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Institute of Applied Astronomy RAS

CONT14 - High-Frequency Earth Rotations Variations from VLBI Observations E. Skurikhina, A.Ipatov, S. Smolentsev, S. Kurdubov, I. Gayazov, A. Diyakov, V. Olifirov
Results of data processing of CONT11 15 day campaign of continuous VLBI sessions with a network of eleven globally distributed stations in September 2011 with participation of two stations of Russian QUASAR network stations Badary and Zelenchukskaya are presented. Preliminary analysis results on EOP precision, baseline length precision are discussed. The observed intraday variations EOP are compared with a tidal model and with results of previous CONT campaigns. Troposphere parameters are compared with ones obtained with GPS technique. From Table 1 it is possible to trace the progress of the . Data available VLBI station Location D(m) Data used
Observations on the program CONT14 are a continuation of a series of previous successful campaigns of continuous observations: CONT94 (January 1994), CONT95 (August 1995), CONT96 (end of 1996), within the framework of international VLBI Service IVS-week campaign of continuous observations: held regularly every three years, it is is the fifth campaign. Comparative characteristics campaigns CONT shown in Tables 2 and 3
N scan BADARY HART5M FORTLEZA HOBART12 HOBART26 KATH12M KOKEE MATERA NYALES20 ONSALA60 TSUKUB32 WARK12M WESTFORD WETTZELL YARRA12M YEBES40M ZELENCHK Badary Radio Astronomical Observatory, Russia Hartebeesthoek Radio Astronomy Observatory, South Africa Space Radio Observatory of the Northeast (ROEN), Fortaleza, Brazil Mt. Pleasant Radio Astronomy Observatory, Hobart, TAS, Australia Mt. Pleasant Radio Astronomy Observatory, Hobart, TAS, Australia Katherine Observatory, Katherine, NT, Australia Kokee Park Geophysical Observatory, Kauai, HI, USA Centro di Geodesia Spaziale G. Colombo, Matera, Italy Ny Alesund Geodetic Observatory, Spitsbergen, Norway Onsala Space Observatory, Sweden Tsukuba VLBI Station, Japan Warkworth VLBI Station, New Zealand Westford Antenna, Haystack Observatory, MA, USA Fundamentalstation Wettzell, Germany Yarragadee Observatory, Yarragadee, WA, Australia Astronomical Center at Yebes, Spain Radioastronomical Observatory Zelenchukskaya, Russia 32 26 14.2 12 26 12 25 32 20 20 32 12 18 20 12 40 32 6337 6219 5219 6812 6887 6322 7001 6119 6999 6251 8347 5771 7117 6889 6103 6894 6567 % rec 92 100 100 98 95 97 97 96 99 99 98 100 100 96 100 99 96 Cab Cal + + + + + + + + + + T + + + + + + + + + + + + + + + + P + + + + + + + + + + + + + + + + H + + + + + ++ + + + + + + + + +

VLBI technology, because the main goal of the campaign is to demonstrate CONT maximum possible accuracy of the observations, which can provide both the VLBI technique for a two-week time frame. The main scientific goal is to continue the study of Earth's rotation with a high temporal resolution for the study of high tidal variations. Feature of the campaign schedule for CONT14, CONT11 CONT08 is the continuity of observations. If CONT02 and CONT05 had hourly intervals between sessions daily for solutions to various technical problems, for the campaign period for technical breaks for each of the stations do not overlap. Also the beginning of the sessions in 0:00:00 UT allows you to make a more valid comparison with the data obtained from the GPS / GLONASS observations..

Figure 1 CONT14 network

Table 1. CONT14 network
Registion system V registr ation Mbit/c 128 128 128 256 WVR GPS , SLR DORIS WVR(3) GPS, SLR(3) DORIS(4) WVR(5) GPS, SLR(3) DORIS(4) WVR(5) GPS, SLR(3) DORIS(5) WVR(?) GPS, SLR(5) DORIS(5) WVR(?) collocation correlator

CONT

Observation time

Statio ns numbe r 7 6 5 8

IVSCONT CONT02

Number of scans 6946 12952 17272 16430 23040 observations 49826 96437 153738 145214 287275 sources 49 74 80 114 73

All the observations were processed at the BONN correlator. Sessions corresponding to the IVS-R1 and IVS-R4 went and were correlated in emergency mode sessions. Stations HOBART26, HOBART12M, HART15M, KATH12M, NYALES20, TSUKUB32, WARK12M and YARRA12M used e-transter data to the Bonn Correlator:,. Observations of Fortleza were etransferred from WACO to BONN . Determination of the World have been conducted continuously in nearreal-time at the base ONSALA60-TSUKUB32.

