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

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 SNAP2 board as a digital baseband converter to digitize, channelize and packetize the received signal. It can be conf...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2021-11, Vol.21 (10), p.248
Main Authors: Pei, Xin, Li, Jian, Wang, Na, Ergesh, Toktonur, Duan, Xue-Feng, Ma, Jun, Chen, Mao-Zheng
Format: Article
Language:English
Subjects:
Converters
Data acquisition
Data acquisition systems
Data loss
Data recording
instrumentation: miscellaneous
Interferometry
Pulsars
Radio telescopes
Recording
site testing
techniques: miscellaneous
Very long base interferometry
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Summary: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 SNAP2 board 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 (QiTai 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.
ISSN:1674-4527
DOI:10.1088/1674-4527/21/10/248