Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope
Dynamic spectra characterize the distribution of the total power of the received signal over time and frequency. They are widely used in radio astronomy in analysis of observations. The paper describes a method that expands capabilities of such a time-frequency analysis via utilization of the phase...
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| Дата: | 2012 |
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| Формат: | Стаття |
| Мова: | rus |
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Видавничий дім «Академперіодика»
2012
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| Онлайн доступ: | http://rpra-journal.org.ua/index.php/ra/article/view/418 |
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| Назва журналу: | Radio physics and radio astronomy |
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oai:ri.kharkov.ua:article-4182013-02-07T22:01:28Z Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope Использование фазовых динамических кросс-спектров для широкополосных радиоастрономических наблюдений: опыт применения на радиотелескопе УТР-2 Koliadin, V. L. Dynamic spectra characterize the distribution of the total power of the received signal over time and frequency. They are widely used in radio astronomy in analysis of observations. The paper describes a method that expands capabilities of such a time-frequency analysis via utilization of the phase difference between signals from two subantennas which are formed within the entire radio telescope antenna system. Phase dynamic spectra – the phase of the cross-spectrum of two signals as function of time and frequency – are formed by interferometric processing. Then, they are used for analysis together with the traditional dynamic spectra of power. This technique was implemented at the UTR-2 radio telescope. It has been used there for several years for visual detection of radio emission, for recognition of the interfering signals arriving from the antenna side lobes, as well as for differentiation of radio bursts observed within the main beam. If two pairs of antennas with noncollinear baselines are available, then the direction of arrival can be measured at each point of the time–frequency domain from the two phase dymamic spectra. The efficiency of this technique is illustrated by its application to qualitatively different types of sporadic radio emisson – namely, the emission of the Sun, Saturn, and flare stars. В радиоастрономии при обработке результатов наблюдений широко используют динамические спектры, которые характеризуют распределение суммарной мощности принимаемого излучения по времени и частоте. В статье описана методика обработки наблюдений, которая расширяет возможности такого частотно-временного анализа за счет привлечения информации о разности фаз между сигналами субантенн, сформированных в пределах антенной системы радиотелескопа. Фазовые динамические спектры – зависимость фазы взаимного спектра двух сигналов от времени и частоты – формируют путем интерферометрической обработки и затем используют совместно с традиционными динамическими спектрами мощности. Такая методика реализована на радиотелескопе УТР-2, где используется на протяжении нескольких лет для визуального обнаружения излучения, отбраковки мешающих сигналов, принимаемых по боковым лепесткам, а также для различения источников всплесков, наблюдаемых в пределах главного луча. Наличие двух пар антенн с неколлинеарными базами позволяет определять направления прихода излучения в каждой точке плоскости время–частота. Возможности методики применительно к различным типам излучения проиллюстрированы примерами обработки данных наблюдений Солнца, Сатурна и вспыхивающих звезд. Видавничий дім «Академперіодика» 2012-11-04 Article Article application/pdf http://rpra-journal.org.ua/index.php/ra/article/view/418 РАДИОФИЗИКА И РАДИОАСТРОНОМИЯ; Vol 16, No 4 (2011); 341 RADIO PHYSICS AND RADIO ASTRONOMY; Vol 16, No 4 (2011); 341 РАДІОФІЗИКА І РАДІОАСТРОНОМІЯ; Vol 16, No 4 (2011); 341 2415-7007 1027-9636 rus http://rpra-journal.org.ua/index.php/ra/article/view/418/292 |
| institution |
Radio physics and radio astronomy |
| collection |
OJS |
| language |
rus |
| format |
Article |
| author |
Koliadin, V. L. |
| spellingShingle |
Koliadin, V. L. Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope |
| author_facet |
Koliadin, V. L. |
| author_sort |
Koliadin, V. L. |
| title |
Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope |
| title_short |
Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope |
| title_full |
Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope |
| title_fullStr |
Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope |
| title_full_unstemmed |
Using Phase Dynamic Cross-Spectra for Wideband Radio Astronomy Observations: Experience from the UTR-2 Radio Telescope |
| title_sort |
using phase dynamic cross-spectra for wideband radio astronomy observations: experience from the utr-2 radio telescope |
| title_alt |
Использование фазовых динамических кросс-спектров для широкополосных радиоастрономических наблюдений: опыт применения на радиотелескопе УТР-2 |
| description |
Dynamic spectra characterize the distribution of the total power of the received signal over time and frequency. They are widely used in radio astronomy in analysis of observations. The paper describes a method that expands capabilities of such a time-frequency analysis via utilization of the phase difference between signals from two subantennas which are formed within the entire radio telescope antenna system. Phase dynamic spectra – the phase of the cross-spectrum of two signals as function of time and frequency – are formed by interferometric processing. Then, they are used for analysis together with the traditional dynamic spectra of power. This technique was implemented at the UTR-2 radio telescope. It has been used there for several years for visual detection of radio emission, for recognition of the interfering signals arriving from the antenna side lobes, as well as for differentiation of radio bursts observed within the main beam. If two pairs of antennas with noncollinear baselines are available, then the direction of arrival can be measured at each point of the time–frequency domain from the two phase dymamic spectra. The efficiency of this technique is illustrated by its application to qualitatively different types of sporadic radio emisson – namely, the emission of the Sun, Saturn, and flare stars. |
| publisher |
Видавничий дім «Академперіодика» |
| publishDate |
2012 |
| url |
http://rpra-journal.org.ua/index.php/ra/article/view/418 |
| work_keys_str_mv |
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| first_indexed |
2024-05-26T06:32:52Z |
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2024-05-26T06:32:52Z |
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