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ASSESSMENT OF THE EGNOS SIGNAL AVAILABILITY FOR LAND MOBILE USER

ASSESSMENT OF THE EGNOS SIGNAL AVAILABILITY FOR LAND MOBILE USER. Pavel Kovář Franti šek Vejražka Libor Seidl Pavel Puri č er Czech Technical University in Prague. Agenda. EGNOS – main characteristics Mobile satellite channel model l ing EGNOS fast detection algorithm

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ASSESSMENT OF THE EGNOS SIGNAL AVAILABILITY FOR LAND MOBILE USER

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  1. Assessment of the EGNOS Signal Availability for Land Mobile User

  2. ASSESSMENT OF THE EGNOS SIGNAL AVAILABILITY FOR LAND MOBILE USER Pavel Kovář František Vejražka Libor Seidl Pavel Puričer Czech Technical University in Prague

  3. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  4. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  5. EGNOS – main characteristics • EGNOS European Geostationary Navigation Overlay System • SBAS system which disseminates for GPS and GLONASS in Europe region • Wide Area Differential Corrections • integrity information • provides users with Safety of Live Services • is compatible with • US – WAAS • Asia MSAS and • Indian GAGAN Assessment of the EGNOS Signal Availability for Land Mobile User

  6. EGNOS – main characteristics • EGNOS Satellites – full constellation Assessment of the EGNOS Signal Availability for Land Mobile User

  7. EGNOS – main characteristics • EGNOS – ESTBconstellation winter 2005 Assessment of the EGNOS Signal Availability for Land Mobile User

  8. EGNOS – main characteristics • Land mobile user problem: • Limited visibility of the EGNOS satellites Assessment of the EGNOS Signal Availability for Land Mobile User

  9. EGNOS – main characteristics • Land mobile user problem: • Limited visibility of the EGNOS satellites GNSS EGNOS Assessment of the EGNOS Signal Availability for Land Mobile User

  10. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  11. Mobile satellite channel modelling • Two state Markov process • dependent on run distance • states • blocked Line Of Sight (LOS) • unblocked LOS • model parameters • μ – partial intensity of blocked LOS • λ – partial intensity of unblocked LOS • determined by mobile experiment Assessment of the EGNOS Signal Availability for Land Mobile User

  12. Mobile satellite channel modelling Particular transition intensity matrix Particular transition probability matrix Assessment of the EGNOS Signal Availability for Land Mobile User

  13. Mobile satellite channel modelling Analytically derived statistics • Probability of the EGNOS signal reception • Probability of reception of at last one message from N possible ones • Statistics of the antenna diversity reception (not discussed here) Assessment of the EGNOS Signal Availability for Land Mobile User

  14. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  15. EGNOS fast detection algorithm • Parallel correlation method Assessment of the EGNOS Signal Availability for Land Mobile User

  16. EGNOS fast detection algorithm Features • parallel correlation • fast response on the EGNOS signal (8 ms) • shadowing process measurement in real time Assessment of the EGNOS Signal Availability for Land Mobile User

  17. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  18. Experimental GNSS Receiver GNSS antenna RFunit DSP and Processor LNA Channel 1 Synthesizer FPGA XilinxVirtex-II Pro Channel 2 A/D LNA PowerPCjádro PowerPCjádro Channel 3 LNA Assessment of the EGNOS Signal Availability for Land Mobile User

  19. Experimental GNSS Receiver Main features: • Four independent RF channels • Intermediate frequency 140 MHz • Sampling frequency up to 80 MHz • Digital signal processing - Xilings Virtex II Pro • Two PowerPC processors (RISC 32 bits, 400 MHz) • 5M gates programmable logic • 232 embedded multipliers • 19” rack housing Assessment of the EGNOS Signal Availability for Land Mobile User

  20. Experimental GNSS Receiver Digital signal processor • ADC Board • 4 channels • 8 bits • Sampling frequency 80 MHz • FPGA Virtex-II Pro Assessment of the EGNOS Signal Availability for Land Mobile User

  21. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  22. Measurements and results Car installation Experimental receiver Odometer on trailer Antenna Assessment of the EGNOS Signal Availability for Land Mobile User

  23. Measurements and results Model parameters – PRN 131 Assessment of the EGNOS Signal Availability for Land Mobile User

  24. Measurements and results Typical measurement results Assessment of the EGNOS Signal Availability for Land Mobile User

  25. Comparison of the measured satellite blocked and unblocked distance distribution with the model Measurements and results Unblocked distance distribution Blocked distance distribution 0.025 0.025 Theoretical value Theoretical value Estimation from realization Estimation from realization 0.02 0.02 0.015 0.015 Pdf Pdf 0.01 0.01 0.005 0.005 0 0 0 100 200 300 400 500 0 100 200 300 400 500 Distance [m] Distance [m] Assessment of the EGNOS Signal Availability for Land Mobile User

  26. Measurements and results Assessment of the EGNOS Signal Availability for Land Mobile User

  27. Comparison of the measured satellite blocked and unblocked distance distribution with the model 1 1 0.9 0.9 0.8 0.8 0.7 0.7 Pr Pr 0.6 0.6 0.5 0.5 0.4 0.4 10 10 8 8 30 30 25 25 6 6 20 20 15 15 4 4 10 10 2 2 5 5 N N v [m/s] v [m/s] Measurements and results Assessment of the EGNOS Signal Availability for Land Mobile User

  28. Agenda • EGNOS – main characteristics • Mobile satellite channel modelling • EGNOS fast detection algorithm • Experimental GNSS receiver • Measurements and results • Conclusions Assessment of the EGNOS Signal Availability for Land Mobile User

  29. Conclusions • Markov model of shadowing dependent on distance was approved • The model parameters for different environment were determined in ESTB phase • Good conformity between model and measurement was obtained Assessment of the EGNOS Signal Availability for Land Mobile User

  30. Thank you for your attention Assessment of the EGNOS Signal Availability for Land Mobile User

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