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Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques
Dissertation (MSc (Physics))--University of Pretoria, 2025.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2025
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| _version_ | 1867613490619875328 |
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| access_status_str | Open Access |
| author2 | Radcliffe, Jack F. |
| author_browse | Radcliffe, Jack F. |
| author_facet | Radcliffe, Jack F. |
| collection | Thesis |
| dc_rights_str_mv | © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Physics))--University of Pretoria, 2025. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/103003 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:36:58.812Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/103003 Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques Radcliffe, Jack F. ll3w3llyncoetzer@gmail.com Coetzer, Llewellyn Victor UCTD Instrumentation: interferometers Methods: analytical Methods: numerical Techniques: interferometric Dissertation (MSc (Physics))--University of Pretoria, 2025. Very long baseline interferometry (VLBI) is a vital tool in astronomy that unlocks extremely high resolutions with high sensitivity. The fields of view (FoVs) of VLBI observations historically were limited by bandwidth and time smearing, as well as signal attenuation experienced by the array elements due to their primary beams. Technological upgrades and improved correlation and calibration techniques have largely eliminated smearing, leaving the primary beams as the last major FoV restriction. In this thesis, we derive primary beam models for a large subset of antennas in the European VLBI Network (EVN) and enhanced Multi-Element Radio Linked Interferometer Network (e-MERLIN) using an observation scheme similar to out-of-focus holography (OOF). These models are also applied to a wide-field observation of the Hubble Deep Field-North (HDFN) to test their efficacy in removing beam-related attenuation. Obtaining accurate primary beam models of the antennas in VLBI networks would allow for wide-field observations’ development to accelerate and unlock many new facets of science, including active galactic nuclei (AGN) surveys, AGN feedback studies, gravitational lens surveys, and interstellar medium density studies, to only mention a few. In this project, we also face the additional challenge of modelling heterogeneous arrays, meaning that different primary beams are present in the data. Physics MSc (Physics) Unrestricted Faculty of Natural and Agricultural Sciences 2025-06-25T14:39:04Z 2025-06-25T14:39:04Z 2025-09 2025-05 Dissertation * S2025 http://hdl.handle.net/2263/103003 DOI: https://doi.org/10.25403/UPresearchdata.29120099.v1 https://doi.org/10.25403/UPresearchdata.29120099 en © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Instrumentation: interferometers Methods: analytical Methods: numerical Techniques: interferometric Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques |
| title | Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques |
| title_full | Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques |
| title_fullStr | Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques |
| title_full_unstemmed | Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques |
| title_short | Widening the field-of-view of Very Long Baseline Interferometric surveys through advanced calibration techniques |
| title_sort | widening the field of view of very long baseline interferometric surveys through advanced calibration techniques |
| topic | UCTD Instrumentation: interferometers Methods: analytical Methods: numerical Techniques: interferometric |
| url | http://hdl.handle.net/2263/103003 https://doi.org/10.25403/UPresearchdata.29120099 |