MeerKAT Holography Measurements in the UHF, L, and S Bands
Radio holographic measurements using the MeerKAT telescope are presented for each of its supported observing bands, namely UHF (544–1087 MHz), L (856–1711 MHz), and S (1750–3499 MHz). Because the UHF -band receiver design is a scaled version of that of the L band, the electromagnetic performance in...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/acabc3 |
| _version_ | 1797701481479012352 |
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| author | Mattieu S. de Villiers |
| author_facet | Mattieu S. de Villiers |
| author_sort | Mattieu S. de Villiers |
| collection | DOAJ |
| description | Radio holographic measurements using the MeerKAT telescope are presented for each of its supported observing bands, namely UHF (544–1087 MHz), L (856–1711 MHz), and S (1750–3499 MHz). Because the UHF -band receiver design is a scaled version of that of the L band, the electromagnetic performance in these two bands are expectedly similar to one another. Despite also being linearly polarized, S -band receivers have an entirely different design and distinct performance characteristics from the lower two bands. As introduced in previous work for the L band, evidence of higher order waveguide mode activation also appears in S -band measurements but there are differences in its manifestation. Frequency-dependent pointing (beam squint), beamwidth, beam ellipticity, error beam, instrumental polarization, and cross-polarization power measurements are illustrated for each of MeerKAT’s observational bands in a side-by-side style to facilitate the comparison of features. The derivation of collimation errors and main reflector surface errors from measurements made at these relatively low observation frequencies is also discussed. Results include elevation and ambient temperature effects on collimation, as well as the signatures of collimation degrading over time. The accompanying data release includes a snapshot of full Jones matrix primary beam patterns for all bands and antennas with corresponding derived metrics. |
| first_indexed | 2024-03-12T04:37:19Z |
| format | Article |
| id | doaj.art-bdf955ac2e2e4051b306fc58a977be3a |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T04:37:19Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-bdf955ac2e2e4051b306fc58a977be3a2023-09-03T09:55:17ZengIOP PublishingThe Astronomical Journal1538-38812023-01-0116537810.3847/1538-3881/acabc3MeerKAT Holography Measurements in the UHF, L, and S BandsMattieu S. de Villiers0https://orcid.org/0000-0001-5628-0417South African Radio Astronomy Observatory , 2 Fir Street, Black River Park, Observatory, 7925, RSA ; mattieu@sarao.ac.zaRadio holographic measurements using the MeerKAT telescope are presented for each of its supported observing bands, namely UHF (544–1087 MHz), L (856–1711 MHz), and S (1750–3499 MHz). Because the UHF -band receiver design is a scaled version of that of the L band, the electromagnetic performance in these two bands are expectedly similar to one another. Despite also being linearly polarized, S -band receivers have an entirely different design and distinct performance characteristics from the lower two bands. As introduced in previous work for the L band, evidence of higher order waveguide mode activation also appears in S -band measurements but there are differences in its manifestation. Frequency-dependent pointing (beam squint), beamwidth, beam ellipticity, error beam, instrumental polarization, and cross-polarization power measurements are illustrated for each of MeerKAT’s observational bands in a side-by-side style to facilitate the comparison of features. The derivation of collimation errors and main reflector surface errors from measurements made at these relatively low observation frequencies is also discussed. Results include elevation and ambient temperature effects on collimation, as well as the signatures of collimation degrading over time. The accompanying data release includes a snapshot of full Jones matrix primary beam patterns for all bands and antennas with corresponding derived metrics.https://doi.org/10.3847/1538-3881/acabc3InterferometersObservational astronomyPolarimetry |
| spellingShingle | Mattieu S. de Villiers MeerKAT Holography Measurements in the UHF, L, and S Bands The Astronomical Journal Interferometers Observational astronomy Polarimetry |
| title | MeerKAT Holography Measurements in the UHF, L, and S Bands |
| title_full | MeerKAT Holography Measurements in the UHF, L, and S Bands |
| title_fullStr | MeerKAT Holography Measurements in the UHF, L, and S Bands |
| title_full_unstemmed | MeerKAT Holography Measurements in the UHF, L, and S Bands |
| title_short | MeerKAT Holography Measurements in the UHF, L, and S Bands |
| title_sort | meerkat holography measurements in the uhf l and s bands |
| topic | Interferometers Observational astronomy Polarimetry |
| url | https://doi.org/10.3847/1538-3881/acabc3 |
| work_keys_str_mv | AT mattieusdevilliers meerkatholographymeasurementsintheuhflandsbands |