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Geodetic Control Methods of RT-32, RT-13 Radio Telescopes Mirror Systems

Transactions of IAA RAS, issue 70, 13–18 (2024)

Keywords: mirror systems of radio telescopes contact method of measurement, step-by-step scanning method, photogrammetric method of measurement, standard deviation of the geometry of the reflecting surface of the RT, cartograms of deviations

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Abstract

The mirror systems of the RT-32 and RT-13 radio telescopes consist of two main elements: the main mirror (reflector) and the secondary mirror (subreflector). It is the quality of their execution that to some extent determines the accuracy of VLBI observational data. Thus, there is a need to carry out research on the assessment of the surface geometric parameters of the radio telescopes (RT) mirror systems, which are part of the radio astronomy observatories of the Quasar-KVO complex. While carrying out this task, various methods of geodetic control were applied as being part of the reflective surface modernization of the RT-32 subreflector, the contact method and the method of step-by-step surface scanning were utilized. Furthermore, to assess the accuracy of the reflecting RT-32 subreflector surface, a photogrammetric research method was employed, which was subsequently used in measurements of the RT-13 mirror system. As a сconsequence, the most suitable method for geodetic control of RT-32, RT-13 radio telescopes turned to be the photogrammetric method of research, which, to a great extent, seems to be due to high accuracy of the result obtained in outdoor conditions. However, it is worth noting that in the case of increasing the accuracy of reflectorless laser systems, it is the step-by-step scanning method that becomes the most suitable for performing these types of work. The control measurements showed that the RMS of the geometry of the reflecting surface of the SR RT-32 in the observatories: “Svetloe”, “Zelenchukskaya”, “Badary” proved to be 0.34, 0.38 and 0.31 mm, respectively, while the RMS of the geometry of the reflecting surface of the RT-13 in the “Svetloe” observatory are 0.19 mm for reflector, 0.18 mm for subreflector.

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A. O. Shamov. Geodetic Control Methods of RT-32, RT-13 Radio Telescopes Mirror Systems // Transactions of IAA RAS. — 2024. — Issue 70. — P. 13–18.

@article{shamov2024,
  abstract = {The mirror systems of the RT-32 and RT-13 radio telescopes consist of two main elements: the main mirror (reflector) and the secondary mirror (subreflector). It is the quality of their execution that to some extent determines the accuracy of VLBI observational data. Thus, there is a need to carry out research on the assessment of the surface geometric parameters of the radio telescopes (RT) mirror systems, which are part of the radio astronomy observatories of the Quasar-KVO complex.
While carrying out this task, various methods of geodetic control were applied as being part of the reflective surface modernization of the RT-32 subreflector, the contact method and the method of step-by-step surface scanning were utilized. Furthermore, to assess the accuracy of the reflecting RT-32 subreflector surface, a photogrammetric research method was employed, which was subsequently used in measurements of the RT-13 mirror system. 
As a сconsequence, the most suitable method for geodetic control of RT-32, RT-13 radio telescopes turned to be the photogrammetric method of research, which, to a great extent, seems to be due to high accuracy of the result obtained in outdoor conditions. However, it is worth noting that in the case of increasing the accuracy of reflectorless laser systems, it
is the step-by-step scanning method that becomes the most suitable for performing these types of work. The control measurements showed that the RMS of the geometry of the reflecting surface of the SR RT-32 in the observatories: “Svetloe”, “Zelenchukskaya”, “Badary” proved to be 0.34, 0.38 and 0.31 mm, respectively, while the RMS of the geometry of the reflecting surface of the RT-13 in the “Svetloe” observatory are 0.19 mm for reflector, 0.18 mm for subreflector.},
  author = {A.~O. Shamov},
  doi = {10.32876/ApplAstron.70.13-18},
  issue = {70},
  journal = {Transactions of IAA RAS},
  keyword = {mirror systems of radio telescopes contact method of measurement, step-by-step scanning method, photogrammetric method of measurement, standard deviation of the geometry of the reflecting surface of the RT, cartograms of deviations},
  pages = {13--18},
  title = {Geodetic Control Methods of RT-32, RT-13 Radio Telescopes Mirror Systems},
  url = {http://iaaras.ru/en/library/paper/2191/},
  year = {2024}
}

TY  - JOUR
TI  - Geodetic Control Methods of RT-32, RT-13 Radio Telescopes Mirror Systems
AU  - Shamov, A. O.
PY  - 2024
T2  - Transactions of IAA RAS
IS  - 70
SP  - 13
AB  - The mirror systems of the RT-32 and RT-13 radio telescopes consist of
two main elements: the main mirror (reflector) and the secondary
mirror (subreflector). It is the quality of their execution that to
some extent determines the accuracy of VLBI observational data. Thus,
there is a need to carry out research on the assessment of the
surface geometric parameters of the radio telescopes (RT) mirror
systems, which are part of the radio astronomy observatories of the
Quasar-KVO complex.  While carrying out this task, various methods of
geodetic control were applied as being part of the reflective surface
modernization of the RT-32 subreflector, the contact method and the
method of step-by-step surface scanning were utilized. Furthermore,
to assess the accuracy of the reflecting RT-32 subreflector surface,
a photogrammetric research method was employed, which was
subsequently used in measurements of the RT-13 mirror system.   As a
сconsequence, the most suitable method for geodetic control of RT-32,
RT-13 radio telescopes turned to be the photogrammetric method of
research, which, to a great extent, seems to be due to high accuracy
of the result obtained in outdoor conditions. However, it is worth
noting that in the case of increasing the accuracy of reflectorless
laser systems, it  is the step-by-step scanning method that becomes
the most suitable for performing these types of work. The control
measurements showed that the RMS of the geometry of the reflecting
surface of the SR RT-32 in the observatories: “Svetloe”,
“Zelenchukskaya”, “Badary” proved to be 0.34, 0.38 and 0.31 mm,
respectively, while the RMS of the geometry of the reflecting surface
of the RT-13 in the “Svetloe” observatory are 0.19 mm for reflector,
0.18 mm for subreflector.
DO  - 10.32876/ApplAstron.70.13-18
UR  - http://iaaras.ru/en/library/paper/2191/
ER  -