Very long baseline interferometry /VLBI/ system for observation of Jupiter's decametric emissions

Details Very long baseline interferometry /VLBI/ system for observation of Jupiter's decametric emissions Very long baseline interferometry /VLBI/ system for observation of Jupiter's decametric emissions

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982unecr..32..295b&link_type=abstract

University of Electro-Communications, Reports, vol. 32, Feb. 1982, p. 295-302. In Japanese, with abstract in English.

Astronomy and Astrophysics

Astronomy

Decametric Waves, Ground Stations, Jupiter (Planet), Planetary Radiation, Radio Emission, Very Long Base Interferometry, Correlation Coefficients, Cross Correlation, Magnetic Recording, Radio Observation, Radio Sources (Astronomy)

Scientific paper

A new VLBI system, constructed in order to study Jupiter's decametric emissions, is discussed. The system is restricted to a stability better than 4 x 10 to the -9th on standard frequency oscillators. The stations are separated by hundreds of kilometers, and the 24.255 MHz signal, the 20 kHz reference frequency, and the JJY time signal are simultaneously recorded on the same magnetic tape. The data is digitized with the aid of 20 kHz and JJY, and the interferometry process is performed by software. The upper limit of the angular diameter is determined by the maximum cross-correlation coefficient, and both the movement of the source and the fluctuation of the phase are deduced from the fringe frequency deviation. The presence of amplitude and phase fluctuation disturbs the measurement of the coefficient and the fringe phase. It is estimated that the total error of the coefficient in this system is + or - 14% at the signal to noise ratio 10 dB.

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