1-GHz Bandwidth Digital Spectro-Correlator System for the Nobeyama Millimeter Array

摘要: We have developed 1-GHz bandwidth digital spectro-correlator system for the Nobeyama Millimeter Array (NMA). It consists of 2Gsample/sec-2bit analog-to-digital (A/D) converters and an ultra-wide band correlator. two kinds special-purpose LSI having functions delay compensation correlation, respectively. With these LSIs, correlator realizes 1024-MHz spectroscopy with 128-channel resolution 15-correlation data. This allows us to observe radio continuum emission about a two-times better signal-to-noise ratio than that previous system. started common-use observations this new from 1997 March; has been extended in order obtain 21-correlation data 7-element "Rainbow" (NMA + 45-m telescope) interferometer