issue :
2
fYear :
1967
fDate :
3/1/1967 12:00:00 AM
Firstpage :
286
Lastpage :
290
Abstract :
The correlation between the signals from the two antennas in a radio interferometer can be described by a complex correlation function. The real and imaginary parts of this function can be measured by a radiometer using two feedback loops to control four noise sources, 
(positive, real), 
(negative, real), 
(positive, imaginary), and 
(negative, imaginary). Theoretical analysis shows the system to be stable against amplifier gain fluctuations, and against moderate fluctuations in the phase shifts of the two amplification channels which are included in the system. Experimental verification is described in a following paper by Hubbard and Erickson [2].
(positive, real), (negative, real), (positive, imaginary), and (negative, imaginary). Theoretical analysis shows the system to be stable against amplifier gain fluctuations, and against moderate fluctuations in the phase shifts of the two amplification channels which are included in the system. Experimental verification is described in a following paper by Hubbard and Erickson [2].Keywords :
Correlations; Radiometry; Delay effects; Extraterrestrial measurements; Feedback loop; Fluctuations; Hybrid junctions; Noise level; Noise measurement; Radio control; Radiometry; Receiving antennas;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1967.1138875
Filename :
1138875
Link To Document :
