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Roma, 26/11/2007

Roma, 26/11/2007. Electromagnetic analysis of protection systems for airport structures Ing. Dario Assante Contributors : Andrea G. Chiariello Giovanni Miano Guglielmo Rubinacci Luigi Verolino. correct signal. ground station.

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Roma, 26/11/2007

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  1. Roma, 26/11/2007 Electromagnetic analysis of protection systems for airport structuresIng. Dario AssanteContributors : Andrea G. Chiariello Giovanni Miano Guglielmo Rubinacci Luigi Verolino

  2. correct signal ground station correct direction What is radio-transparency? Ideal condition

  3. noisy signal correct signal ? ground station wrong direction ? What is radio-transparency? …but some obstacles could interfere

  4. Rules for the surrounding area Different objects have to respect some distances not to interfere with the VOR signal

  5. Alford antenna VOR navigation system Characteristics of the Source

  6. Electromagnetic analysis • Not possible to verify the radio-transparency of the barrier in real site • Not possible to reproduce the real radiation pattern of a VOR • Criteria to establish the distance between an object and the VOR are unknown The behavior of the barrier is numerically simulated The behavior of the barrier is tested in a controlled place

  7. Counterpoise Source Ground A finite-element numerical model Finite-element numerical model with Comsol

  8. A finite-element numerical model Dark lines: radiated power Mesh Solution without obstacles

  9. Numerical results Dark lines: radiated power Dark lines: radiated power Basement height: 0.5 m Basement height: 2.5 m

  10. Numerical results: radiated power

  11. transmitting antenna receiving antenna Anechoic chamber

  12. Anechoic chamber Semi-anechoic chamber of the University of Naples Federico II Length: 9.048 m Width: 5.848 m Height: 5.858 m Frequency: 26 Mhz - 18 Ghz Can be turned into an anechoic chamber using mobile cones and ferrites

  13. Anechoic chamber: the antennas

  14. Measurements setup

  15. Measurements setup

  16. Measurements setup

  17. Measure results: vertical polarization Received power [dBm] Frequency [MHz]

  18. Measure results: vertical polarization Received power [dBm] Frequency [MHz]

  19. Measure results: vertical polarization Absorbed power [dBm] Frequency [MHz]

  20. Measure results: vertical polarization Absorbed power [dBm] Frequency [MHz]

  21. Measure results: vertical polarization Absorbed power [dBm] Angular position [Deg]

  22. Measure results: horizontal polarization Received power [dBm] Frequency [MHz]

  23. Measure results: horizontal polarization Received power [dBm] Frequency [MHz]

  24. Measure results: horizontal polarization Absorbed power [dBm] Frequency [MHz]

  25. Measure results: horizontal polarization Absorbed power [dBm] Frequency [MHz]

  26. Measure results: horizontal polarization Absorbed power [dBm] Angular position [Deg]

  27. Conclusions • No appreciable effects has been measured in a wide range of frequencies • The barriers have to be tested in a real situation, but it’s reasonable to presume that no interference will be found • Anyway we suggest to place the basement of the barriers under the counterpoise of the VOR

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