1-GHz Bandwidth Digital Spectro-Correlator System for the Nobeyama Millimeter Array
1-GHz Bandwidth Digital Spectro-Correlator System for the Nobeyama Millimeter Array
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适用于 Nobeyama 毫米阵列的 1 GHz 带宽数字光谱相关器系统
DOI：
10.1093/pasj/52.2.393
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发表时间：
2000
影响因子：
2.3
通讯作者：
Tamio Hashimoto
中科院分区：
文献类型：
--
作者：
S. Okumura;M. Momose;N. Kawaguchi;T. Kanzawa;T. Tsutsumi;A. Tanaka;Teruaki Ichikawa;T. Suzuki;K. Ozeki;K. Natori;Tamio Hashimoto
我们为野边山毫米波阵（NMA）研制了1GHz带宽的数字光谱相关器系统。它由2G采样/秒-2位A/D转换器和超宽带数字相关器组成。我们开发了两种专用LSI，分别具有延迟补偿和相关功能。有了这些LSI，超宽带数字相关器实现了1024 MHz带宽的光谱，128通道分辨率为15相关数据。该系统使我们能够观察到无线电连续辐射，其信噪比比以前的相关器系统高出两倍。我们从1997年3月开始用这个新系统进行通用观测;该系统已得到扩展，以便为7单元“彩虹”（NMA + 45米望远镜）干涉仪系统获得21个相关数据。
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 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.