Current status of the LOFAR EoR key science project

LVE Koopmans - Proceedings of the International Astronomical …, 2017 - cambridge.org
A short status update on the LOFAR Epoch of Reionization (EoR) Key Science Project (KSP)
is given, regarding data acquisition, data processing and analysis, and current power …

Spatially constrained direction-dependent calibration

S Yatawatta - Monthly Notices of the Royal Astronomical Society, 2022 - academic.oup.com
Direction-dependent calibration of widefield radio interferometers estimates the systematic
errors, along with multiple directions in the sky. This is necessary because with most …

Direction dependent calibration with diffuse radio sky models

S Yatawatta - arXiv preprint arXiv:2401.04428, 2024 - arxiv.org
A fundamental assumption of the data model used in radio interferometric calibration is that
the sky model only consists of compact and discrete radio sources. This assumption breaks …

Radio telescope design optimization using costing constraints: Extrapolating LOFAR costing to the Square Kilometre Array

AJ Boonstra, R Nijboer - Radio Science, 2018 - ieeexplore.ieee.org
In this paper we present a methodology for creating a system design for radio telescopes
based on a fixed cost budget. This methodology builds on the idea to optimize a figure of …

Effects of model incompleteness on the drift-scan calibration of radio telescopes

BK Gehlot, DC Jacobs, JD Bowman… - Monthly Notices of …, 2021 - academic.oup.com
Precision calibration poses challenges to experiments probing the redshifted 21-cm signal
of neutral hydrogen from the Cosmic Dawn and Epoch of Reionization (z∼ 30–6). In both …

Exploring Design Optimisation Techniques of a Radio Telescope Using Fixed Costing Constraints

AA Iyer, GM Prabhu, T Gupta… - Journal of Physics …, 2023 - iopscience.iop.org
Cost optimization is a common problem encountered in the design of telescopes. This paper
comprehensively discusses various radio telescope designs worldwide, focusing on their …

Robust calibration of radio interferometers in multi-frequency scenario

V Ollier, MN El Korso, A Ferrari… - … on Acoustics, Speech …, 2018 - ieeexplore.ieee.org
This paper investigates calibration of sensor arrays in the radio astronomy context. Current
and future radio telescopes require computationally efficient algorithms to overcome the new …

Adaptive ADMM in distributed radio interferometric calibration

S Yatawatta, F Diblen… - 2017 IEEE 7th International …, 2017 - ieeexplore.ieee.org
Distributed radio interferometric calibration based on consensus optimization has been
shown to improve the estimation of systematic errors in radio astronomical observations. The …

Imaging swiFTly: streaming widefield Fourier Transforms for large-scale interferometry

P Wortmann, J Kent, B Nikolic - 2024 - aanda.org
Aims. We describe a scalable distributed imaging algorithm framework for next-generation
radio telescopes, managing the Fourier transform from apertures to sky (or vice versa) with a …

Contributions to robust calibration methods in radio astronomy

V Ollier - 2018 - theses.hal.science
Accurate calibration is of critical importance for new advanced interferometric systems in
radio astronomy in order to recover high resolution images with no distortions. This process …