Abstract
The Onsala Space Observatory has installed a modern digital backend for geodetic and astronomical Very Long Baseline Interferometry (VLBI). This system consists of a Digital Base-Band Converter (DBBC) and a Mark 5B+ recorder. From 2011 until late 2014 this new system was run for geodetic VLBI observations in parallel with the old system consisting of a Mark 4 rack and Mark 5A recording system. Several of these observed sessions were correlated at the correlator in Bonn including both data sets. We present results from the analysis and comparison of these sessions. Both the original observed delays and corresponding geodetic parameters are compared. No significant differences are detected, for either the raw observations or for the geodetic parameters. This shows that the digital backend can be used operationally for geodetic VLBI observations.
References
Böckmann S., Artz T. and Nothnagel A. (2010), ‘VLBI terrestrial reference frame contributions to ITRF2008’, J Geod., 84, 201–219.10.1007/s00190-009-0357-7Search in Google Scholar
Bolotin S., Baver K., Gipson J., Gordon D. and MacMillan D. (2012), The First Release of nuSolve, In: D. Behrend and Baver K.D. (Eds.), ‘IVS 2012 General Meeting Proceedings, NASA/CP-2012-217504’, 222–226.Search in Google Scholar
Deller A., Tingay S., Bailes M. and West C. (2007), ‘DiFX: A Software Correlator for Very Long Baseline Interferometry Using Multiprocessor Computing Environments’, Publications of the Astronomical Society of the Pacific, 119, 853, 318–336.10.1086/513572Search in Google Scholar
Gipson J. (2012), IVS Working Group 4: VLBI Data Structures, In: D. Behrend and Baver K.D. (Eds.), ‘IVS 2012 General Meeting Proceedings, NASA/CP-2012-217504’, 212–221.Search in Google Scholar
La Porta L., Alef W., Bertarini A., Bernhart S., Bruni G., Muskens A., Rottmann H., Roy A. and Tuccari G. (2013), ‘The Bonn Astro/Geo Correlator’, IVS Annual Report, 1, 209–212.Search in Google Scholar
Ma C., Sauber J., Bell L., Clark T., Gordon D., Himwich W. and Ryan J. (1990), ‘Measurement of horizontal motions in Alaska using very long baseline interferometry’, J Geophys. Res.: Solid Earth, 95, B13, 21991–22011.Search in Google Scholar
Mujunen A. and Salminen T. (2013), Final report on Networked Storage on Demand, Technical report, The Joint Institute for VLBI in Europe.Search in Google Scholar
Parsley S., Pogrebenko S., Mujunen A. and Ritakari J. (2003), PCEVN, In: Minh, Y.C. (Ed.), ‘New technologies in VLBI’, Vol. 306 of Astronomical Society of the Pacific Conference Series, 145–152.Search in Google Scholar
Petrachenko W., Behrend D., Hase H., Ma C., Niell A., Schuh H. and Whitney A. (2013), The VLBI2010 Global Observing System (VGOS), In: ‘EGU General Assembly Conference Abstracts’, Vol. 15 of EGU General Assembly Conference Abstracts, 12867.Search in Google Scholar
Takahashi F., Kondo T., Takahashi Y. and Koyama Y. (2000),Wave Summit Course: Very Long Baseline Interferometer, Ohmsha, Ltd.Search in Google Scholar
Tuccari G., Alef W., Bertarini A., Buttaccio S., Comoretto G., Graham D., Neidhardt A., Platania P., Russo A., Roy A.,Wunderlich M., Zeitlhöfler R. and Xiang Y. (2010), DBBC2 backend: Status and development plan, In: D. Behrend and Baver K.D. (Eds.), ‘IVS 2010 General Meeting Proceedings, NASA/CP–2010–215864’, 392–395.Search in Google Scholar
Whitney A., Cappallo R., Aldrich W., Anderson B., Bos A., Casse J., Goodman J., Parsley S., Pogrebenko S., Schilizzi R. and Smythe D. (2004), ‘Mark 4 VLBI correlator: Architecture and algorithms’, Radio Sci., 39, 1. Search in Google Scholar
© 2015 N. Kareinen and R. Haas
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