311 citations · 516 across the 7 of their papers we have counts for
8 papers
Run-Time Monitors Design for Adaptive Radar Systems: A Practical Framework
Pepijn Cox, Mario Coutino, Giuseppe Papari +2
Adaptivity in multi-function radar systems is rapidly increasing, especially when moving towards fully adaptive, cognitive radar systems. However, the large number of available sys…
The AARTFAAC Cosmic Explorer: observations of the 21-cm power spectrum in the EDGES absorption trough
B. K. Gehlot, F. G. Mertens, L. V. E. Koopmans +12
The 21-cm absorption feature reported by the EDGES collaboration is several times stronger than that predicted by traditional astrophysical models. If genuine, a deeper absorption…
Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at from LOFAR
F. G. Mertens, M. Mevius, L. V. E Koopmans +23
A new upper limit on the 21-cm signal power spectrum at a redshift of is presented, based on 141 hours of data obtained with the Low-Frequency Array (LOFAR). The an…
Quantifying Suppression of the Cosmological 21-cm Signal due to Direction Dependent Gain Calibration in Radio Interferometers
A. Mouri Sardarabadi, L. V. E. Koopmans
The 21-cm signal of neutral hydrogen - emitted during the Epoch of Reionization - promises to be an important source of information for the study of the infant universe. However, i…
The first power spectrum limit on the 21-cm signal of neutral hydrogen during the Cosmic Dawn at z=20-25 from LOFAR
B. K. Gehlot, F. G. Mertens, L. V. E. Koopmans +19
Observations of the redshifted 21-cm hyperfine line of neutral hydrogen from early phases of the Universe such as Cosmic Dawn and the Epoch of Reionization promise to open a new wi…
Constrained Least Squares for Extended Complex Factor Analysis
Ahmad Mouri Sardarabadi, Alle-Jan van der Veen, L. V. E. Koopmans
For subspace estimation with an unknown colored noise, Factor Analysis (FA) is a good candidate for replacing the popular eigenvalue decomposition (EVD). Finding the unknowns in fa…
Efficient Calibration of Radio Interferometers Using Block LDU Decomposition
Ahmad Mouri Sardarabadi, Alle-Jan van der Veen, Léon V. E. Koopmans
Having an accurate calibration method is crucial for any scientific research done by a radio telescope. The next generation radio telescopes such as the Square Kilometre Array (SKA…
Radio Astronomical Image Formation using Constrained Least Squares and Krylov Subspaces
Ahmad Mouri Sardarabadi, Amir Leshem, Alle-Jan van der Veen
Image formation for radio astronomy can be defined as estimating the spatial power distribution of celestial sources over the sky, given an array of antennas. One of the challenges…