CONT94 CONT95 CONT96 IVS CONT02

January 1994 August. 1995 November 1996 October 2002

Mk3 Mk3 Mk3 VLBA Mk34

WVR

Haystack WACO WACO WACO Bonn Haystack WACO Bonn Haystack WACO

CONT05 CONT08 CONT11 CONT14

Table 3. IVS CONT observation statistic As the evaluation accuracy can be used EOP average error formal definition EOP and standard deviation (SD) of several IERS C04 08 after subtracting systematic differences (Table 4)
IVS CONT

IVS CONT05 IVS CONT08 IVS CONT11 IVS CONT14

September 2005 August 2008 September 2011 May 2014

11

Mark 4

256

Secondary data processing of CONT14 observations was carried out using a OCCAM/GROSS soft. In the calculation of diurnal EOP 15 daily sessions were combined into one 15-day session (consisting of 23040 scans and 287 275 delays), which has been processed using a package OCCAM / GROSS using the forward run of the Kalman filter to estimate the stochastic parameters. As stochastic parameters are considered EOP (pole coordinates and universal time), the date, time, wet component of the tropospheric delay at the zenith (WZD). The behavior of stochastic parameters of simulated random walk process. As a priori parameters were used the following values: a priori variance for EOP - 1 mas І, a priori spectral density for EOP - 1 mas І / day. Unlike standard treatment regimen is shown in Table 5.

11

Mk5

512

Expected accuracy
Xp,Yp UT1 µs 2 1 .5 1 .3 1 .5 µas

Formal accuracy
Xp,Yp µas 53 26 24 22 UT1 µs 2 .2 1 .1 1 .1 1 .3

RMS EOP(IERS-CONT) Xp,Yp µas 84 56 42 40 UT1 µs 7 .9 4 .6 4 .1 4 .3 X,Y µas 86 102 69 69

14

Mark5A/ Mark5B Mark5B

512

WACO
CONT02 CONT05

EOP service solution (daily EOP)

60 40 35 35

Intraday EOP solution ( Xp, Yp, UT1)

17

512

BONN

CONT08 CONT11

Constant parameters: Xp, Yp, UT1, Xc, Yc Stohastic prameters: WZD, clock A-priory standart deviation of EOP: 100 mas Constant parameters: Xc, Yc Stohastic prameters: Xp, Yp, UT1, WZD, clock A-priory standart deviation of EOP: 1 mas. A-priory Power Spectral Dencity : 10 masІ/day.

CONT14

35

1.5

17.5

1.1

74

11.6

72

Table 2. CONTs specification Table 4. EOP accuracy from IVS-CONT

Table 5. Distinction these solution from EOP service solution

Fig. 2. Diurnal variation of Xp, Yp and Ut1 compared with the model of diurnal variations of EOP IERS Conventions 2003, At the time axis used the number of CONT14:days MJD --56783. RMS (Xp - model) = 188as, RMS (Yp-model) = 159 as, RMS (dUT1-model) = 18 s

Plans for the future: Analysis of diurnal variations of EOP . Data processing using the software package QUASAR with different appoaches, the comparison of results. Fig. 3. The zenith tropospheric delay (TZD - total zenith delay): VLBI data are shown in red, green ­ TZD from GPS ( USNO data center) , At the time axis used the number of CONT14:days MJD ­56783.

JOURNEES 2014 SYSTEMES DE REFERENCE SPATIO-TEMPORELS "Recent developments and prospects in ground-based and space astrometry" 22-24 September 2014 Pulkovo Observatory, St. Petersburg, Russia