29 citations · 38 across the 8 of their papers we have counts for
11 papers
Multifrequency Array Calibration in Presence of Radio Frequency Interferences
Yassine Mhiri, Mohammed Nabil El Korso, Arnaud Breloy +1
Radio interferometers are phased arrays producing high-resolution images from the covariance matrix of measurements. Calibration of such instruments is necessary and is a critical…
Multi-frequency calibration for DOA estimation with distributed sensors
Martin Brossard, Virginie Ollier, Mohammed Nabil El Korso +2
In this work, we investigate direction finding in the presence of sensor gain uncertainties and directional perturbations for sensor array processing in a multi-frequency scenario.…
Robust distributed calibration of radio interferometers with direction dependent distortions
Virginie Ollier, Mohammed Nabil El Korso, André Ferrari +2
In radio astronomy, accurate calibration is of crucial importance for the new generation of radio interferometers. More specifically, because of the potential presence of outliers…
Bayesian Calibration using Different Prior Distributions: an Iterative Maximum A Posteriori Approach for Radio Interferometers
Virginie Ollier, Mohammed Nabil El Korso, André Ferrari +2
In this paper, we aim to design robust estimation techniques based on the compound-Gaussian (CG) process and adapted for calibration of radio interferometers. The motivation beyond…
Robust Calibration of Radio Interferometers in Multi-Frequency Scenario
Virginie Ollier, Mohammed Nabil El Korso, André Ferrari +2
This paper investigates calibration of sensor arrays in the radio astronomy context. Current and future radio telescopes require computationally efficient algorithms to overcome th…
Robust Calibration of Radio Interferometers in Non-Gaussian Environment
Virginie Ollier, Mohammed Nabil El Korso, Rémy Boyer +2
The development of new phased array systems in radio astronomy, as the low frequency array (LOFAR) and the square kilometre array (SKA), formed of a large number of small and flexi…
Parallel Calibration for Sensor Array Radio Interferometers
Martin Brossard, Mohammed Nabil El Korso, Marius Pesavento +3
In order to meet the theoretically achievable imaging performance, calibration of modern radio interferometers is a mandatory challenge, especially at low frequencies. In this pers…
Bayesian Lower Bounds for Dense or Sparse (Outlier) Noise in the RMT Framework
Virginie Ollier, Rémy Boyer, Mohammed Nabil El Korso +1
Robust estimation is an important and timely research subject. In this paper, we investigate performance lower bounds on the mean-square-error (MSE) of any estimator for the Bayesi…
Relaxed concentrated MLE for robust calibration of radio interferometers
Virginie Ollier, Mohammed Nabil El Korso, Rémy Boyer +2
In this paper, we investigate the calibration of radio interferometers in which Jones matrices are considered to model the interaction between the incident electromagnetic field an…
Calibration of Radio Interferometers Using a Sparse DoA Estimation Framework
Martin Brossard, Mohamed Nabil El Korso, Marius Pesavento +2
The calibration of modern radio interferometers is a significant challenge, specifically at low frequencies. In this perspective, we propose a novel iterative calibration algorithm…
Joint ML calibration and DOA estimation with separated arrays
Virginie Ollier, Mohammed Nabil El Korso, Rémy Boyer +2
This paper investigates parametric direction-of-arrival (DOA) estimation in a particular context: i) each sensor is characterized by an unknown complex gain and ii) the array consi…