Title :
Calibration system of BMSTU radio-telescope RT-7.5
Author :
Efremov, V.A. ; Rozanov, B.A.
Author_Institution :
Bauman Moscow State Tech. Univ., Russia
Abstract :
For calibration of 2.2 and 3.3 mm radiometers installed in secondary (Cassegrain) focus of the radiotelescope RT-7.5 the black-body calibrator was designed. The calibrator is destined for successive installation of two levels of calibrating noise signal in two bands simultaneously. Two levels are necessary for determination of origin and brightness temperature scaling factor. Due to the big width of signal beams and necessity of providing equal calibrating signal levels at the two wavelengths, black-body radiators were chosen. Temperatures of the black-body radiators are stabilized at +50°C and +70°C
Keywords :
calibration; radiometers; radiotelescopes; reflector antennas; 2.2 mm; 3.3 mm; 50 degC; 70 degC; Cassegrain focus; RT-7.5 radiotelescope; black-body calibrator; brightness temperature scaling factor; calibrating noise signal; calibration; equal calibrating signal levels; radiometers; secondary focus; signal beams; Bridge circuits; Calibration; Electric resistance; Radio astronomy; Radiometers; Resistors; Switches; Temperature distribution; Temperature sensors; Thermostats;
Conference_Titel :
Physics and Engineering of Millimeter and Sub-Millimeter Waves, 2001. The Fourth International Kharkov Symposium on
Conference_Location :
Kharkov
Print_ISBN :
0-7803-6473-2
DOI :
10.1109/MSMW.2001.947315
