Содержание
- 2. Overview Summary of Issue Simulation Description Scenarios Results
- 3. Summary of Issue Several navigation aids share the same VHF spectrum (108 – 118 MHz) VDB
- 4. Summary of Issue, Continued Aircraft installation contributes to D/U limits Antenna gain variation due to difference
- 5. Simulation Overview and Purpose Model nav aid transmitters, including transmission loss (ILS, VOR, VDB) Model aircraft
- 6. Simulation Description Simulate Aircraft on Approach 3 degrees, 2.25 degrees (full scale low), 1.35 degrees (minimum
- 7. 1. Simulate Aircraft on Approach (not to scale) ILS Near ILS Far VDB / VOR Grid
- 8. The green grid denotes the modeled area (only covers one side of the runway) Runway Length:
- 9. Aircraft positions simulated every 0.002 nmi Aircraft positions simulated every 0.01 nmi Additional Position Sampling Resolution
- 10. 2. Simulate Airborne Antenna Patterns Simulate no Airborne Antenna Pattern Provides Signal-In-Space Desired / Undesired ratio
- 11. 3. Simulate VHF Nav Aids and Transmit Patterns ILS LOC VOR VDB
- 12. 1. Simulate ILS LOC Signal Strength ILS Localizer Antenna Pattern Source: Stefan Müller and Felix Butsch
- 13. ILS Signal Strength Equation FSPL(distance = 10*log10(distance) + 20*log10(108 MHz) – 147.55 + 29.1527 FSPL(distance >822.7611
- 14. Simulated Approach Height vs. LOC Distance Comparing simulated antenna heights with heights above LOC antenna simulated
- 15. Has same general shape, differences could be due to differences in Ground Antenna Gain from the
- 16. Due to a jump in the traced Transmitter gain antenna Recreating Navcom ILS overflight plots with
- 17. 2. Simulate VDB Signal Strength VDB simplified model Simulated as omnidirectional with transmit power of 47
- 18. Compare Simple VDB Model (Red) with Ohio University EM Model and Flight Measurements From: Skidmore, Wilson,
- 19. Comparing HPOL Results
- 20. Difference OU HPOL Sim and Simple Model Matches roughly well within +/-5dB, not accounting for fades
- 21. 3. Simulate VOR Signal Strength VOR simplified model Simulated as +6dB gain below 60 degrees elevation,
- 22. Compare Simple VOR Model with Bremen Flight Inspection Measurements The EIRP is set as 53 dBm
- 23. Bremen test data vs Simulated VOR Signal (No Simulated Aircraft Antenna) 27 Approach, Go Around –
- 24. Bremen test data vs Simulated VOR Signal (No Simulated Aircraft Antenna) 09 Approach – VOR overflight
- 25. Transmit Simplified Models Summary ILS LOC Simplified model based on NavCom gain vs. el and 1/R,
- 26. D/U Simulation Results
- 27. D/U Simulation Scenarios VDB Desired / ILS Near Undesired VDB Desired / ILS Far Undesired VDB
- 28. VDB Desired / ILS Near Undesired VDB Location Grid and ILS Near Stable Location Scatter plots
- 29. Formulas EIRPVDB = 47 dBm [1] EIRPILS in the main beam = 60 dBm [1] Gtransmitter,VDB
- 30. Explanation on the Scatter plots Each circle corresponds with a GBAS antenna location. If the dot
- 31. Full A/C Flight Path
- 32. FPA = 1.35 degrees (lower edge of coverage) Plot 1 : Plots of the D/U vs.
- 33. 1.35 Degrees, No Antenna , U = ILS Near
- 34. 1.35 Degrees, Boeing VOR , U = ILS Near
- 35. FPA = 2.25 degrees (full scale low) Plot 1 : Plots of the D/U Plot 2
- 36. 2.25 Degrees, No Antenna , U = ILS Near
- 37. 2.25 Degrees, Boeing VOR , U = ILS Near
- 38. FPA = 3 degrees (On Glideslope) Plot 1 : Plots of the D/U Plot 2 :
- 39. 3 Degrees, No Antenna , U = ILS Near
- 40. 3 Degrees, Boeing VOR , U = ILS Near
- 41. A/C Flight Path to 200 ft
- 42. FPA = 1.35 degrees (Lowest Coverage) Plot 1 : Plots of the D/U Plot 2 :
- 43. 1.35 Degrees, No Antenna, U = ILS Near
- 44. 1.35 Degrees, Boeing VOR, U = ILS Near
- 45. FPA = 2.25 degrees (Full Scale Low) Plot 1 : Plots of the D/U Plot 2
- 46. 2.25 Degrees, No Antenna, U = ILS Near
- 47. 2.25 Degrees, Boeing VOR, U = ILS Near
- 48. FPA = 3 degrees (On Glideslope) Plot 1 : Plots of the D/U Plot 2 :
- 49. 3 Degrees, No Antenna, U = ILS Near
- 50. 3 Degrees, Boeing VOR, U = ILS Near
- 51. Summary VDB / ILS Near D/U Antenna Gain Variation Contribution to worst case D/U at the
- 52. VDB Desired / ILS Far Undesired VDB Location Grid and ILS Far Stable Location Scatter plots
- 53. Formulas EIRPVDB = 47 dBm [1] EIRPILS in the main beam = 60 dBm [1] GTransmitter,VDB
- 54. Full A/C Flight Path
- 55. 1.35 Degrees, No Antenna, U = ILS Far
- 56. 2.25 Degrees, No Antenna, U = ILS Far
- 57. 3 Degrees, No Antenna, U = ILS Far
- 58. A/C Flight Path to 200 ft
- 59. 1.35 Degrees, No Antenna, U = ILS Far
- 60. 2.25 Degrees, No Antenna, U = ILS Far
- 61. 3 Degrees, No Antenna, U = ILS Far
- 62. Summary VDB / ILS Far D/U Antenna Gain Variation Contribution to worst case D/U at the
- 63. VDB Desired / VOR Undesired VDB Location Grid and VOR Location Grid Scatter plots for VDB
- 64. Assumptions VOR antenna is 10 meters above the ground VDB antenna is 10 meters above the
- 65. Formulas EIRPVDB = 47 dBm [1] EIRPVOR = 50 dBm [1] GTransmitter,VDB = 0 dB (Isotropic
- 66. Full A/C Flight Path
- 67. 1.35 Degrees, No Antenna, Points = VDB Note: The size for locations with the number of
- 68. 1.35 Degrees, No Antenna, Points = VOR Note: The size for locations with the number of
- 69. 2.25 Degrees, No Antenna , Points = VDB Note: The size for locations with the number
- 70. 2.25 Degrees, No Antenna , Points = VOR Note: The size for locations with the number
- 71. 3 Degrees, No Antenna , Points = VDB Note: The size for locations with the number
- 72. 3 Degrees, No Antenna , Points = VOR Note: The size for locations with the number
- 73. A/C Flight Path to 200 ft
- 74. 1.35 Degrees, No Antenna , Points = VDB Note: The size for locations with the number
- 75. 1.35 Degrees, No Antenna , Points = VOR Note: The size for locations with the number
- 76. 2.25 Degrees, No Antenna , Points = VDB Note: The size for locations with the number
- 77. 2.25 Degrees, No Antenna , Points = VOR Note: The size for locations with the number
- 78. 3 Degrees, No Antenna , Points = VDB Note: The size for locations with the number
- 79. 3 Degrees, No Antenna , Points = VOR Note: The size for locations with the number
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