Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpeee..11....7a&link_type=abstract
In its USSR Rept.: Electron. and Elec. Eng. (JPRS-UEE-84-012) p 7 (SEE N85-14991 06-31) Transl. into ENGLISH from Izv. Vyssh.
Astronomy and Astrophysics
Astronomy
Antenna Radiation Patterns, Radio Interferometers, Radio Sources (Astronomy), Fourier Transformation, Radio Frequency Interference, Signal To Noise Ratios, Spectral Resolution, Time Lag, Transmission Lines
Scientific paper
Using the very-long-baseline astrometric radiointerferometer at the Scientific-Research Institute of Radiophysics as a model and reference, a short-baseline decimetric-wave radiointerferometer with scale communication lines between antennas was developed and designed for measuring the modulus of the visibility function of radioemission sources. Operation of this radiointerferometer was checked first in the laboratory and then in the field against several extraterrestrial radioemission sources (3C 273, Cygnus-A). Although the peak of the interferometer response curve is generally a function of delay time and interference frequency, here the correlational envelope of received radioemission represents the radiation pattern with respect to time delay and is such that it increases the noise immunity of the system by suppressing wideband correlational noise at the instant of observation. Fourier analysis of interference fluctuations with high spectral resolution in real time does, furthermore, facilitate discrimination of the useful signal from correlational noise. It is also possible here to attain very long periods of coherent pickup, necessary for measurement of power fluxes from sources which are regarded as point sources relative to the baseline.
Alekseyev V. A.
Kryukov Yevgen A.
Lipatov B. N.
Sizov A. S.
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