Pulkovo EOP and Reference Systems Analysis Center (PERSAC)

• General Information
• Products
• PUL VLBI Analysis Center
• PULK GNSS station
• Related links
• Contact

General Information

Pulkovo EOP and Reference Systems Analysis Center (PERSAC) is located at the Central Astronomical Observatory at Pulkovo of Russian Academy of Sciences (Pulkovo Observatory). Main PERSAC activities include:

• Investigation of low frequency variations in Earth rotation (polar motion, length of day, celestial pole motion).
• Processing of VLBI, GPS, SLR, and astrooptical observations aimed at analysis of the Earth rotation, station displacement, and celestial reference system.
• Support of the GNSS station PULK.

Products

• Mean Pole coordinates (with prediction).
  
  
• Celestial Pole Offset (CPO) and Free Core Nutation (FCN).
  
  Two daily updated series are available.

  File fcn1.dat contains the ZM1 FCN model with variable amplitude and phase. This model is provided for the period from 1984.0 to (current date - 1.5 yr) to obtain geophysically meaningful data without significant edge effect. The IVS combined EOP series is used for computation. The model is aimed primarily at users who are interested in geophysical interpretation of the observations.

  File fcn2.dat contains the ZM2 CPO model computed by smoothing the IVS combined EOP series with forward and backward prediction covering the period from 1976 to (last IVS EOP epoch + 2 yr). This model is aimed primarily at users who need the maximum accuracy of the CRF<->TRF transformation, including real-time applications, without bothering about theoretical background and geophysical meaning.

  If you use this data in your work, please cite the following paper
  Malkin Z. Empiric models of the Earth's free core nutation. Solar System Research, 2007, v. 41, No. 6, pp. 492-497.
  

• VLBI Intensives UT1 series in the IERS format.
  
  
• SLR ERP series in the IERS format.

Related links

• IAU:  International Astronomical Union
• IAG:  International Association of Geodesy
• IERS:  International Earth Rotation and Reference Systems Service
• IVS:  International VLBI Service for Geodesy and Astrometry
• IGS:  International GNSS Service
• ILRS:  International Laser Ranging Service
• IDS:  International DORIS Service

Contact:   Zinovy Malkin, malkin@gao.spb.ru

Pulkovo Observatory homepage

Lab of Radioastrometry and Geodynamics

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