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Published byPriscilla Dewing Modified over 2 years ago

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Assessment of ILS protection areas impact on large aircraft operations Methodology ENAC

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Selection of test points to be tested during real ground and flight measurements with an A380 aircraft Simulate these points with various modeling tools : –To reduce the number of points to be measured to the most significant ones –To get some pre-measurement predictions in order to evaluate the prediction performances of the tools

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Analyze the measurements and evaluate the impact of the A380 on the size of the critical and sensitive areas Compare the measurements with the predictions of the modeling tools and evaluate the correlation between simulations and measurements.

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ILS simulation methodology Simulation of the radiation patterns delivered by the ILS Choose a method to simulate the propagation of electromagnetic waves and scattering on obstacles:

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–Method of Moments –Multilevel Fast Multipole Method –Physical Optics –Improved Physical Optics –Geometrical Optics Geometrical theory of diffraction –Parabolic Equation –Etc…

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Design a model of the object to evaluate (A380) that fits with the simulation method and represents the most critical parts involved in the scattering of electromagnetic waves Simulate the radiation pattern of the receiver’s antenna

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Simulate the receiver signal processing Simulate the measurement path and receiver speed

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ILS simulation tools AXIS from NANCO, Oslo DOS program based on Physical Optics ATOLL from ENAC, Toulouse Windows program based on Physical Optics NPPM from OHIO University Windows program based on Physical Optics IHSS 3D modeling from NAVCOM Consult

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ILS radiation patterns Toulouse Blagnac 14R

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Frankfurt 25L

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A380 model Most realistic model Used for calculations with the Method of Moments

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A380 model Simplified models used in the simulation tools based on Physical Optics –NPPM model

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Predominant impact of tailfin A380 model CSB Surface CurrentsSBO Surface Currents Calculated with EMC2000 from EADS using the Method of Moments

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Simplified models used in the simulation tools based on Physical Optics –ATOLL and AXIS model A380 model

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Radiation pattern of receiving measurements Antennas ATOLL simulations DFS antennaDSNA antenna

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Receiver modeling Receiver impact on measurements P11 bis at Toulouse airport (Forward = 2886, sideway = 178, rotation = -30°) R&S EVS200 + DSNA antenna ARTUS ° turned dipole antenna

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Receiver modeling Receiver and speed impact on measurements P11 bis at Toulouse airport (Forward = 2886, sideway = 178, rotation = -30°) Measurement at 40 km/h Measurement at 13 km/h

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Lab measurements on some receivers and associated ATOLL models Test setting ILS receiver

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1Hz2Hz3Hz4Hz5Hz6Hz7Hz8Hz9Hz10Hz11Hz12Hz13Hz14HzNA AGC cut-off frequency: 9Hz AGC filter order: 4 Model parameters: LF band pass filters: 21Hz LF band pass filter order: 5 LF detection filter cut-off frequency: 8Hz LF detection filter order: 2 R&S EVS 300

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MMR Thales 1Hz2Hz3Hz4Hz5Hz6Hz7Hz8Hz9Hz10Hz11Hz12Hz13Hz14HzNA AGC cut-off frequency: 10Hz AGC filter order: 4 Model parameters: LF band pass filters: 4Hz LF band pass filter order: 2 LF detection filter cut-off frequency: 3Hz LF detection filter order: 2

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MMR Collins 1Hz2Hz3Hz4Hz5Hz6Hz7Hz8Hz9Hz10Hz11Hz12Hz13Hz14HzNA AGC cut-off frequency: 3Hz AGC filter order: 3 Model parameters: LF band pass filters: 10Hz LF band pass filter order: 3 LF detection filter cut-off frequency: 6Hz LF detection filter order: 2

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Some results P6: Tail Forward = 1579m, sideway = 57m, rotation = 90° ATOLL simulation and measurements with DSNA receiver antenna (orange = raw data) and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = 27 µA, T2 = -31µA Disturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = 26µA, T2 = -29µA T1 = 28µA, T2 = -30µA

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Some results P6: Tail Forward = 1579m, sideway = 57m, rotation = 90° AXIS simulation with omnidirectionnal antenna. Measurements with DSNA receiver antenna and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = 27 µA, T2 = -31µA Disturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = 35µA, T2 = -40µA T1 = 28µA, T2 = -30µA

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Some results P6: Tail Forward = 1579m, sideway = 57m, rotation = 90° NPPM simulation with omnidirectionnal antenna. Measurements with DSNA receiver antenna and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = 27 µA, T2 = -31µA Disturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = 36µA, T2 = -38µA T1 = 28µA, T2 = -30µA

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Some results P6 bis: Tail Forward = 1579m, sideway = 83m, rotation = 90° IHSS simulation with DFS antenna. Measurements with DSNA receiver antenna and EVS200 Disturbance amplitude: T1 = 17µA, T2 = -18µA Disturbance amplitude with A380: T1 = 17 µA, T2 = -20µA Disturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA Disturbance amplitude with A380 only: T1 = 18µA, T2 = -19 µA T1 = 18µA, T2 = -19µA

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Some results P11 bis at 40 km/h : Tail Forward = 2886m, sideway = 178m, rotation = -30° ATOLL simulation and measurements with DSNA receiver antenna (orange = raw data) and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µA Disturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = +8µA, T2 = +4µA T1 = +7µA, T2 = +2µA

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Some results P11 bis at 40 km/h : Tail Forward = 2886m, sideway = 178m, rotation = -30° AXIS simulation with omnidirectionnal antenna Measurements with DSNA receiver antenna and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µA Disturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = +5µA, T2 = +4µA T1 = +7µA, T2 = +2µA

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Some results P11 bis at 40 km/h : Tail Forward = 2886m, sideway = 178m, rotation = -30° NPPM simulation with omnidirectionnal antenna Measurements with DSNA receiver antenna EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µA Disturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = +3.5µA, T2 = +3µA T1 = +7µA, T2 = +2µA

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Some results P11 bis at 13 km/h: Tail Forward = 2886m, sideway = 178m, rotation = -30° ATOLL simulation and measurements with DSNA receiver antenna (orange = raw data) and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µA Disturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = +3.5µA, T2 = +4µA T1 = +1µA, T2 = +2µA

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Some results P11 bis at 13 km/h: Tail Forward = 2886m, sideway = 178m, rotation = -30° AXIS simulation with omnidirectionnal antenna Measurements with DSNA receiver antenna and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µA Disturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = +5µA, T2 = +4µA T1 = +1µA, T2 = +2µA

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Some results P11 bis at 13 km/h: Tail Forward = 2886m, sideway = 178m, rotation = -30° NPPM simulation with omnidirectionnal antenna Measurements with DSNA receiver antenna and EVS200 Disturbance amplitude: Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µA Disturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA T1 = +3µA, T2 = +3µA T1 = +1µA, T2 = +2µA

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