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MAIN METROLOGICAL CENTER RUSSIAN FEDERATION National Research Institute for Physical-Technical and Radio Engineering Measurements (VNIIFTRI)

e ­ mail: pasynok@vniiftri.ru, ru bezmenov@vniiftri.ru

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VNIIFTRI as the Russian Main Metrological Center of Time, Frequencies and Earth Rotation Service th ti carried out the rapid EOP processing based on GNSS, VLBI and SLR observations for many years.

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VNIIFTRI takes participation in GNSS and SLR observations of IGS and ILRS too. The EOP activities at VNIIFTRI can be grouped in four basic topics:
1) 2) 3) 4) Processing GNSS, SLR and VLBI observation data for EOP evaluation; Combination of EOP series for evaluation of reference EOP values; Combination of GLONASS satellites orbit/clock; Providing GNSS and SLR observations at five metrological sites acting under the auspices of Federal Agency on Technical Regulating of Metrology(ROSSTANDART).

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1) Processing GNSS, SLR and VLBI observation data for EOP evaluation

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Processing of measurements by phase GPS in VNIIFTRI has been started in 1999. Today EOP from GPS are obtained by processing of measurements on a from GPS by processing Russian network, which includes approximately 35 GNSS receivers of the various organizations and departments(RSA , RAS, ROSSTANDART and others) . Processing is carried out with the help of a program package BERNESE 5.0 (IAUB). From 2004 EOP evaluations from VLBI technique are carried out with the help of software package version 5.0, specially adapted to the rapid service mode. In 2011 we began to process of new series of VLBI data using VieVS software developed at the Institute of Geodesy and Geophysics (IGG), Vienna at the of Geodesy Geophysics (IGG), ienna University of Technology. Now VLBI observations are processed in VNIIFTRI with the help of and VieVs package.

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Using of SLR observations of the Lageos-1 and Lageos-2has been started in ti th 2h 1995. Processing was carried out with the help of a program package ITALAS (IAA). But the facilities and ideas which were realized in this program many years ago are not allowed to evaluate EOP with accuracy what is required now. So, using of this program for EOP evaluation in VNIIFTRI were stopped. The preparation for renewal of regular operative calculations of EOP based on results of SLR measurements is conducted. As a base software product the BERNESE 5.2 is chosen. The additional blocks considering features of laser observations and program are developed by E. Tsyba and M. Kaufman and presentation one can see on the poster: one see 4.14. Tsyba E., Kaufman M. Improvement of the software Bernese for calculation of the calculation of the Earth rotation parameters according to the data of satellite rotation according to the of satellite laser ranging (Lageos 1, Lageos 2) in the Main Metrological Centre of the State Time and Frequency Service (Poster, Journees 2014)

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Differences between EOP evaluated by the this program and EOPC04 series are this program EOPC04 series are shown at the picture

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2) Rapid combination of EOP series for evaluation of reference EOP values Rapid combination of EOP for evaluation of reference EOP values has been started in VNIIFTRI at 1955. at

D.U. Belocerkovskii - first head of EOP laboratory VNIIFTRI

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M.B. Kaufman 14.02.1938-20.04.2014

The form of bulletins and processing methods were changing in process of development of new methods of measurements and improvement of technics. D.U. Belocerkovskii D. Yu. and Kaufman M. B. were that kii th scientists who were leading this work in VNIIFTRI.

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1976
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1985

2011


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Now the 8 independent series are used for EOP combination

Analysis centers of Russian EOP PC
1 2 3 4 5 6 7 8 MMC NSTF (VNIIFTRI) MMC NSTF (VNIIFTRI) IAA RAS IAA RAS IAA RAS SVOEVP (from 1.07.13) MCC RSA IAC RSA

Observation technics
GPS VLBI SLR GPS VLBI GPS/GLONASS SLR G PS

Values
X, Y, UT1 X, Y, UT1, dy, de X, Y, UT1 X, Y, UT1 UT1 X, Y, UT1, d, d X, Y, UT1 X, Y X, Y

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It is used method of combination which was developed and implemented by Kaufman which developed and by Kaufman Mark Borisovich in 2006

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Points of the observations Russian VLBI network KVASAR KVO Russian GPS/GLONASS receivers net (RAS, ROSSTANDARD, ROSREESTR & others) Russian SLR station

Russian Centers of data processing and analysis (IAA RAS, IAC GLONASS,VIIFTRI) forms the it's own raws of EOP for VLBI, GNSS and SLR Rapid EOP combined values are formed in bulletins which accessible via ftpserver (ftp.vniiftri.ru). ru)

Rapid combination solutions in MMC RTE (VNIIFTRI)

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3) Combination of GLONASS satellites orbit/clock

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An algorithm and a program for GLONASS satellites orbits combination were developed. The calculations by this program as well as calculations of the coordinate differences for GNSS antennas in VNIIFTRI (Mendeleevo, Moscow reg.) and the North-Eastern branch of VNIIFTRI (Irkutsk) using different orbits and clock corrections are provided. Some theoretical estimates for RMS in satellites coordinate reference values determination were derived. It is shown that under condition when RMSs in satellite coordinates estimation provided by separate Analytic Centers during a long time interval are commensurable the ti bl th RMS of reference values is no greater than RMS of satellite coordinates estimated by any of the Analytic Centers. 4.1 41. Bezmenov I., Pasynok S. GLONASS GLONASS orbit/clock combination in VNIIFTRI (Poster session, Journees 2014 )

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4) Providing GNSS and SLR observations at five metrological sites acting under the auspices of Federal Agency on Technical Regulating of Metrology(ROSSTANDART).

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The results of GNSS observations are accumulated in VNIIFTRI in hourly mode and are used for used rapid EOP evaluation. .

The direct results of SLR observations are transferred into transferr IAC RSA and further in ILRS.


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