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Spacecraft Doppler tracking with a VLBI antennaPreliminary results are reported from Doppler-shift measurements to the Voyager-2 spacecraft at a distance of 26 AU, obtained using the 32-m VLBI antenna at Medicina (Italy) during July and August 1988. The apparatus comprises the el-az antenna, an S-X-band receiver, a hydrogen maser to generate the reference signal, a Mark III VLBI terminal, and a digital tone extractor capable of isolating a tone of known frequency from a noisy signal and giving its phase and amplitude. A signal transmitted in S-band from the NASA Deep Space Network (DSN) station in Australia and retransmitted coherently in X-band by Voyager, was received 7 h 6 min later at Medicina and at the DSN station in Madrid. Sample data are presented graphically and shown to be of generally high quality; further in-depth analysis is under way.
Document ID
19910025818
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Comoretto, G.
(Arcetri Osservatorio Astrofisico, Florence, Italy)
Iess, L.
(CNR Istituto di Fisica dello Spazio Interplanetario, Frascati, Italy)
Bertotti, B.
(Pavia, Universita Italy)
Brenkle, J. P.
(Osservatorio Astrofisico di Arcetri Florence, Italy)
Horton, T.
(JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1990
Publication Information
Publication: Nuovo Cimento C, Serie 1
Volume: 13 C
ISSN: 0390-5551
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
91A10441
Distribution Limits
Public
Copyright
Other

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