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

Kocz, J. and Greenhill, L. J. and Barsdell, B. R. and Price, D. and Bernardi, G. and Bourke, S. and Clark, M. A. and Craig, J. and Dexter, M. and Dowell, J. and Eftekhari, T. and Ellingson, S. and Hallinan, G. and Hartman, J. and Jameson, A. and MacMahon, D. and Taylor, G. and Schinzel, F. and Werthimer, D. (2014) Digital Signal Processing using Stream High Performance Computing: A 512-input Broadband Correlator for Radio Astronomy. . (Unpublished)

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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 16.8Tops s^(-1) and 0.236 Tbit s^(-1) throughput in a 9kW envelope and single rack footprint. The output data rate is 260MB s^(-1) for 9 second time averaging of cross-power and 1 second 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.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Kocz, J.0000-0003-0249-7586
Greenhill, L. J.0000-0003-4912-5974
Price, D.0000-0003-2783-1608
Dowell, J.0000-0003-1407-0141
Hallinan, G.0000-0002-7083-4049
Hartman, J.0000-0001-8732-6166
Taylor, G.0000-0001-6495-7731
Schinzel, F.0000-0001-6672-128X
Additional Information:Research presented here was supported by National Science Foundation grants PHY-083057, AST-1106045, AST-1105949, AST-1106059, AST-1106054, and OIA-1125087. The authors acknowledge contribution from the Long Wavelength Array facility in New Mexico, which is supported by the University Radio Observatories program under grant AST-1139974, and National Science Foundation grant AST-1139963. The authors also thank Xilinx and NVIDIA for hardware and software contributions, Digicom Electronics for expedited manufacture and delivery of production ROACH systems and ADCs early in the first production cycle, server vendor Silicon Mechanics for configuration testing, and Blundell, Tong, Leiker, and Kimberk of the Smithsonian Astrophysical Observatory Receiver Lab for expert discussion and construction of critical RF prototypes and field deployable hardware.
Funding AgencyGrant Number
Subject Keywords:Techniques: interferometric; instrumentation: interferometers; instrumentation: miscellaneous
Record Number:CaltechAUTHORS:20190404-133130862
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94464
Deposited By: Tony Diaz
Deposited On:04 Apr 2019 21:06
Last Modified:09 Mar 2020 13:19

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