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"Quasar" VLBI network observatories as co-location sites
A. Ipatov, I. Gayazov, S. Smolentsev
Institute of Applied Astronomy, Saint Petersburg, Russia

WPLTN-2012 September 24 - 28, 2012 Saint Petersburg


Collocation of Space Geodetic Techniques
· is realized in the framework of IERS · provides the most reliable results for TRF and EOP · supposes: 1. installation of different observational techniques at sites (co-location) 2. combined processing of different types of observations (collocation)


IAA activity in space geodesy
· "Quasar" VLBI network:
­ VLBI observations ­ GPS/GLONASS observations ­ DORIS (Badary) ­ SLR observations ­ Meteo-, WVR-data ­ Local ties monitoring · IAA EOP Service: ­ VLBI (IVS: 24h - weekly, Int - daily) ­ VLBI (Ru: 24h, 1h, weekly) ­ GPS (IGS, 24h, daily) ­ SLR (ILRS, 96h, daily) ­ Combination software development


IAA EOP service structure
VMware virtual machines on Sun Fire Server Internet
Server for automatic data collecting

VLBI

GPS Quasar network Server for data base SLR Sun Disk Array Service utilities


IAA activity in space geodesy
· "Quasar" VLBI network:
­ VLBI observations ­ GPS/GLONASS observations ­ DORIS (Badary) ­ SLR observations ­ Meteo-, WVR-data ­ Local ties monitoring · IAA EOP Service: ­ VLBI (IVS: 24h - weekly, Int - daily) ­ VLBI (Ru: 24h, 1h, weekly) ­ GPS (IGS, 24h, daily) ­ SLR (ILRS, 96h, daily) ­ Combination software development


VLBI Network "Quasar"


VLBI systems
Radio telescopes with 32 m antenna
Sv Zc Bd

International (IVS, EVN and domestic observation programs


Combined GNSS receivers
SVTL ZECK BADG

TOPCON NET-G3 (72 channels)

Javad Delta-G3T

Javad Delta-G3T (216 channels)

Javad Delta-G3T

Daily and Hourly submission of observational data


SLR systems "Sazhen-TM"

DORIS Antenna (Badary obs.)


· Common equipment: ­ Time synchronization system with CH1-80 fr e q u e n c y s ta n d a r d s ­ Vaisala WXT 510 meteo stations · Auxiliary equipment: ­ WVR (Svetloe observatory) ­ Equipment for local geodetic survey (GPS receivers Leica SR520, tachymeters, e tc .)


Different global and regional network stations at the "Quasar" observatories
Technique VLBI GNSS SLR DORIS Network station IVS, EVN station (year) IGS, EPN station (year) ILRS station (year) IDS station (year) "Svetloe" Sv, 7380 ( 2003) SVTL ( 2004) 1888 ( 2012) "Zelenchukskaya" Zc, 7381 ( 2005) ZECK ( 1997) 1889 ( 2012) "Badary" Bd, 7382 ( 2006) BADG (2011) 1890 ( 2012) BADB ( 1992)


Location of instruments at Svetloe observatory


Location of instruments at Zelenchukskaya o b s e r v a to r y


Location of instruments at Badary observatory


Reference points of instruments
· RT-32 ­ intersection of axis (accounting antenna r offset) L
r Li = ( N , E , H )
T

· GNSS receiver ­ antenna marker · DORIS ­ antenna marker · SLR ­ intersection of axis


Determination of RT-32 RP
1

.101



5 2 4

.107

3

.109


Determination of preliminary coordinates of the SLR system reference points
Data used: 1. Eccentricity vectors from GNSS antenna markers determined from local geodetic surveying 2. Height of the SLR system mount


NEU components of eccentricity vectors from markers of GNSS stations
Eccentricity vectors From SVTL to 1888 RP From ZECK to 1889 RP From BADG to 1890 RP N, m 32.540 ± 0.003 30.683 ± 0.002 36.585 ± 0.002 E, m -23.158 ± 0.003 25.381 ± 0.002 25.925 ± 0.002 U, m -7.634 ± 0.001 -10.856 ± 0.001 -8.085 ± 0.001


Local geodetic networks
Zelenchukskaya Badary


Consistency of VLBI- and GPS-derived coordinates with local geodetic measurements
1) Geocentric coordinates of VLBI antenna reference point 2) Geocentric coordinates of GNSS-antenna marker 3) Eccentricity vectors from local geodetic survey

r r (dN , dE , dH ) = LLGS - T( RR
T

T - 32

r - RGPS )

Differences of coordinates in ITRF2005-system for epoch 2005.0
Observatory Svetloe Zelenchukskaya Badary dN,mm 0 -2 2 dE, mm 5 - 12 - 15 dH, mm 4 -4 16


Comparing baselines (VLBI and reduced GPS) Epoch 2005.0

r r r r r r b = ( RV 1 - RV 2 - ( RG1 + T1L1 ) - ( RG 2 + T2 L2 )
T1 , T2 rr
L1 , L2
transformation matrixes - eccentricity vectors

Baseline Sv-Bd Sv-Zc Zc-Bd

b

, mm

4.8 3.2 -9.7


Thank you for your attention!