Measurements for the Performance of the Digital Autocorrelation Spectrometer  

作　　者：Fa-Chun Lu Jarken Esimbek Jian-Jun Zhou Xing-Wu Zheng 

机构地区：[1]National Astronomical Observatories/Urumqi Observatory, Chinese Academy of Sciences, Urumqi830011 [2]Graduate University of Chinese Academy of Sciences, Beijing 100049 [3]Department of Astronomy, Nanjing University, Nanjing 210093

出　　处：《Chinese Journal of Astronomy and Astrophysics》2007年第2期297-303,共7页中国天文和天体物理学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China.

摘　　要：Injecting phase calibration （PCAL） signals to the feed horn of the observation system and analyzing the output response signals of the spectrometer, we measured the working performance of a 4096-channel digital autocalibration spectrometer. The results demonstrate that the spectrometer has a fine working performance： （1） the channels are distributed uniformly in the spectrometer; （2） line drift produces little effect on the observation results; （3） spectral resolution shows little changes with observation time. The distribution of the frequency resolution in an 80 MHz bandwidth was measured. A trial observation on the two molecular spectral lines of H2CO and H110α taken with this spectrometer is described.Injecting phase calibration （PCAL） signals to the feed horn of the observation system and analyzing the output response signals of the spectrometer, we measured the working performance of a 4096-channel digital autocalibration spectrometer. The results demonstrate that the spectrometer has a fine working performance： （1） the channels are distributed uniformly in the spectrometer; （2） line drift produces little effect on the observation results; （3） spectral resolution shows little changes with observation time. The distribution of the frequency resolution in an 80 MHz bandwidth was measured. A trial observation on the two molecular spectral lines of H2CO and H110α taken with this spectrometer is described.

关 键 词：instrumentation spectrometer- ISM： molecules - radio lines ISM 

分 类 号：P161[天文地球—天文学] P111.44