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Rail Track Level of RT-32 Antennas of the Quasar VLBI Network

Transactions of IAA RAS, issue 54, 71–74 (2020)

Keywords: rail track level of antennas, analysis of the dynamics of changes, wear resistance of structural elements, systematic error

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Abstract

The paper presents the results of measuring the rail track level of the Quasar VLBI Network radio telescopes. The three radio telescopes (RT-32) located in different astronomical observatories of IAA RAS have the main mirrors that are 32 m in diameter. The durability of the RT structural elements associated with movement in azimuth depends on the state of the rail track. In addition, in the case of an unsatisfactory state of the rail track, a systematic error has an impact on the spatial position of the RT elevation axis. It should be noted that the systematic error has different values in each position of the RT in azimuth. In this regard, the level of the RT-32 elevation axis was calculated depending on the azimuthal position in order to determine, in particular, the altitude component of this systematic error. As a result, for each RT-32 of the Quasar VLBI Network, the altitude component of the systematic error of the elevation axis position was determined. The range of its changes during the RT movement in azimuth was also obtained. The analysis shows that the level of the RT-32 rail track deteriorates over time, which reflects in the growth of such a parameter as the standard deviation of the RT rail track level. In the event of significant elevation differences in the areas of a radio telescope operation during azimuth movement, the mechanisms of azimuth movement, the rail and the base of the RT are subjected to abnormal loads, leading to premature wear

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A. O. Shamov. Rail Track Level of RT-32 Antennas of the Quasar VLBI Network // Transactions of IAA RAS. — 2020. — Issue 54. — P. 71–74.

@article{shamov2020,
  abstract = {The paper presents the results of measuring the rail track level of the Quasar VLBI Network radio telescopes. The three radio telescopes (RT-32) located in different astronomical observatories of IAA RAS have the main mirrors that are 32 m in diameter.
The durability of the RT structural elements associated with movement in azimuth depends on the state of the rail track. In addition, in the case of an unsatisfactory state of the rail track, a systematic error has an impact on the spatial position of the RT elevation axis. It should be noted that the systematic error has different values in each position of the RT in azimuth. In this regard, the level of the RT-32 elevation axis was calculated depending on the azimuthal position in order to determine, in particular, the altitude component of this systematic error. As a result, for each RT-32 of the Quasar VLBI Network, the altitude component of the systematic error of the elevation axis position was determined. The range of its changes during the RT movement in azimuth was also obtained.
The analysis shows that the level of the RT-32 rail track deteriorates over time, which reflects in the growth of such a parameter as the standard deviation of the RT rail track level. In the event of significant elevation differences in the areas of a radio telescope operation during azimuth movement, the mechanisms of azimuth movement, the rail and the base of the RT are subjected to abnormal loads, leading to premature wear},
  author = {A.~O. Shamov},
  doi = {10.32876/ApplAstron.54.71-74},
  issue = {54},
  journal = {Transactions of IAA RAS},
  keyword = {rail track level of antennas, analysis of the dynamics of changes, wear resistance of structural elements, systematic error},
  pages = {71--74},
  title = {Rail Track Level of RT-32 Antennas of the Quasar VLBI Network},
  url = {http://iaaras.ru/en/library/paper/2065/},
  year = {2020}
}

TY  - JOUR
TI  - Rail Track Level of RT-32 Antennas of the Quasar VLBI Network
AU  - Shamov, A. O.
PY  - 2020
T2  - Transactions of IAA RAS
IS  - 54
SP  - 71
AB  - The paper presents the results of measuring the rail track level of
the Quasar VLBI Network radio telescopes. The three radio telescopes
(RT-32) located in different astronomical observatories of IAA RAS
have the main mirrors that are 32 m in diameter.  The durability of
the RT structural elements associated with movement in azimuth
depends on the state of the rail track. In addition, in the case of
an unsatisfactory state of the rail track, a systematic error has an
impact on the spatial position of the RT elevation axis. It should be
noted that the systematic error has different values in each position
of the RT in azimuth. In this regard, the level of the RT-32
elevation axis was calculated depending on the azimuthal position in
order to determine, in particular, the altitude component of this
systematic error. As a result, for each RT-32 of the Quasar VLBI
Network, the altitude component of the systematic error of the
elevation axis position was determined. The range of its changes
during the RT movement in azimuth was also obtained.  The analysis
shows that the level of the RT-32 rail track deteriorates over time,
which reflects in the growth of such a parameter as the standard
deviation of the RT rail track level. In the event of significant
elevation differences in the areas of a radio telescope operation
during azimuth movement, the mechanisms of azimuth movement, the rail
and the base of the RT are subjected to abnormal loads, leading to
premature wear
DO  - 10.32876/ApplAstron.54.71-74
UR  - http://iaaras.ru/en/library/paper/2065/
ER  -