Distributed image reconstruction for very large arrays in radio astronomy

André Ferrari (1, 2) , David Mary (1, 2) , Rémi Flamary (1, 2) , Cédric Richard (1, 2)

1 LAGRANGE - Joseph Louis LAGRANGE
2 OCA - Observatoire de la Côte d'Azur

Current and future radio interferometric arrays such as LOFAR and SKA are characterized by a paradox. Their large number of receptors (up to millions) allow theoretically unprecedented high imaging resolution. In the same time, the ultra massive amounts of samples makes the data transfer and computational loads (correlation and calibration) order of magnitudes too high to allow any currently existing image reconstruction algorithm to achieve, or even approach, the theoretical resolution. We investigate here decentralized and distributed image reconstruction strategies which select, transfer and process only a fraction of the total data. The loss in MSE incurred by the proposed approach is evaluated theoretically and numerically on simple test cases.

Domaines: Apprentissage [cs.LG]

André Ferrari, David Mary, Rémi Flamary, Cédric Richard. Distributed image reconstruction for very large arrays in radio astronomy. Sensor Array and Multichannel Signal Processing Workshop (SAM), 2014 IEEE 8th, Jun 2014, Coruna, Spain. ⟨10.1109/SAM.2014.6882424⟩. ⟨hal-01170722⟩