317 citations · 978 across the 18 of their papers we have counts for
19 papers
Coherent Time-Domain Canceling of Interference for Radio Astronomy
S. W. Ellingson, R. M. Buehrer
Radio astronomy is vulnerable to interference from a variety of anthropogenic sources. Among the many strategies for mitigation of this interference is coherent time-domain canceli…
Sidelobe Modification for Reflector Antennas by Electronically-Reconfigurable Rim Scattering
S. W. Ellingson, R. Sengupta
Dynamic modification of the pattern of a reflector antenna system traditionally requires an array of feeds. This paper presents an alternative approach in which the scattering from…
Characterization and Mitigation of Sinusoidal Carrier Modulation Signals by Short-Term Sinusoidal Analysis
S. W. Ellingson
Most radio signals can be described as a form of sinusoidal carrier modulation. These signals have the property that when observed over a sufficiently short period of time, the wav…
Path Loss in Reconfigurable Intelligent Surface-Enabled Channels
Steven W. Ellingson
A reconfigurable intelligent surface (RIS) employs an array of individually-controllable elements to scatter incident signals in a desirable way; for example, to facilitate links b…
GBTrans: A commensal search for radio pulses with the Green Bank twenty metre telescope
Golnoosh Golpayegani, Duncan R. Lorimer, Steven W. Ellingson +7
We describe GBTrans, a real-time search system designed to find fast radio bursts (FRBs) using the 20-m radio telescope at the Green Bank Observatory. The telescope has been part o…
Design and characterization of the Large-Aperture Experiment to Detect the Dark Age (LEDA) radiometer systems
D. C. Price, L. J. Greenhill, A. Fialkov +24
The Large-Aperture Experiment to Detect the Dark Age (LEDA) was designed to detect the predicted O(100)mK sky-averaged absorption of the Cosmic Microwave Background by Hydrogen in…
Observations of Rotating Radio Transients with the First Station of the Long Wavelength Array
G. B. Taylor, K. Stovall, M. McCrackan +5
Rotating Radio Transients (RRATs) are a subclass of pulsars first identified in 2006 that are detected only in searches for single pulses and not through their time averaged emissi…
Constraining the Rate of Primordial Black-Hole Explosions and Extra Dimension Scale using a Low-Frequency Radio Antenna Array
Sean E. Cutchin, John H. Simonetti, Steven W. Ellingson +2
An exploding primordial black-hole (PBH) may produce a single pulse of electromagnetic radiation detectable at the low-frequency end of the radio spectrum. Furthermore, a radio tra…
Bayesian constraints on the global 21-cm signal from the Cosmic Dawn
G. Bernardi, J. T. L. Zwart, D. Price +7
The birth of the first luminous sources and the ensuing epoch of reionization are best studied via the redshifted 21-cm emission line, the signature of the first two imprinting the…
Practical Limits in the Sensitivity-Linearity Trade-off for Radio Telescope Front Ends in the HF and VHF-low Bands
R. H. Tillman, S. W. Ellingson, J. Brendler
Radio telescope front ends must have simultaneously low noise and sufficiently-high linearity to accommodate interfering signals. Typically these are opposing design goals. For mod…
Detection of Radio Emission from Fireballs
K. S. Obenberger, G. B. Taylor, J. M. Hartman +9
We present the findings from the Prototype All-Sky Imager (PASI), a backend correlator of the first station of the Long Wavelength Array (LWA1), which has recorded over 11,000 hour…
Design and Commissioning of the LWA1 Radio Telescope
S. W. Ellingson, J. Craig, J. Dowell +2
LWA1 is a new large radio telescope array operating in the frequency range 10-88 MHz, located in central New Mexico. The telescope consists of 260 pairs of dipole-type antennas who…
First Light for the First Station of the Long Wavelength Array
G. B. Taylor, S. W. Ellingson, N. E. Kassim +32
The first station of the Long Wavelength Array (LWA1) was completed in April 2011 and is currently performing observations resulting from its first call for proposals in addition t…
The LWA1 Radio Telescope
S. W. Ellingson, G. B. Taylor, J. Craig +10
LWA1 is a new radio telescope operating in the frequency range 10-88 MHz, located in central New Mexico. The telescope consists of 258 pairs of dipole-type antennas whose outputs a…
The First Station of the Long Wavelength Array
Patricia Henning, Steven W. Ellingson, Gregory B. Taylor +6
The Long Wavelength Array (LWA) will be a new multi-purpose radio telescope operating in the frequency range 10-88 MHz. Upon completion, LWA will consist of 53 phased array "statio…
Sensitivity of Antenna Arrays for Long-Wavelength Radio Astronomy
Steven W. Ellingson
A number of new and planned radio telescopes will consist of large arrays of low-gain antennas operating at frequencies below 300 MHz. In this frequency regime, Galactic noise can…
Searching for Transient Pulses with the ETA Radio Telescope
Cameron D. Patterson, Steven W. Ellingson, Brian S. Martin +4
Array-based, direct-sampling radio telescopes have computational and communication requirements unsuited to conventional computer and cluster architectures. Synchronization must be…
Transient Pulses from Exploding Primordial Black Holes as a Signature of an Extra Dimension
Michael Kavic, John H. Simonetti, Sean E. Cutchin +2
An evaporating black hole in the presence of an extra spatial dimension would undergo an explosive phase of evaporation. We show that such an event, involving a primordial black ho…
Cancellation of GLONASS signals from Radio Astronomy Data
S W Ellingson, J D Bunton, J F Bell
Astronomers use the 1612 MHz OH spectral line emission as a unique window on properties of evolved stars, galactic dynamics, and putative proto-planetary disk systems around young…