Digital Signal Processing Using Stream High Performance Computing: A 512-Input Broadband Correlator for Radio Astronomy

Journal of Astronomical Instrumentation

article

J. Kocz¹  L. J. Greenhill¹  B. R. Barsdell¹  D. Price¹  G. Bernardi³  S. Bourke⁵  M. A. Clark¹  J. Craig⁷  M. Dexter⁸  J. Dowell⁷  T. Eftekhari⁷  S. Ellingson⁹  G. Hallinan⁵  J. Hartman²  A. Jameson^1,10  D. MacMahon⁸  G. Taylor⁷  F. Schinzel⁷  D. Werthimer^1,11 

[1] Harvard-Smithsonian Center for Astrophysics 60 Garden Street;Jet Propulsion Laboratory California Institute of Technology;SKA SA;Department of Physics and Electronics, Rhodes University P. O. Box 94;California Institute of Technology 1200 E. California Blvd.;NVIDIA Corporation 2701 San Tomas Expressway;Department of Physics and Astronomy University of New Mexico;Radio Astronomy Laboratory University of California;Bradley Department of Electrical and Computer Engineering Virginia Tech;Centre for Astrophysics and Supercomputing Swinburne University of Technology 1 Alfred Street;Space Sciences Lab, University of California

关键词: Techniques: interferometric;    instrumentation: interferometers;    miscellaneous;   

DOI  :  10.1142/S2251171715500038

学科分类：天文学(综合)

来源: World Scientific Publishing Co. Pte. Ltd.

【 摘 要 】

A “large-N” correlator that makes use of Field Programmable Gate Arrays and Graphics Processing Units has been deployed as the digital signal processing system for the Long Wavelength Array station at Owens Valley Radio Observatory (LWA-OV), to enable the Large Aperture Experiment to Detect the Dark Ages (LEDA). The system samples a ∼100MHz baseband and processes signals from 512 antennas (256 dual polarization) over a ∼58MHz instantaneous sub-band, achieving 16.8Topss−1 and 0.236 Tbits−1 throughput in a 9kW envelope and single rack footprint. The output data rate is 260 MBs−1 for 9-s time averaging of cross-power and 1s averaging of total power data. At deployment, the LWA-OV correlator was the largest in production in terms of N and is the third largest in terms of complex multiply accumulations, after the Very Large Array and Atacama Large Millimeter Array. The correlator’s comparatively fast development time and low cost establish a practical foundation for the scalability of a modular, heterogeneous, computing architecture.

【 授权许可】

Unknown