Automated Detection of Antenna Malfunctions in Large-N Interferometers: A Case Study With the Hydrogen Epoch of Reionization Array

Storer, D.; Dillon, J. S.; Jacobs, D. C.; Morales, M. F.; Hazelton, B. J.; Ewall-Wice, A.; Abdurashidova, Z.; Aguirre, J. E.; Alexander, P.; Ali, Z. S.; Balfour, Y.; Beardsley, A. P.; Bernardi, G.; Billings, T. S.; Bowman, J. D.; Bradley, R. F.; Bull, P.; Burba, J.; Carey, S.; Carilli, C. L.; Cheng, C.; Deboer, D. R.; de Lera Acedo, E.; Dexter, M.; Dynes, S.; Ely, J.; Fagnoni, N.; Fritz, R.; Furlanetto, S. R.; Gale-Sides, K.; Glendenning, B.; Gorthi, D.; Greig, B.; Grobbelaar, J.; Halday, Z.; Hewitt, J. N.; Hickish, J.; Huang, T.; Josaitis, A.; Julius, A.; Kariseb, M.; Kern, N. S.; Kerrigan, J.; Kittiwisit, P.; Kohn, S. A.; Kolopanis, M.; Lanman, A.; La Plante, P.; Liu, A.; Loots, A.; Macmahon, D.; Malan, L.; Malgas, C.; Martinot, Z. E.; Mesinger, A.; Molewa, M.; Mosiane, T.; Murray, S. G.; Neben, A. R.; Nikolic, B.; Nunhokee, C. D.; Parsons, A. R.; Pascua, R.; Patra, N.; Pieterse, S.; Pober, J. C.; Razavi-Ghods, N.; Riley, D.; Robnett, J.; Rosie, K.; Santos, M. G.; Sims, P.; Singh, S.; Smith, C.; Tan, J.; Thyagarajan, N.; Williams, P. K. G.; Zheng, H.

doi:10.1029/2021RS007376

We present a framework for identifying and flagging malfunctioning antennas in large radio interferometers. We outline two distinct categories of metrics designed to detect outliers along known failure modes of large arrays: cross-correlation metrics, based on all antenna pairs, and auto-correlation metrics, based solely on individual antennas. We define and motivate the statistical framework for all metrics used, and present tailored visualizations that aid us in clearly identifying new and existing systematics. We implement these techniques using data from 105 antennas in the Hydrogen Epoch of Reionization Array (HERA) as a case study. Finally, we provide a detailed algorithm for implementing these metrics as flagging tools on real data sets.

Automated Detection of Antenna Malfunctions in Large-N Interferometers: A Case Study With the Hydrogen Epoch of Reionization Array

Storer D.;Dillon J. S.;Jacobs D. C.;Morales M. F.;Hazelton B. J.;Ewall-Wice A.;Abdurashidova Z.;Aguirre J. E.;Alexander P.;Ali Z. S.;Balfour Y.;Beardsley A. P.;Bernardi G.;Billings T. S.;Bowman J. D.;Bradley R. F.;Bull P.;Burba J.;Carey S.;Carilli C. L.;Cheng C.;DeBoer D. R.;de Lera Acedo E.;Dexter M.;Dynes S.;Ely J.;Fagnoni N.;Fritz R.;Furlanetto S. R.;Gale-Sides K.;Glendenning B.;Gorthi D.;Greig B.;Grobbelaar J.;Halday Z.;Hewitt J. N.;Hickish J.;Huang T.;Josaitis A.;Julius A.;Kariseb M.;Kern N. S.;Kerrigan J.;Kittiwisit P.;Kohn S. A.;Kolopanis M.;Lanman A.;La Plante P.;Liu A.;Loots A.;MacMahon D.;Malan L.;Malgas C.;Martinot Z. E.;Mesinger A.;Molewa M.;Mosiane T.;Murray S. G.;Neben A. R.;Nikolic B.;Nunhokee C. D.;Parsons A. R.;Pascua R.;Patra N.;Pieterse S.;Pober J. C.;Razavi-Ghods N.;Riley D.;Robnett J.;Rosie K.;Santos M. G.;Sims P.;Singh S.;Smith C.;Tan J.;Thyagarajan N.;Williams P. K. G.;Zheng H.

2022

Abstract

We present a framework for identifying and flagging malfunctioning antennas in large radio interferometers. We outline two distinct categories of metrics designed to detect outliers along known failure modes of large arrays: cross-correlation metrics, based on all antenna pairs, and auto-correlation metrics, based solely on individual antennas. We define and motivate the statistical framework for all metrics used, and present tailored visualizations that aid us in clearly identifying new and existing systematics. We implement these techniques using data from 105 antennas in the Hydrogen Epoch of Reionization Array (HERA) as a case study. Finally, we provide a detailed algorithm for implementing these metrics as flagging tools on real data sets.

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	Anno di pubblicazione
	
				2022
			
	Settore Scientifico Disciplinare (validi fino a 24/06/2024)
	
				Settore FIS/05 - Astronomia e Astrofisica
			
	Titolo Rivista
	
				RADIO SCIENCE
			
	DOI
	
				https://dx.doi.org/10.1029/2021RS007376
			
	Parole chiave
	
				flagging; interferometry; radio cosmology; reionization; systematics
			
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