УДК 520

CALIBRATION OF SIBERIAN RADIOHELIOGRAPH ANTENNA GAINS USING REDUNDANCY Calibration of Siberian Radioheliograph antenna gains using redundancy

Опубликовано в Solar-Terrestrial Physics · Том 7, Номер 4 · Страницы 98–103 · Рубрика: Results of current research
DOI: https://doi.org/10.12737/stp-74202111
Получено: 02.07.2021 Одобрено: 28.09.2021 Опубликовано: 20.12.2021 Язык публикаций: ENG
The paper describes application of standard gain calibration using redundancy for a 48-antenna prototype of Siberian Radioheliograph. Traditionally, for calibration, the visibilities were measured only between adjacent antennas since they have the highest signal-to-noise ratio and are sufficient for phase calibration. We have shown that this limited set of visibilities did not allow using the antenna array redundancy potential and obtaining images with a high dynamic range on a permanent basis. Images without amplitude calibration contain many artifacts and require special care when analyzed. The inclusion of visibility measurement between antennas with a double step made it possible to significantly increase the accuracy of solving the system of equations for amplitudes. Images constructed using both phase and amplitude calibrations do not have visible artifacts and are more reliable.
solar radio telescope, visibility function, radio interferometer, gain calibration
Финансирование
The work was carried out partly under Government Assignment for 2021 No. 075-00374-21-00 dated December 24, 2020 "Methods and instruments of an astrophysical experiment" (unique number 0278-2021-0010, registration number TsITiS 121040600115-2); partly using funds of the Russian Science Foundation (project No. 18-12-00172)
Текст Список литературы
Текст (PDF)
Читать Скачать

1. Altyntsev A., Lesovoi S., Globa M., Gubin A., Kochanov A., Grechnev V., et al., Multiwave Siberian Radioheliograph. Solar-Terrestrial Physics. 2020, vol. 6, iss. 2, pp. 30-40. DOI:https://doi.org/10.12737/stp-62202003.

2. Cornwell T., Fomalont E.B. Self-calibration. Synthesis imaging in radio astronomy. A Collection of Lectures from the Third NRAO Synthesis Imaging Summer School. Published by the Astronomical Society of the Pacific. 1989, vol. 6, p. 185. San Francisco, 1989.

3. Grechnev V.V., Lesovoi S.V., Smolkov G.Ya., et al. The Siberian Solar Radio Telescope: the current state of the instrument, observations, and data. Solar Phys. 2003, vol. 216, iss. 1, pp. 239-272. DOI:https://doi.org/10.1023/A:1026153410061.

4. Hjellming R.M., Basart J.P. The theory of the instrument. Introduction to the NRA0 Very Large Array. Ch. 2. NRAO, 1982.

5. Högbom J.A. Aperture synthesis with a non-regular distribution of interferometer baselines. Astron. Astrophys. Suppl. 1974, vol. 15, p. 417.

6. Lesovoi S.V., Altyntsev A.T., Ivanov E.F. Gubin A.V. The multifrequency Siberian Radioheliograph. Solar Phys. 2012, vol. 280, iss. 2, pp. 651-661. DOI:https://doi.org/10.1007/s11207-012-0008-7.

7. Lesovoi S., Altyntsev A., Kochanov A., Grechnev V., Gubin A., Zhdanov D., et al. Siberian Radioheliograph: first results. Solar Terrestrial Physics. 2017, vol. 3, iss. 1, pp. 3-18. DOI:https://doi.org/10.12737/24347.

8. Liu A., Tegmark M., Morrison S., Lutomirski A., Zaldarriaga M. Precision Calibration of Radio Interferometers Using Redundant Baselines. 2010. arXiv:1001.5268. DOI:https://doi.org/10.1111/j. 1365-2966.2010.17174.x.

9. Nakajima H., Nishio M., Enome S., et al. The Nobeyama Radioheliograph. Proc. IEEE. 1994, vol. 82, iss. 5, pp. 705-713.

10. Noordam J., de Bruyn A. High dynamic range mapping of strong radio sources, with application to 3C84. Nature. 1982, vol. 299, iss. 5884, pp. 597-600. DOI:https://doi.org/10.1038/299597a0.

11. Perley R.A. High Dynamic Range Imaging. Synthesis Imaging in Radio Astronomy II, A Collection of Lectures from the Sixth NRAO/NMIMT Synthesis Imaging Summer School. ASP Conference Ser., 1999, vol. 180, pp. 275.

12. Thompson A.R., Moran J.M, Swenson G.W., Jr.. Interferometry and Synthesis in Radio Astronomy. 2nd ed. New York: Wiley, 2001. 692 p. DOI:https://doi.org/10.1002/9783527617845.

13. Wieringa M.H. An investigation of the telescope based on calibration methods ‘redundancy’ and ‘self-cal’. Experimental Astronomy. 1992, vol. 2, pp. 203-225. DOI: 10.1007/ BF00420576.

Войти или Создать
* Забыли пароль?