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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8663
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dc.contributor.authorAgrawal, Yash-
dc.contributor.authorSingh, Saurabh-
dc.contributor.authorGirish, B S-
dc.contributor.authorSomashekar, R-
dc.contributor.authorSrivani, K S-
dc.contributor.authorRaghunathan, A-
dc.contributor.authorPandharpure, Vishakha S-
dc.contributor.authorShankar, Udaya N-
dc.contributor.authorKeerthipriya, S-
dc.contributor.authorRao, Mayuri Sathyanarayana-
dc.date.accessioned2026-02-12T10:11:53Z-
dc.date.available2026-02-12T10:11:53Z-
dc.date.issued2025-10-29-
dc.identifier.citationExperimental Astronomy, 2025, Vol. 60, AR No.22en_US
dc.identifier.issn1572-9508-
dc.identifier.urihttp://hdl.handle.net/2289/8663-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractRadio Frequency Interference (RFI) presents a significant challenge for carrying out precision measurements in radio astronomy. In particular, RFI can be a showstopper when looking for faint cosmological signals such as the red-shifted 21-cm line from cosmic dawn (CD) and epoch of reionization (EoR). As wireless communications, satellite transmissions, and other RF technologies proliferate globally, understanding the RFI landscape has become essential for site selection and data integrity. We present findings from RFI surveys conducted at four distinct locations: three locations in India, the Gauribidanur Radio Observatory in Karnataka, Twin Lakes in Ladakh, Kalpong Dam in the Andaman Islands, and the Gruvebadet Atmosphere Laboratory in Ny-Ålesund, Svalbard, Norway. These sites, selected based on their geographical diversity and varying levels of human activity, were studied to assess RFI presence in 30-300 MHz bands, critical for low-frequency observations and experiments targeting the 21-cm CD/EoR signal. Using an automated RFI detection approach via the Hampel filter and singular value decomposition, the surveys identified both persistent and transient interference, which varies with location and time. The results provide a comprehensive view of the RFI environment at each site, informing the feasibility of long-term cosmological observations and aiding in the mitigation of RFI in radio astronomical data. The methods developed to characterize RFI can be easily generalized to any location and experiment.en_US
dc.language.isoenen_US
dc.publisherExperimental Astronomyen_US
dc.relation.urihttps://doi.org/10.48550/arXiv.2504.09125en_US
dc.relation.urihttps://doi.org/10.1007/s10686-025-10036-6en_US
dc.rights2025 The Author(sen_US
dc.subjectAstronomical Instrumentationen_US
dc.subjectObservational Cosmologyen_US
dc.subjectReionizationen_US
dc.subjectFirst starsen_US
dc.titleA multi-site study of radio environment for cosmology experimentsen_US
dc.typeArticleen_US
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