摘要
本文简要介绍了采用一比特自相关技术实现的５１２路数字式自相关频谱仪的工作原理及系统的硬件和软件构成。该频谱仪主要用于分米及厘米波段分子谱线观测。频谱仪系统时钟可在６２５ｋＨｚ至２０ＭＨｚ之间按２的倍率选择。最大分析带宽为１０ＭＨｚ。最高频率分辨率为０．６１ｋＨｚ，相应于１８ｃｍ波段的速度分辨率为０．１ｋｍ／ｓ．文章最后给出了利用上海天文台２５ｍ射电望远镜观测ＯＨ脉泽源的结果。
A 512-channel digital autocorrelation spectrometer was built in 1990 for the observation of interstellar molecular lines.The clock rate of the spectrometer is selectable in the range from 20 MHz to 625 kHz by cascade factors of 2.The maximum analyzing bandwidth is 10MHz.The highest frequency resolution is about 0.61kHz for 312.5kHz analyring bandwidth which correspondes to a velocity resolution of about 0.1km/s at 18cm band. Part of observation results of OH maser sources at 18cm band which was obtained by the 25m radio telescope at shanghai Observatory in 1992 are given.
出处
《天文学报》
CSCD
北大核心
1995年第1期80-85,共6页
Acta Astronomica Sinica
