The method for RT-32 radio telescope error matrix construction in automatic mode. Automatic assesment of tracking errors

Abstract

On March 15th, 2021, scientists of the National Space Facilities Control and Tests Center and the Radio Astronomical Institute of the National Academy of Sciences of Ukraine carried out preliminary observations with the Ukrainian new generation radio telescope RT-32 (Zolochiv, Lviv region). The extragalactic radiation of radio galaxy 3C84 (Perseus-A), masers from the galactic molecular cloud W3, radio emission of methanol maser from the galactic radio source G188.946 + 0.886 were observed and successfully recorded. Observations were performed as training in the framework of preparation for the launch of a joint Ukrainian-Latvian radio astronomy project lzp-2020/2-0121. The results of the observations confirmed the world level of RT-32 radio telescope characteristics, the efficiency of the primary error matrix and revealed several shortcomings in the functioning of the tracking system. It was found that the primary tracking error matrix has insufficient discreteness and contains errors of the first and second types. In the article, we present a method of automatic construction of the radio telescope error matrix according to the data of a radiometric receiver and receivers-recorders. The method of construction provides automatic processing of the obtained radiometric data. The results of verification of the developed method using the reference radio sources of different types and the elements of tracking errors’ matrix by the elevation and azimuth obtained when using it are presented. The results obtained with the proposed method were included in the radio telescope control system and allowed us to increase the aiming accuracy of the RT-32 radio telescope.

Radio properties of the low-redshift isolated galaxies with active nuclei

“…Òàêîae áëèçüê³ äaeåðåëà ìîaeíà ñïîñòåð³ãàòè ç á³ëüø âèñîêîþ ë³í³éíîþ ðîç ä³ëüíîþ çäàò í³ñòþ òà ÷óòëèâ³ñòþ, í³ae äàëåê³, ùî äîçâîëÿº äåòàëüí³øå ïîð³âíÿòè ïàðàìåòðè ¿õíüîãî âèïðîì³íþâàííÿ ç ô³çè÷íèìè ìîäåëÿìè äaeåðåë åíåð㳿. Îòðèìàííÿ òàêèõ äàíèõ ìîaeíà îðãàí³çóâàòè çà ïðîãðà ìîþ ñïîñòåðåaeåíü íà ðàä³îòåëåñêîïàõ òèïó ÐÒ-32 â Óêðà¿í³ [6,70,71,81] (ÍÖÓÂÊÇ, ì. Çîëî÷³â, Ëüâ³âñüêà îáëàñòü, Óêðà¿íà) òà íà ³íøèõ ðàä³îòåëåñêîïàõ ñâ³òó, âêëþ÷íî äëÿ ³çîëüîâàíèõ Àßà ï³âäåííîãî íåáà, ÿê ³ ìåòîäàìè ðàä³î³íòåðôåðîìåòð³¿, çîêðåìà ìåðåae³ EVN (Eu ro pean VLBI Net work) [83]. Îòðèìàí³ ðåçóëüòàòè ñïîñòåðåaeåíü ìàòè ìóòü óí³êàëüíó íàóêîâó ö³íí³ñòü, îñê³ëüêè äëÿ â³ä³áðàíèõ íàìè ³çîëüî âàíèõ Àßà àêòèâ í³ñòü â ¿õí³õ ÿäðàõ ó âèïàäêó ¿¿ âèÿâëåííÿ ìîaeíà áóëî á ïîâ'ÿçóâàòè ëèøå ç âíóòð³øí³ìè ïðîöåñàìè â ãàëàêòèö³ òà íå âðàõîâó âàòè âïëèâ îòî÷åííÿ, ÿê äëÿ ³íøèõ ÀßÃ.…”

“…Íåäîë³êîì öüî ãî ðåaeèìó º íåìîaeëèâ³ñòü ñåëåêö³¿ ðàä³îçàâàä â³ä êîðèñíîãî ñèãíàëó. Öå íå äຠçìîãè î÷èùóâàòè çàðåºñòðîâàí³ ñèãíàëè â³ä çàâàä, àëå, ÿê ïî êàçó þòü ïîïåðåäí³ âèì³ðþâàííÿ, éìîâ³ðí³ñòü íàÿâíîñò³ ³íòåíñèâ íèõ ðà -ä³î çà âàä íà ÷àñòîò³ ñïîñòåðåaeåíü 5 ÃÃö ïðè êóòàõ ì³ñöÿ âèùå 20° ó ì³ñö³ ðîçòàøóâàííÿ ÐÒ-32 äîâîë³ ìàëà [6,70,71,81].…”