The first geodetic VLBI experiment at 22 GHz between Japan and Italy

Details The first geodetic VLBI experiment at 22 GHz between Japan and Italy The first geodetic VLBI experiment at 22 GHz between Japan and Italy

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..341t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 341-348

Astronomy and Astrophysics

Astronomy

Atmospheric Effects, Calibrating, Extremely High Frequencies, Geodetic Surveys, Radio Antennas, Radio Telescopes, Very Long Base Interferometry, Quasars, Radio Astronomy, Radio Receivers

Scientific paper

Geodetic very long base interferometry (VLBI) experiments are usually conducted at S and X bands. Significant advantages could be gained making observations at a higher frequency band like, for example, the 22 GHz (K band), where many radioastronomical observatories have suitable receivers. In order to check the feasibility and reliability of this new configuration, we organized a VLBI experiment, on February 1991, between the Kashima 34 m antenna in Japan and the Medicina 32 m radiotelescope in Italy. A new phase calibration system, suitable for operation at K band and developed at the Communications Research Laboratory (CRL), was used at that time with both antennas. This phase calibrator utilizes an 'up-conversion' method which can be modified to operate at any other receiving frequency band. From this experiment we obtained correlated amplitudes, delays and delay rates for 152 observations of 31 radio sources. The rms residuals have been found to be 100 ps for delay, and 74 fs/s for delay rate. These values are comparable to present S/X solutions in spite of the fact that, for technical reasons, we have not been able to implement all the possible improvements associated with the K band operation. To overcome the problem of a larger coherence loss due to higher atmospheric instabilities at K band, we have devised a method to compute the correlated amplitudes which accounts for this effect.

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