Design of a multi-function high-speed digital baseband data acquisition system  

作　　者：Xin Pei Jian Li Na Wang Toktonur Ergesh Xue-Feng Duan Jun Ma Mao-Zheng Chen 

机构地区：[1]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China [4]Xinjiang Key Laboratory of Microwave Technology,Urumqi 830011,China

出　　处：《Research in Astronomy and Astrophysics》2021年第10期61-72,共12页天文和天体物理学研究（英文版）

基　　金：funded by the National Natural Science Foundation of China(NSFC,Nos.12073066,61931002 and 12073067);the Youth Innovation Promotion Association of Chinese Academy of Sciences(CAS,No.2020063);partly supported by the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administrated by the CAS。

摘　　要：A multi-function digital baseband data acquisition system is designed for the sampling,distribution and recording of wide-band multi-channel astronomical signals.The system hires a SNAP2board as a digital baseband converter to digitize,channelize and packetize the received signal.It can be configured dynamically from a single channel to eight channels with a maximum bandwidth of 4096 MHz.Eight parallel HASHPIPE instances run on four servers,each carrying two NVMe SSD cards,achieving a total continuous write rate of 8 GB s^(-1).Data are recorded in the standard VDIF file format.The system is deployed on a 25-meter radio telescope to verify its functionality based on pulsar observations.Our results indicate that during the 30-minute observation period,the system achieved zero data loss at a data recording rate of 1 GB s^(-1) on a single server.The system will serve as a verification platform for testing the functions of the QTT(Qi Tai radio Telescope)digital backend system.In addition,it can be used as a baseband/VLBI(Very Long Baseline Interferometry)recorder or D-F-engine of correlator/beamformer as well.

关 键 词：instrumentation:miscellaneous techniques:miscellaneous site testing 

分 类 号：P161[天文地球—天文学]