Journal Article10.1109/jproc.2009.2015683
The Long Wavelength Array
Steven W. Ellingson,Tracy E. Clarke,Aaron Cohen,J. Craig,Namir E. Kassim,Ylva Pihlstrom,Lee J. Rickard,Gregory B. Taylor +7 more
- Vol. 97, pp 1421-1430
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TL;DR: The Long Wavelength Array (LWA) is a new radio telescope designed for high-resolution imaging in the frequency range 10-88 MHz. It will consist of 53 phased array stations distributed over a large region in New Mexico, with image sensitivity of a few millijanskys and resolution of 8'' at 20 MHz.
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Abstract: The Long Wavelength Array (LWA) will be a new multipurpose radio telescope operating in the frequency range 10-88 MHz. Upon completion, the LWA will consist of 53 phased array ldquostationsrdquo distributed over a region about 400 km in diameter in the state of New Mexico. Each station will consist of 256 pairs of dipole-type antennas whose signals are formed into beams, with outputs transported to a central location for high-resolution aperture synthesis imaging. The resulting image sensitivity is estimated to be a few millijanskys (5 sigma, 8 MHz, two polarizations, 1 h, zenith) in 20-80 MHz; with resolution and field of view of (8 '', 8deg) and (2'', 2 deg) at 20 and 80 MHz, respectively. Notable engineering features of the instrument, demonstrated in this paper, include Galactic-noise limited active antennas and direct sampling digitization of the entire tuning range. This paper also summarizes the LWA science goals, specifications, and analysis leading to top-level design decisions.
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Citations
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TL;DR: In this paper, the authors discuss the scientific potential and requirements of low-frequency radio arrays and discuss the constraints for various lunar surface arrays, including the observability constraints imposed by the interstellar and interplanetary medium.
152
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Phased Arrays for Radio Astronomy, Remote Sensing, and Satellite Communications
Karl F. Warnick,Rob Maaskant,Marianna Ivashina,David B. Davidson,Brian D. Jeffs +4 more
- 06 Sep 2018
TL;DR: Find a modern approach to the analysis, modeling and design of high sensitivity phased arrays by combining network theory, numerical methods and computational electromagnetic simulation techniques to enable full system analysis and design optimization.
93
A technique for primary beam calibration of drift-scanning, wide-field antenna elements
Jonathan C. Pober,Aaron R. Parsons,Daniel C. Jacobs,James E. Aguirre,Richard F. Bradley,Richard F. Bradley,Chris Carilli,Nicole E. Gugliucci,David F. Moore,Chaitali R. Parashare +9 more
TL;DR: In this paper, a new technique for calibrating the primary beam of a wide-field, drift-scanning antenna element is presented, which uses an interrelated network of source crossing points.
61
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TL;DR: The Beamforming Elevated Array for COsmic Neutrinos (BEACON) is a planned neutrino telescope designed to detect radio emission from upgoing air showers generated by ultrahigh energy tau neutrinos interactions in the Earth as mentioned in this paper .
Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array
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TL;DR: In this article, the power spectrum analysis of ionospheric fluctuations in MWA data is presented, where the position offsets of radio sources appearing in two datasets are examined. And the authors show that the position shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight.
11
References
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TL;DR: The VLA Low-frequency Sky Survey (VLSS) as discussed by the authors has been used to image 95% of the 3π sr of sky north of δ = -30° at a frequency of 74 MHz (4 m wavelength).
541
Ionospheric Data Assimilation Three‐Dimensional (IDA3D): A global, multisensor, electron density specification algorithm
TL;DR: The Ionospheric Data Assimilation Three-Dimensional (IDA3D), an ionospheric objective analysis algorithm that is capable of incorporating most electron density related measurements including GPS-TEC measurements, low-Earth-orbiting “beacon” TEC, and electron density measurements from radars and satellites.
234
Subarcminute resolution imaging of radio sources at 74 MHz with the very large array
TL;DR: In this paper, a dual-frequency ionospheric phase referencing procedure was developed for a ground-based interferometer which can obtain simultaneous, higher frequency measurements, and showed examples of its application.
108