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National Research Institute for Physical-Technical and Radio Engineering Measurements

IMPROVEMENT OF THE SOFTWARE BERNESE FOR CALCULATION OF THE EARTH ROTATION PARAMETERS ACCORDING TO THE DATA OF SATELLITE LASER RANGING (LAGEOS 1, LAGEOS 2) IN THE MAIN METROLOGICAL CENTRE OF THE STATE TIME AND FREQUENCY SERVICE Tsyba E. N., Kaufman M. B.
141570, Mendeleevo, Moscow region, Russia tel. +7-903-194-7575; tsyba_e_n@mail.ru

ABSTRACT
Preparatory works for resuming operational calculations of the Earth rotation parameters based on the results of satellite laser ranging data processing (LAGEOS 1, L AGEOS 2) are to be completed in the Main Metrology Centre Of The State Time And Frequency Service ( VN IIFTRI) in 2014. For this purpose BERNESE 5.2 software (Switzerland) was chosen as a base software which has been used for many years in the Main Metrological Centre of the State Time and Frequency Service to process phase observations of GLON ASS and GPS satellites. Although in the BERNESE 5.2 software announced presentation t he possibility of the SLR data processing is declared, it has not been fully implemented. In particular there is no such an essential element as corrective action (as input or resulting parameters) in the local time scale («time bias»), etc. Therefore, additional program blocks have been developed and integrated into the BERNESE5.2 software environment. The program blocks are written in Perl and Matlab program languages and can be used both for Windows and Linux, 32-bit and 64-bit platforms.

RESULTS
Table 1 ILRS station list

Nowadays the program is operation in experimental conditions and the first results have been obtained: in figures 3 and 4 the influence of Rb and Tb on laser satellite measurement carried out on station MDVL is shown; figures 5-6 show the declination between calculat ed pole coordinate values (xp,yp) and values of IERS service for 2013 year.

INTRODUCTION
In 2010 at VN IIFTRI a program development for SLR measurements processing was started under the supervision of leading researcher M. B. Kaufman to calculate Earth rotation parameters. The program had been developed on the base of BERNESE software. The authors of the work have developed and implemented algorithm (see
(m) -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 0.902
0.2

MJD = 56147

Fig.3
0.1 0 -0.1 -0.2

figure. 1) and calculation technique of ERP according to SLR supervisions, and also individual software elements enable to calculate and then to

include Range-bias (Rb) and Time­bias (Tb) corrections in measurements files. Also a software module was developed to provide preliminary analysis and screening of rough measurements.

0.904

0.906

0.908

0.91

0.912

0.914

0.916

0.918

0.92

M JD = 55976

Fig.4

0

-0 . 2

(m)

-0 . 4

-0 . 6

-0 . 8

-1 0.72 0 .7 4 0.76 0.78 0.8 0.82 0.84 0 .8 6

fig. 3-4 Influence of Rb and Tb on laser satellite m easurem ent (station MDVL) fig.1 Algorithm of calculation

X-pole

Fig. 5

Y-pole

Fig. 6

RESULTS
At this time ILR S Network (figure2) includes around 40 stations. The measurements of 33 are used for ER P calculation. In table 1 there is a list of stations which measurements are used for ERP calculation

fig. 4-5 Declination between calculated pole coordinate values (xp, yp) and values of IERS service

CONCLUSIONS
-The -The programme accuracy of for the Earth obtained Rotation results is Parameters close to (ERP) the one calculation of the has been developed; IERS; International Service

In order to integrate the programme into the service activity the only thing left to do is to overcome a series of fig.2 ILRS Network technical issues.