1 / 15

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;

syshe
Download Presentation

Current IAA RAS activities in space geodesy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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!

More Related