Precision calibration of radio interferometers using redundant baselines
Growing interest in 21-cm tomography has led to the design and construction of broad-band radio interferometers with low noise, moderate angular resolution, high spectral resolution and wide fields of view. With characteristics somewhat different from traditional radio instruments, these interferome...
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| Format: | Article |
| Idioma: | en_US |
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Oxford University Press on behalf of The Royal Astronomical Society
2014
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| Accés en línia: | http://hdl.handle.net/1721.1/88532 https://orcid.org/0000-0001-7670-7190 https://orcid.org/0000-0001-6876-0928 |
| _version_ | 1826208453043945472 |
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| author | Liu, Adrian Chi-Yan Tegmark, Max Erik Morrison, Scott D. Lutomirski, Andrew Michael Zaldarriaga, Matias, 1971- |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Liu, Adrian Chi-Yan Tegmark, Max Erik Morrison, Scott D. Lutomirski, Andrew Michael Zaldarriaga, Matias, 1971- |
| author_sort | Liu, Adrian Chi-Yan |
| collection | MIT |
| description | Growing interest in 21-cm tomography has led to the design and construction of broad-band radio interferometers with low noise, moderate angular resolution, high spectral resolution and wide fields of view. With characteristics somewhat different from traditional radio instruments, these interferometers may require new calibration techniques in order to reach their design sensitivities. Self-calibration or redundant calibration techniques that allow an instrument to be calibrated off complicated sky emission structures are ideal. In particular, the large number of redundant baselines possessed by these new instruments makes redundant calibration an especially attractive option. In this paper, we explore the errors and biases in existing redundant calibration schemes through simulations, and show how statistical biases can be eliminated. We also develop a general calibration formalism that includes both redundant baseline methods and basic point source calibration methods as special cases, and show how slight deviations from perfect redundancy and coplanarity can be taken into account. |
| first_indexed | 2024-09-23T14:05:54Z |
| format | Article |
| id | mit-1721.1/88532 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:05:54Z |
| publishDate | 2014 |
| publisher | Oxford University Press on behalf of The Royal Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/885322022-10-01T19:10:03Z Precision calibration of radio interferometers using redundant baselines Liu, Adrian Chi-Yan Tegmark, Max Erik Morrison, Scott D. Lutomirski, Andrew Michael Zaldarriaga, Matias, 1971- Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Liu, Adrian Chi-Yan Tegmark, Max Erik Morrison, Scott D. Lutomirski, Andrew Michael Growing interest in 21-cm tomography has led to the design and construction of broad-band radio interferometers with low noise, moderate angular resolution, high spectral resolution and wide fields of view. With characteristics somewhat different from traditional radio instruments, these interferometers may require new calibration techniques in order to reach their design sensitivities. Self-calibration or redundant calibration techniques that allow an instrument to be calibrated off complicated sky emission structures are ideal. In particular, the large number of redundant baselines possessed by these new instruments makes redundant calibration an especially attractive option. In this paper, we explore the errors and biases in existing redundant calibration schemes through simulations, and show how statistical biases can be eliminated. We also develop a general calibration formalism that includes both redundant baseline methods and basic point source calibration methods as special cases, and show how slight deviations from perfect redundancy and coplanarity can be taken into account. National Science Foundation (U.S.) (NSF grant AST-0506556) National Science Foundation (U.S.) (NSF grant AST-0907969) National Science Foundation (U.S.) (NSF grant AST-0708534) National Science Foundation (U.S.) (NSF grant AST-6920223) National Science Foundation (U.S.) (NSF grant PHY-0855425) United States. National Aeronautics and Space Administration (NASA NN-6056J406) David & Lucile Packard Foundation Research Corporation John D. and Catherine T. MacArthur Foundation 2014-08-05T13:36:02Z 2014-08-05T13:36:02Z 2010-10 2010-06 Article http://purl.org/eprint/type/JournalArticle 00358711 http://hdl.handle.net/1721.1/88532 Liu, Adrian, Max Tegmark, Scott Morrison, Andrew Lutomirski, and Matias Zaldarriaga. “Precision Calibration of Radio Interferometers Using Redundant Baselines.” Monthly Notices of the Royal Astronomical Society 408, no. 2 (July 21, 2010): 1029–1050. https://orcid.org/0000-0001-7670-7190 https://orcid.org/0000-0001-6876-0928 en_US http://dx.doi.org/10.1111/j.1365-2966.2010.17174.x Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press on behalf of The Royal Astronomical Society arXiv |
| spellingShingle | Liu, Adrian Chi-Yan Tegmark, Max Erik Morrison, Scott D. Lutomirski, Andrew Michael Zaldarriaga, Matias, 1971- Precision calibration of radio interferometers using redundant baselines |
| title | Precision calibration of radio interferometers using redundant baselines |
| title_full | Precision calibration of radio interferometers using redundant baselines |
| title_fullStr | Precision calibration of radio interferometers using redundant baselines |
| title_full_unstemmed | Precision calibration of radio interferometers using redundant baselines |
| title_short | Precision calibration of radio interferometers using redundant baselines |
| title_sort | precision calibration of radio interferometers using redundant baselines |
| url | http://hdl.handle.net/1721.1/88532 https://orcid.org/0000-0001-7670-7190 https://orcid.org/0000-0001-6876-0928 |
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