射电天文研究组知识库

自天文观测进入全波段观测时代以来,全波段中的低频射电信号是新的重要观测波段以及研究窗口。鉴于此波段的信息对于研究太阳以及行星的射电爆发具有重要意义,并且人类对此频段的研究几乎处于空白状态，现在欧美一些国家以及我国都已经适时地开启了相关研究。目前中国科学院云南天文台已经开启了此项目的建设,现已有4台低频射电天线可以测试使用。其低频射电天线阵可以和云南天文台已有的10m太阳射电望远镜以及11m太阳射电望远镜配合使用,用于更精确地观测太阳或者其他行星的射电信息。设计首先由A/D板卡接收来自低频射电天线的低频天文信号，接着A/D板卡把转换的数字信号以差分信号的形式传至现场可编程门阵列板卡；现场可编程门阵列对数据整合处理，通过异步先入先出队列(First Input First Output, FIFO)跨时钟域的形式把数据通过千兆以太网以UDP协议的形式传至PC端；然后PC端设计的软件对传输来的数据做加窗和快速傅里叶变换处理并显示。

Since the astronomical observation took its step into the era of full-wave observations,the low frequency radio signal of full-wave observation has become a new yet important band for observation It also provides a new path for research. Radio information in this band plays an important role in the study of solar and other planets' radio burst,yet related researches in this area are almost in a blank state. Therefore,some countries in Europe and America as well as China have already started to do some related researches. Yunnan Observatories,Chinese Academy of Sciences,has launched this project. Now there are four low frequency radio antennas can be used in this project. The low-frequency radio antenna array can be used cooperatively with the ten-meter solar radio telescope and the eleven-meter solar radio telescope,which are already in service in Yunnan Observatories. Together they can accurately observe the radio information of the Sun and other planets.Of this design,A / D card firstly receives the low frequency astronomical signal from the low frequency radio antenna; then the A / D card passes the converted digital signals to the FPGA card by the form of differential signal; FPGA integrates and processes the data. Besides,FPGA uses a form of asynchronous FIFO clock domain to pass the data to the PC terminal by Gigabit-Ethernet with User Data-gram Protocol; then the software designed by PC terminal window displays the data and the processing of FFT.