Radio interferometric gain calibration as a complex optimization problem

OM Smirnov, C Tasse - Monthly Notices of the Royal …, 2015 - academic.oup.com
Recent developments in optimization theory have extended some traditional algorithms for
least-squares optimization of real-valued functions (Gauss–Newton, Levenberg–Marquardt …

cubical – fast radio interferometric calibration suite exploiting complex optimization

JS Kenyon, OM Smirnov, TL Grobler… - Monthly Notices of the …, 2018 - academic.oup.com
It has recently been shown that radio interferometric gain calibration can be expressed
succinctly in the language of complex optimization. In addition to providing an elegant …

Radio interferometric calibration using the SAGE algorithm

S Kazemi, S Yatawatta, S Zaroubi… - Monthly Notices of …, 2011 - academic.oup.com
The aim of the new generation of radio synthesis arrays such as LOw Frequency ARray
(LOFAR) and Square Kilometre Array (SKA) is to achieve much higher sensitivity, resolution …

Unified radio interferometric calibration and imaging with joint uncertainty quantification

P Arras, P Frank, R Leike, R Westermann… - Astronomy & …, 2019 - aanda.org
The data reduction procedure for radio interferometers can be viewed as a combined
calibration and imaging problem. We present an algorithm that unifies cross-calibration, self …

Revisiting the radio interferometer measurement equation-II. Calibration and direction-dependent effects

OM Smirnov - Astronomy & Astrophysics, 2011 - aanda.org
Context. Paper I of the series re-derived the radio interferometry measurement equation
(RIME) from first principles, and extended the Jones formalism to the full-sky case …

Robust radio interferometric calibration using the t-distribution

S Kazemi, S Yatawatta - Monthly Notices of the Royal …, 2013 - academic.oup.com
A major stage of radio interferometric data processing is calibration or the estimation of
systematic errors in the data and the correction for such errors. A stochastic error (noise) …

Revisiting the radio interferometer measurement equation-I. A full-sky Jones formalism

OM Smirnov - Astronomy & Astrophysics, 2011 - aanda.org
Context. Since its formulation by Hamaker et al., the radio interferometer measurement
equation (RIME) has provided a rigorous mathematical basis for the development of novel …

Distributed radio interferometric calibration

S Yatawatta - Monthly Notices of the Royal Astronomical Society, 2015 - academic.oup.com
Increasing data volumes delivered by a new generation of radio interferometers require
computationally efficient and robust calibration algorithms. In this paper, we propose …

Nonlinear Kalman filters for calibration in radio interferometry

C Tasse - Astronomy & Astrophysics, 2014 - aanda.org
The data produced by the new generation of interferometers are affected by a wide variety of
partially unknown complex effects such as pointing errors, phased array beams, ionosphere …

Sparsity Averaging Reweighted Analysis (SARA): a novel algorithm for radio-interferometric imaging

RE Carrillo, JD McEwen, Y Wiaux - Monthly Notices of the Royal …, 2012 - academic.oup.com
We propose a novel algorithm for image reconstruction in radio interferometry. The ill-posed
inverse problem associated with the incomplete Fourier sampling identified by the visibility …