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Current IAA RAS activities in space geodesy

Current IAA RAS activities in space geodesy. A. Ipatov, I. Gayazov, S. Smolentsev, Yu. Bondarenko I. Rahimov , A. Diyakov , V. Shpilevsky. Activity. “Quasar” VLBI network: VLBI observations GPS/GLONASS observations; DORIS (Badary ); SLR observations; Meteo -, WVR-data;

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Current IAA RAS activities in space geodesy

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  1. Current IAA RAS activities in space geodesy A. Ipatov, I. Gayazov, S. Smolentsev, Yu. Bondarenko I. Rahimov, A. Diyakov, V. Shpilevsky

  2. Activity “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.

  3. Global and regional network stations at “Quasar” observatories

  4. VLBI observations in 2012

  5. The accuracy of EOP (Ru-E & Ru-U compared with IERS 08 C04)

  6. SLR observations • The regular software of SLR system developed by the producer is used for preparing the observation sessions and their implementation • The observational data from all stations in the initial format are collected at the Institute (IAA RAS) • The special software has been developed for pre-analysis and reduction of observational data Lageos 1 (BADL, 07-04-2012)

  7. Statistics of observations (01.01.12 - 08.15.12)

  8. Number of observations (satellite passes) in IAA stations

  9. Activity Main features: • Statistical analysis of raw data; • Forming Normal Points according to ILRS recommendations; • Output normal point data in CSTG and CRD formats; • Full automation of data reduction; • Using the ILRS CRD_check utility to verify the CRD files consistency. Results: • Formal errors of normal points are about 5 mm. • On the average 4 % of returned pulses are rejectedwhen preprocessing the observational data • Uploading the normal points in CRD format to EDC has been started in April 2012 • Disturbing facts (errors in the first version of the program).

  10. Orbital analysis of L1 & L2 observations • The analysis of the observations quality is made nowin the course of fitting to precise orbits of Lageos satelliteswhich are derived from observations of global network stations; • Preliminary coordinates of reference points of the SLR systems, defined from local geodetic surveying with respect to GNSS antenna markers, are used. BADL 56024 MJD Lageos 1

  11. 1888 (SVEL) L1 & L2 observations Mean= -0.12 cm Mean RMS= 1.02 cm

  12. 1889 (ZELL) L1 & L2 observations Mean= 0.37 cm Mean RMS= 0.86 cm

  13. 1890 (BADL) L1 & L2 observations Mean= -1.49 cm ! Mean RMS= 1.12 cm

  14. Summary • The Normal points of L1 & L2 satellites have an accuracy about 1 cm • Further work to be done: • Full use of the time keeping system (H-maser) of observatories • Investigation of stability of the system delay measurements • Improvement of station coordinates • Development of more sophisticated program for primary data analysis based on algorithm accounting the essentially irregular distribution of signal registration moments.

  15. Thank you!

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