Experience from geodetic very long baseline interferometry observations at Onsala using a digital backend

• The Onsala Space Observatory has installed amodern digital backend for geodetic and astronomicalVery Long Baseline Interferometry (VLBI). This systemconsists of a Digital Base-Band Converter (DBBC) and aMark 5B+ recorder. From 2011 until late 2014 this newsystem was run for geodetic VLBI observations in paral-lel with the old system consisting of a Mark 4 rack andMark 5A recording system. Several of these observed ses-sions were correlated at the correlator in Bonn includingboth data sets. We present results from the analysis andcomparison of these sessions. Both the original observeddelays and corresponding geodetic parameters are com-pared. No significant differences are detected, for eitherthe raw observations or for the geodetic parameters. Thisshows that the digital backend can be used operationallyfor geodetic VLBI observations.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

digital base-band converter

Mark 4

VLBI2010 Global Observing System

geodetic very long baseline interferometry

VLBI

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