Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..393o&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.393.
Astronomy and Astrophysics
Astronomy
61
Instrumentation: Interferometers, Radio Continuum: General, Radio Lines: General, Techniques: Signal Processing, Techniques: Spectroscopic
Scientific paper
We have developed 1-GHz bandwidth digital spectro-correlator system for the Nobeyama Millimeter Array (NMA). It consists of 2Gsample/secċ2bit analog-to-digital (A/D) converters and an ultra-wide band digital correlator. We developed two kinds of special-purpose LSI having functions of delay compensation and correlation, respectively. With these LSIs, the ultra-wide band digital correlator realizes 1024-MHz bandwidth spectroscopy with 128-channel resolution for 15-correlation data. This system allows us to observe radio continuum emission with about a two-times better signal-to-noise ratio than that of the previous correlator system. We started common-use observations with this new system from 1997 March; the system has been extended in order to obtain 21-correlation data for a 7-element ``Rainbow'' ( NMA + 45-m telescope ) interferometer system.
Hashimoto Tamio
Ichikawa Teruaki
Kanzawa Tomio
Kawaguchi Noriyuki
Momose Munetake
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