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## Current Activities of MMC SSTF in the EOP Evaluation Field

Transactions of IAA RAS, issue 57, 28–33 (2021)

Keywords: EOP, VLBI, GNSS, SLR, LLR, combination, SSTF

### Abstract

The operative Earth’s orientation parameters (EOP) evaluation activity has been carried out in the Main Metrological Center of State Service for Time, Frequency and EOP evaluation (MMC SSTF) from time of the FSUE VNIIFTRI creating (from 1954). The role of VNIIFTRI as MMC SSTF is stated by government decree №225. Besides this, VNIIFTRI participates in SSTF activity as a source of measurable data and as an Analysis Center (AC). In 2020 combined EOP values were formed by combination of nine independent EOP series which were obtained in IAA RAS, JSC TSNIIMASH and MMC SSTF. The using of IAA RAS VGOS antennas data allows significantly increased the accuracy of combined UT1 values and accuracy of UT1 prediction. The formation of operative EOP information by combination and dissemination of EOP information are provided in daily mode. Besides this, VNIIFTRI give the contribution in national and international databases by the transfer of GNSS and SLR data of observations which are carried out in VNIIFTRI and its branches located in Novosibirsk, Irkutsk, Khabarovsk and Petropavlovsk-Kamchatsky. The processing of geodetic technics (GNSS, SLR and VLBI) observations data is providing in MMC SSTF in daily mode for EOP evaluation purpose. A number of pilot activities are under way to improve methods and tools for processing and analyzing measurement data of various types is carried out in MMC SSTF. The evaluation of orbits and corrections of spacecraft clocks, as well as the processing of satellite altimetric measurements are also carried out. The work on the EOP evaluation is carried out at a high scientific and technical level. In order to improve accuracy and efficiency of EOP evaluation, work is planned both to improve methods and tools for processing and analyzing measurement data, and to improve the equipment of measuring sites. In general, the paper is for informational purposes and is written to overview the works carried out in 2020s and early 2021 at the MMC SSTF in terms of determining the EOP.

### Citation

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S. L. Pasynok, I. V. Bezmenov, I. Yu. Ignatenko, V. S. Ivanov, E. N. Tsyba, V. E. Zharov. Current Activities of MMC SSTF in the EOP Evaluation Field // Transactions of IAA RAS. — 2021. — Issue 57. — P. 28–33. @article{pasynok2021, abstract = {The operative Earth’s orientation parameters (EOP) evaluation activity has been carried out in the Main Metrological Center of State Service for Time, Frequency and EOP evaluation (MMC SSTF) from time of the FSUE VNIIFTRI creating (from 1954). The role of VNIIFTRI as MMC SSTF is stated by government decree №225. Besides this, VNIIFTRI participates in SSTF activity as a source of measurable data and as an Analysis Center (AC). In 2020 combined EOP values were formed by combination of nine independent EOP series which were obtained in IAA RAS, JSC TSNIIMASH and MMC SSTF. The using of IAA RAS VGOS antennas data allows significantly increased the accuracy of combined UT1 values and accuracy of UT1 prediction. The formation of operative EOP information by combination and dissemination of EOP information are provided in daily mode. Besides this, VNIIFTRI give the contribution in national and international databases by the transfer of GNSS and SLR data of observations which are carried out in VNIIFTRI and its branches located in Novosibirsk, Irkutsk, Khabarovsk and Petropavlovsk-Kamchatsky. The processing of geodetic technics (GNSS, SLR and VLBI) observations data is providing in MMC SSTF in daily mode for EOP evaluation purpose. A number of pilot activities are under way to improve methods and tools for processing and analyzing measurement data of various types is carried out in MMC SSTF. The evaluation of orbits and corrections of spacecraft clocks, as well as the processing of satellite altimetric measurements are also carried out. The work on the EOP evaluation is carried out at a high scientific and technical level. In order to improve accuracy and efficiency of EOP evaluation, work is planned both to improve methods and tools for processing and analyzing measurement data, and to improve the equipment of measuring sites. In general, the paper is for informational purposes and is written to overview the works carried out in 2020s and early 2021 at the MMC SSTF in terms of determining the EOP.}, author = {S.~L. Pasynok and I.~V. Bezmenov and I.~Yu. Ignatenko and V.~S. Ivanov and E.~N. Tsyba and V.~E. Zharov}, doi = {10.32876/ApplAstron.57.28-33}, issue = {57}, journal = {Transactions of IAA RAS}, keyword = {EOP, VLBI, GNSS, SLR, LLR, combination, SSTF}, pages = {28--33}, title = {Current Activities of MMC SSTF in the EOP Evaluation Field}, url = {http://iaaras.ru/en/library/paper/2088/}, year = {2021} } TY - JOUR TI - Current Activities of MMC SSTF in the EOP Evaluation Field AU - Pasynok, S. L. AU - Bezmenov, I. V. AU - Ignatenko, I. Yu. AU - Ivanov, V. S. AU - Tsyba, E. N. AU - Zharov, V. E. PY - 2021 T2 - Transactions of IAA RAS IS - 57 SP - 28 AB - The operative Earth’s orientation parameters (EOP) evaluation activity has been carried out in the Main Metrological Center of State Service for Time, Frequency and EOP evaluation (MMC SSTF) from time of the FSUE VNIIFTRI creating (from 1954). The role of VNIIFTRI as MMC SSTF is stated by government decree №225. Besides this, VNIIFTRI participates in SSTF activity as a source of measurable data and as an Analysis Center (AC). In 2020 combined EOP values were formed by combination of nine independent EOP series which were obtained in IAA RAS, JSC TSNIIMASH and MMC SSTF. The using of IAA RAS VGOS antennas data allows significantly increased the accuracy of combined UT1 values and accuracy of UT1 prediction. The formation of operative EOP information by combination and dissemination of EOP information are provided in daily mode. Besides this, VNIIFTRI give the contribution in national and international databases by the transfer of GNSS and SLR data of observations which are carried out in VNIIFTRI and its branches located in Novosibirsk, Irkutsk, Khabarovsk and Petropavlovsk-Kamchatsky. The processing of geodetic technics (GNSS, SLR and VLBI) observations data is providing in MMC SSTF in daily mode for EOP evaluation purpose. A number of pilot activities are under way to improve methods and tools for processing and analyzing measurement data of various types is carried out in MMC SSTF. The evaluation of orbits and corrections of spacecraft clocks, as well as the processing of satellite altimetric measurements are also carried out. The work on the EOP evaluation is carried out at a high scientific and technical level. In order to improve accuracy and efficiency of EOP evaluation, work is planned both to improve methods and tools for processing and analyzing measurement data, and to improve the equipment of measuring sites. In general, the paper is for informational purposes and is written to overview the works carried out in 2020s and early 2021 at the MMC SSTF in terms of determining the EOP. DO - 10.32876/ApplAstron.57.28-33 UR - http://iaaras.ru/en/library/paper/2088/ ER -