A real-time, all-sky, high time resolution, direct imager for the long wavelength array

James Kent, Jayce Dowell, Adam Beardsley, Nithyanandan Thyagarajan, Greg Taylor, Judd Bowman

Research output: Contribution to journalArticle

Abstract

The future of radio astronomy will require instruments with large collecting areas for higher sensitivity, wide fields of view for faster survey speeds, and efficient computing and data rates relative to current capabilities.We describe the first successful deployment of the E-field Parallel Imaging Correlator (EPIC) on the LWA station in Sevilleta, New Mexico, USA (LWASV). EPIC is a solution to the computational problem of large interferometers. By gridding and spatially Fourier transforming channelized electric fields from the antennas in real time, EPIC removes the explicit cross-multiplication of all pairs of antenna voltages to synthesize an aperture, reducing the computational scaling from O(n2a ) to O(ng log2 ng), where na is the number of antennas and ng is the number of grid points. Not only does this save computational costs for dense arrays but it produces very high time resolution images in real time. The GPUbased implementation uses existing LWA-SV hardware and the high performance streaming framework, Bifrost. We examine the practical details of the EPIC deployment and verify the imaging performance by detecting a meteor impact on the atmosphere using continuous all-sky imaging at 50 ms time resolution.

Original languageEnglish (US)
Pages (from-to)5052-5060
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume486
Issue number4
DOIs
StatePublished - Jul 1 2019

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correlators
sky
antenna
wavelength
antennas
wavelengths
meteor
image resolution
astronomy
field of view
interferometer
radio astronomy
hardware
electric field
meteoroids
multiplication
radio
interferometers
atmosphere
stations

Keywords

  • Instrumentation: interferometers
  • Techniques: interferometric
  • Telescopes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

A real-time, all-sky, high time resolution, direct imager for the long wavelength array. / Kent, James; Dowell, Jayce; Beardsley, Adam; Thyagarajan, Nithyanandan; Taylor, Greg; Bowman, Judd.

In: Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 4, 01.07.2019, p. 5052-5060.

Research output: Contribution to journalArticle

Kent, James ; Dowell, Jayce ; Beardsley, Adam ; Thyagarajan, Nithyanandan ; Taylor, Greg ; Bowman, Judd. / A real-time, all-sky, high time resolution, direct imager for the long wavelength array. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 486, No. 4. pp. 5052-5060.
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