Fundamental limits of radio interferometers: calibration and source parameter estimation
We use information theory to derive fundamental limits on the capacity to calibrate next-generation radio interferometers, and measure parameters of point sources for instrument calibration, point source subtraction, and data deconvolution. We demonstrate the implications of these fundamental limits...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
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2012
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| Online Access: | http://hdl.handle.net/20.500.11937/60655 |
| _version_ | 1848760624032514048 |
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| author | Trott, Cathryn Wayth, Randall Tingay, Steven |
| author_facet | Trott, Cathryn Wayth, Randall Tingay, Steven |
| author_sort | Trott, Cathryn |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We use information theory to derive fundamental limits on the capacity to calibrate next-generation radio interferometers, and measure parameters of point sources for instrument calibration, point source subtraction, and data deconvolution. We demonstrate the implications of these fundamental limits, with particular reference to estimation of the 21cm Epoch of Reionization power spectrum with next-generation low-frequency instruments (e.g., the Murchison Widefield Array -- MWA, Precision Array for Probing the Epoch of Reionization -- PAPER), where short time scale instrumental calibration is required due to the impact of the ionosphere on the signal wavefront. Finally, we explore the optimal point source precision available by using a combination of current and prior information. Estimation schemes that incorporate prior information may be advantageous when the measurement precision is comparable to the characteristic refraction scale of the ionosphere. |
| first_indexed | 2025-11-14T10:18:44Z |
| format | Journal Article |
| id | curtin-20.500.11937-60655 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:18:44Z |
| publishDate | 2012 |
| publisher | - |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-606552018-07-17T06:58:40Z Fundamental limits of radio interferometers: calibration and source parameter estimation Trott, Cathryn Wayth, Randall Tingay, Steven We use information theory to derive fundamental limits on the capacity to calibrate next-generation radio interferometers, and measure parameters of point sources for instrument calibration, point source subtraction, and data deconvolution. We demonstrate the implications of these fundamental limits, with particular reference to estimation of the 21cm Epoch of Reionization power spectrum with next-generation low-frequency instruments (e.g., the Murchison Widefield Array -- MWA, Precision Array for Probing the Epoch of Reionization -- PAPER), where short time scale instrumental calibration is required due to the impact of the ionosphere on the signal wavefront. Finally, we explore the optimal point source precision available by using a combination of current and prior information. Estimation schemes that incorporate prior information may be advantageous when the measurement precision is comparable to the characteristic refraction scale of the ionosphere. 2012 Journal Article http://hdl.handle.net/20.500.11937/60655 10.22323/1.163.0043 http://creativecommons.org/licenses/by-nc-sa/1.0/ - fulltext |
| spellingShingle | Trott, Cathryn Wayth, Randall Tingay, Steven Fundamental limits of radio interferometers: calibration and source parameter estimation |
| title | Fundamental limits of radio interferometers: calibration and source parameter estimation |
| title_full | Fundamental limits of radio interferometers: calibration and source parameter estimation |
| title_fullStr | Fundamental limits of radio interferometers: calibration and source parameter estimation |
| title_full_unstemmed | Fundamental limits of radio interferometers: calibration and source parameter estimation |
| title_short | Fundamental limits of radio interferometers: calibration and source parameter estimation |
| title_sort | fundamental limits of radio interferometers: calibration and source parameter estimation |
| url | http://hdl.handle.net/20.500.11937/60655 |