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R. Weber, M. Opitz, G. Thaler

R. Weber, M. Opitz, G. Thaler. Real-Time quality control of IGS clocks and orbits. Analysis Center Workshop 2008, June 2-6 Miami. IGU clock Integrity Monitoring. RTIGS- Network: data stream used for. real time monitoring of satellite plus station clock corrections.

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R. Weber, M. Opitz, G. Thaler

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  1. R. Weber, M. Opitz, G. Thaler Real-Time quality control of IGS clocks and orbits Analysis Center Workshop 2008, June 2-6 Miami

  2. IGU clock Integrity Monitoring RTIGS- Network: data stream used for real time monitoring of satellite plus station clock corrections Development of „RTR- Control“ 2

  3. RTR- Processing Scheme • Input Data • Phase-smoothed Code Pseudoranges • IGU- Orbits/clocks • Estimation Model • if-LC+ Corrections, Least Squares Adjustment • Parameters (estimated every 15s) • Receiver- and Satellite Clock Corrections • Remaining • Range Residuals indicating multipath effects and orbit • deficiencies 3

  4. Web-Portal Webpage - http://rtclocks.hg.tuwien.ac.at 4

  5. Receiver Clock / Station GOLD 6

  6. Receiver Clock / Station GOLD

  7. Receiver Clock / Station TIDB

  8. Receiver Clock / Station COCO

  9. Receiver Clock / Station TOW2

  10. Receiver Clock / Station MAS1

  11. Receiver Clock / Station KIRU

  12. Receiver Clock / Station STR1/no IGS

  13. Satellite Clock PRN01 14

  14. Satellite Clock PRN29 15

  15. Satellite Clock PRN30

  16. Satellite Clock PRN24

  17. Satellite Clock PRN05 18

  18. Pseudorange Residuals 19

  19. Pseudorange Residuals 20

  20. RTR- Control in stable operation since begin 2007! • ongoing Developments • Improved cycle slip detection • choice of reference clock • integrate effort into RT-PP • deliver clock estimates to RT-PP • improve the webpage • derive satellite clock predictions and RT-orbits • RTIGS- Network • upgraded station number and distribution urgently • requested 21

  21. Clock prediction Obtain satellite clock corrections from RTR-Control Update satllite specific state vector (3 coeff / sat.). Predict clock corrections for 6-hours interval (every 15 minutes/per satellite) GPS-RT-orbit determination Initialisation: Obtain coordinates XSAT and velocities VSAT from the IGS ultrarapid orbits (for each satellite) Input data from RTR-Control: corrected ranges, satellite and station clock corrections, formal errors of satellite and station clock corrections, data is available every 15 seconds! !Kalman-Filter approach! Calculation of Position and velocity every 15 seconds

  22. Thank you for your attention !

  23. Receiver CLock 24 RESULTS

  24. Receiver Clock (reference) 25 RESULTS

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