天文学进展2016，Vol.34Issue(2)：249-257,9.DOI:10.3969/j.issn.1000-8349.2016.02.08
FAST 数字后端及超宽带百万通道频谱仪算法仿真
FAST Digital Backend and Algorithm Simulation for Broadband Million Channel Spectrometer
摘要
Abstract
The National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) will soon finish the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), which will be the most sensitive single-dish radio telescope in the low frequency radio bands between 70 MHz and 3 GHz. To take advantage of its giant aperture, the ongoing self-developing brand-new broadband receiver China Reconfigurable ANalog-Digital backEnd (CRANE) is expected to ensure that it would achieve the best possible overall performance. <br> In hardware, CRANE includes developed parts — FAST Digital Backend (FDB), 3 Gbits/s, 12-bit Analog-to-Digital Converter (FAST3212ADC) — and developing part —Analog Front-end Board (AFB). In its firmware, FPGA-based digital signal processing al-gorithms such as Digital Down Converter (DDC) and Fast Fourier Transform(FFT) will be applied to realize channelization on FDB. CRANE plans to build million channel spectrome-ter which measures a frequency precisely on FDB. We utilize two cascaded FFT to optimize the FFT for large-scale operation. However, the resolution of the first FFT unit would cause the distortion of the output results. The simulation on Matlab shows that final frequency can be restored.关键词
射电望远镜/超宽带接收机/百万通道频谱仪/仿真设计Key words
radio telescope/broadband receiver/million channel spectrometer/simulation design分类
天文与地球科学引用本文复制引用
张夏,俞欣颖,段然,李菂,蒿杰,金乘进..FAST 数字后端及超宽带百万通道频谱仪算法仿真[J].天文学进展,2016,34(2):249-257,9.基金项目
国家自然科学基金(11373045)；天文联合基金(U1531139)；973项目(2012CB821800,2015CB857103) （11373045）
