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Laser Location for the EOP Purposes in Irkutsk

V. A. Emelyanov, A. A. Lukovnikova, G. I. Modestova, S. L. Pasynok

Transactions of IAA RAS, issue 75, 21–25 (2025)

Keywords: laser rangefinder, Earth rotation parameters, spacecraft

Abstract

Since 2013, the small-sized modular quantum-optical system (MMKOS) «Sazhen-TM» has been introduced and is successfully operated at the East Siberian branch of the Federal State Unitary Enterprise «VNIIFTRI» for the purpose of determining Earth’s rotation parameters. The observation process features are described, including the exclusion of near-zenith regions due to rapid changes in mis-match corrections, limitations on observations at low elevation angles resulting from strong signal absorption in the atmosphere, and variations in observation intensity caused by poor transparency and high humidity levels. Additionally, observations from the northwestern part of the celestial hemisphere are excluded due to interference caused by urban area conditions. It is noted that the satellite observation program is developed considering these factors. A review of the software and mathematical support used is provided. The prevalence of satellite observations during daytime and the transition of the station, along with other global network stations, to updated formats of forecast files (CPF) and output CRD files is highlighted. The main results from the «Sazhen-TM» MMKOS observations at the Irkutsk station are presented, including the station’s operational duration, the composition of observed satellites used for the operational calculation of Earth Orientation Parameters (EOP) at the EOP department of the MMC SSTF (Main Metrological Center of the State Service for Time, Frequency, and EOP Evaluation) FSUE «VNIIFTRI», and the contribution of the Irkutsk station to the Russian segment of the laser observation network. An analysis of the Irkutsk laser observation station as part of the Russian segment of the network is conducted for 2024.

Citation

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V. A. Emelyanov, A. A. Lukovnikova, G. I. Modestova, S. L. Pasynok. Laser Location for the EOP Purposes in Irkutsk // Transactions of IAA RAS. — 2025. — Issue 75. — P. 21–25.

@article{emelyanov2025,
  abstract = {Since 2013, the small-sized modular quantum-optical system (MMKOS) «Sazhen-TM» has been introduced and is successfully operated at the East Siberian branch of the Federal State Unitary Enterprise «VNIIFTRI» for the purpose of determining Earth’s rotation parameters.
The observation process features are described, including the exclusion of near-zenith regions due to rapid changes in mis-match corrections, limitations on observations at low elevation angles resulting from strong signal absorption in the atmosphere, and variations in observation intensity caused by poor transparency and high humidity levels. Additionally, observations from the northwestern part of the celestial hemisphere are excluded due to interference caused by urban area conditions. It is noted that the satellite observation program is developed considering these factors. 
A review of the software and mathematical support used is provided. The prevalence of satellite observations during daytime and the transition of the station, along with other global network stations, to updated formats of forecast files (CPF) and output CRD files is highlighted. 
The main results from the «Sazhen-TM» MMKOS observations at the Irkutsk station are presented, including the station’s operational duration, the composition of observed satellites used for the operational calculation of Earth Orientation Parameters (EOP) at the EOP department of the MMC SSTF (Main Metrological Center of the State Service for Time, Frequency, and EOP Evaluation) FSUE «VNIIFTRI», and the contribution of the Irkutsk station to the Russian segment of the laser observation network. An analysis of the Irkutsk laser observation station as part of the Russian segment of the network is conducted for 2024.},
  author = {V.~A. Emelyanov and A.~A. Lukovnikova and G.~I. Modestova and S.~L. Pasynok},
  doi = {10.32876/ApplAstron.75.21-25},
  issue = {75},
  journal = {Transactions of IAA RAS},
  keyword = {laser rangefinder, Earth rotation parameters, spacecraft},
  pages = {21--25},
  title = {Laser Location for the EOP Purposes in Irkutsk},
  url = {http://iaaras.ru/en/library/paper/2226/},
  year = {2025}
}

TY  - JOUR
TI  - Laser Location for the EOP Purposes in Irkutsk
AU  - Emelyanov, V. A.
AU  - Lukovnikova, A. A.
AU  - Modestova, G. I.
AU  - Pasynok, S. L.
PY  - 2025
T2  - Transactions of IAA RAS
IS  - 75
SP  - 21
AB  - Since 2013, the small-sized modular quantum-optical system (MMKOS)
«Sazhen-TM» has been introduced and is successfully operated at the
East Siberian branch of the Federal State Unitary Enterprise
«VNIIFTRI» for the purpose of determining Earth’s rotation
parameters.  The observation process features are described,
including the exclusion of near-zenith regions due to rapid changes
in mis-match corrections, limitations on observations at low
elevation angles resulting from strong signal absorption in the
atmosphere, and variations in observation intensity caused by poor
transparency and high humidity levels. Additionally, observations
from the northwestern part of the celestial hemisphere are excluded
due to interference caused by urban area conditions. It is noted that
the satellite observation program is developed considering these
factors.   A review of the software and mathematical support used is
provided. The prevalence of satellite observations during daytime and
the transition of the station, along with other global network
stations, to updated formats of forecast files (CPF) and output CRD
files is highlighted.   The main results from the «Sazhen-TM» MMKOS
observations at the Irkutsk station are presented, including the
station’s operational duration, the composition of observed
satellites used for the operational calculation of Earth Orientation
Parameters (EOP) at the EOP department of the MMC SSTF (Main
Metrological Center of the State Service for Time, Frequency, and EOP
Evaluation) FSUE «VNIIFTRI», and the contribution of the Irkutsk
station to the Russian segment of the laser observation network. An
analysis of the Irkutsk laser observation station as part of the
Russian segment of the network is conducted for 2024.
DO  - 10.32876/ApplAstron.75.21-25
UR  - http://iaaras.ru/en/library/paper/2226/
ER  -