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Decoherence in LOFAR-VLBI beamforming

Bonnassieux, Etienne; Edge, Alastair; Morabito, Leah; Bonafede, Annalisa

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Etienne Bonnassieux

Annalisa Bonafede


We show that the use of a superstation (a phased array created using multiple stations of an interferometric array) created in post-processing for LOFAR-VLBI observations introduces a direction-dependent loss of signal in the image. We show this effect using simulations and real data. Using the RIME formalism, we characterise it fully, and give limits under which this signal loss is negligible. Finally, we show that we are able to fully predict this effect. We close with guidelines for interferometric observers to avoid this effect in their observations, and a discussion of techniques which could limit this effect or do away with it entirely. The latter in particular will be relevant to the SKA should its long baselines be used to their fullest potential.


Bonnassieux, E., Edge, A., Morabito, L., & Bonafede, A. (2020). Decoherence in LOFAR-VLBI beamforming. Astronomy & Astrophysics, 637, Article A51.

Journal Article Type Article
Acceptance Date Mar 13, 2020
Online Publication Date May 13, 2020
Publication Date 2020-05
Deposit Date Jun 17, 2020
Publicly Available Date Jun 17, 2020
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 637
Article Number A51


Published Journal Article (5.2 Mb)

Copyright Statement
Bonnassieux, Etienne, Edge, Alastair, Morabito, Leah & Bonafede, Annalisa (2020). Decoherence in LOFAR-VLBI beamforming. Astronomy & Astrophysics 637: A51, reproduced with permission, © ESO.

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