基于高性能芯片的射电天文厘米-分米波谱线观测方法  

A New Method to Observe Radio Astronomy Signal:Centimeter-Decimeter Spectral Line—Based on High Performance Integrated Circuit

作　　者：印琪骏 朱亮[1,2] 何乐生[1,2,3] 董亮[1,4,2] 刘俊卿[4,2] Yin Qijun Zhu Liang He Lesheng Dong Liang Liu Junqing(College of Information Science and Engineering, Yunnan University, Kunming 650091, China Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China Yunnan Observatories, Chinese Academy of Sciences-Information Technology Science and Engineering Associate Laboratory, Kunming 650091, China Dianehi College of Yunnan University, Kunming 650051, China)

机构地区：[1]云南大学信息学院,云南昆明650091 [2]中国科学院云南天文台-云南大学信息技术联合实验室,云南昆明650091 [3]云南大学滇池学院,云南昆明650051 [4]中国科学院云南天文台,云南昆明650011

出　　处：《天文研究与技术》2017年第1期103-109,共7页Astronomical Research & Technology

基　　金：国家自然科学基金(11303094);国家自然科学基金(U1431113;U1631121);云南省应用基础研究计划面上项目(2015FB189);"西部之光"A类人才计划资助

摘　　要：谱线观测在天文领域起着至关重要的作用,较高的频谱分辨率可以为研究天体细节带来便利,但在高频段谱线观测领域,使用传统的采样方法实现较高的谱线分辨率十分困难。目前,一种利用高性能芯片实现的用于射电天文厘米-分米波谱线观测领域的新方法克服了传统方法的诸多弊端,使用较低的采样带宽就可实现较高的频谱分辨率。这是一套完整的采集、处理、存储方案。首先将高频信号进行模拟下变频处理,再将处理过的低频信号交由上位机软件进行快速傅里叶变换、积分处理,最后保存成需要的文件格式。整个系统的采集参数由观测者通过上位机软件进行配置。Spectral line observation plays an important role in astronomy. High spectral resolution can bring much convenience to observers in exploring planet details. But for high-frequency observation, it is very difficult for the traditional sampling method to achieve high spectral resolution. In this article, a new method has been proposed. Using high performance integrated circuit to observe radio astronomy signal in centimeterdecimeter spectral line, this method overcomes those disadvantages of its traditional counterpart and achieves a higher spectral resolution with a lower sampling bandwidth. It consists of a complete set of collection, processing and storage solutions. Firstly, high-frequency signal is processed by the analog down converter, then the low-frequency signal is transmitted to the upper computer software for FFT and integral processing; finally, the signal is saved in file format as required. In this platform, parameters for data collection are given by the observer through upper computer software.

关 键 词：现场可编程门阵列 捷变收发器 射电天文 谱线观测 频率分辨率 

分 类 号：P161[天文地球—天文学]