Digital Signal Processing Using Stream High Performance Computing

Kocz, J.; Greenhill, L. J.; Barsdell, Benjamin R.; Price, D. C.; Bernardi, G.; Bourke, S.; Clark, Michael A.; Craig, John L.; Dexter, Matt; Dowell, Jayce; Eftekhari, T.; Ellingson, S.W.; Hallinan, Gregg; Hartman, J. M.; Jameson, A.; MacMahon, David H. E.; Taylor, G. B.; Schinzel, F. K.; Werthimer, Dan

doi:10.1142/s2251171715500038

Cited by 56 publications

(47 citation statements)

References 12 publications

(10 reference statements)

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“…These results show the vast capabilities o®ered by digital receivers at standalone radio telescopes (Kocz et al, 2015) as well as in multi-telescope observations. (b) LF radio observations (below 100 MHz) are of particular astrophysical interest due to non-thermal emission mechanisms and related physical processes that operate at these frequencies.…”

Section: Introductionmentioning

confidence: 60%

Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT

Захаренко

Konovalenko

Zarka

et al. 2016

J. Astron. Instrum.

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This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, digital receivers performing on-the-°y dynamic spectrum calculations or waveform data recording without data loss have been used at the UTR-2 radio telescope, the URAN VLBI system, and the GURT new generation radio telescope. Here, we detail these receivers developed for operation in the strong interference environment that prevails in the decameter wavelength range. Data collected with these receivers allowed us to discover numerous radio astronomical objects and phenomena at low frequencies, a summary of which is also presented.

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Section: Introductionmentioning

confidence: 60%

Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT

Захаренко

Konovalenko

Zarka

et al. 2016

J. Astron. Instrum.

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“…The OVRO-LWA (full technical details available at [35]) provides an ideal testing ground for both the development of a self-trigger, and verifying the utility of existing arrays for detecting cosmic rays. With few computational restrictions, different avenues can be explored and it can be determined whether air shower detection without the confirmation from particle detectors is at all feasible, let alone the more challenging task of radio detection of τ neutrinos.…”

Section: The Ovro-lwamentioning

confidence: 99%

“…Having all signals brought back to a central location (as opposed to beamforming in the field, for instance), as well as possessing a versatile digital backend [35], enable a wide variety of techniques to be quickly prototyped and validated. As well as being a powerful and commensal cosmic ray experiment, running a sensitive and efficient self-trigger at the OVRO-LWA can be a first step in proving the feasibility of proposed neutrino arrays and is an important step towards an independent method of air shower detection.…”

Section: The Ovro-lwamentioning

confidence: 99%

Self-triggered radio detection and identification of cosmic air showers with the OVRO-LWA

Monroe

Wolf

Hallinan

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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A successful ground array Radio Frequency (RF)-only self-trigger on 10 highenergy cosmic ray events is demonstrated with 256 dual-polarization antennas of the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA).This RF-only capability is predicated on novel techniques for Radio Frequency Interference (RFI) identification and mitigation with an analysis efficiency of 45% for shower-driven events with a Signal-to-noise ratio 5 against the galactic background noise power of individual antennas. This technique enables more efficient detection of cosmic rays over a wider range of zenith angles than possible via triggers from in-situ particle detectors and can be easily adapted by neutrino experiments relying on RF-only detection. This paper discusses the system design, RFI characterization and mitigation techniques, and initial results from 10 cosmic ray events identified within a 40-hour observing window. A design for a future optimized commensal cosmic-ray detector for the OVRO-LWA is presented, as well as recommendations for developing a similar capability for other experiments -these designs either reduce data-rate or increase sensitivity by an order of magnitude for many configurations of radio instruments.

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“…Full cross-correlation of 512 inputs (256 antennas×2 polarizations) by the Large-Aperture Experiment to Detect the Dark Age (LEDA) correlator (Kocz et al 2015) provides a full-sky field of view with an approximately 10 arcmin resolution at the top of the observing band. Data are continuously written to a multiday buffer.…”

Section: Ovro-lwamentioning

confidence: 99%

A Simultaneous Search for Prompt Radio Emission Associated with the Short GRB 170112A Using the All-sky Imaging Capability of the OVRO-LWA

Anderson

Hallinan

Eastwood

et al. 2018

ApJ

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We have conducted the most sensitive low-frequency (below 100 MHz) search to date for prompt, low-frequency radio emission associated with short-duration gamma-ray bursts (GRBs), using the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA). The OVRO-LWA's nearly full-hemisphere field of view (∼20,000 square degrees) allows us to search for low-frequency (sub-100 MHz) counterparts for a large sample of the subset of GRB events for which prompt radio emission has been predicted. Following the detection of short GRB 170112A by Swift, we used all-sky OVRO-LWA images spanning one hour prior to and two hours following the GRB event to search for a transient source coincident with the position of GRB 170112A. We detect no transient source to within a 3σ flux density limit of 4.5Jy at 13 s timescales for frequencies spanning 27-84MHz. We place constraints on a number of models predicting prompt, low-frequency radio emission accompanying short GRBs and their potential binary neutron star merger progenitors, and place an upper limit of L radio / L γ 3.5×10−6 on the fraction of energy released in the prompt radio emission, under the assumptions of negligible scattering of the radio pulse and beaming of emission along the line of sight. These observations serve as a pilot effort for a program targeting a wider sample of both short and long GRBs with the OVRO-LWA, including bursts with confirmed redshift measurements that are critical to placing constraining limits on prompt radio emission models, as well as a program for the follow-up of gravitational wave compact binary coalescence events detected by advanced LIGO and Virgo.

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Digital Signal Processing Using Stream High Performance Computing

Cited by 56 publications

References 12 publications

Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT

Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT

Self-triggered radio detection and identification of cosmic air showers with the OVRO-LWA

A Simultaneous Search for Prompt Radio Emission Associated with the Short GRB 170112A Using the All-sky Imaging Capability of the OVRO-LWA

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