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

Assessment of ILS protection areas impact on large aircraft

operationsMethodology

ENAC

• 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

• 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.

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:

– Method of Moments– Multilevel Fast Multipole Method– Physical Optics– Improved Physical Optics– Geometrical Optics Geometrical theory of

diffraction– Parabolic Equation– Etc…

• 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

• Simulate the receiver signal processing

• Simulate the measurement path and receiver speed

ILS simulation tools• AXIS from NANCO, Oslo

DOS program based on Physical Optics

• ATOLL from ENAC, ToulouseWindows program based on Physical Optics

• NPPM from OHIO UniversityWindows program based on Physical Optics

• IHSS 3D modeling from NAVCOM Consult

ILS radiation patterns• Toulouse Blagnac 14R

LLZ25L Antenna Diagram

-100

-95

-90

-85

-80

-75

-70

-65

-60

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

051015202530354045505560657075808590Horizontel Angle in Degree

RF

in d

B

CSB

SBO

CL_CSB

CL_SBO

10.04.2006 Flgh. Frankfurt/Main

10,6 dB

• Frankfurt 25L

A380 model• Most realistic model

Used for calculations with the Method of Moments

A380 model• Simplified models used in the simulation

tools based on Physical Optics– NPPM model

• Predominant impact of tailfin

A380 model

CSB Surface Currents SBO Surface Currents

Calculated with EMC2000 from EADS using the Method of Moments

• Simplified models used in the simulation tools based on Physical Optics– ATOLL and

AXIS model

A380 model

Radiation pattern of receiving measurements Antennas

ATOLL simulations

DFS antenna DSNA antenna

Receiver modeling• Receiver impact on measurements

P11 bis at Toulouse airport (Forward = 2886, sideway = 178, rotation = -30°)R&S EVS200 + DSNA antenna

ARTUS 324 + 45° turned dipole antenna

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

Lab measurements on some receivers and associated

ATOLL models• Test setting

ILS receiver

1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA

•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

MMR Thales




MMR Collins




Some results

P6: TailForward = 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 = -31µADisturbance 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

Some results


AXIS simulation with omnidirectionnal antenna.

Measurements with DSNA receiver antenna and EVS200




T1 = 35µA, T2 = -40µA

T1 = 28µA, T2 = -30µA

Some results


NPPM simulation with omnidirectionnal antenna.





T1 = 36µA, T2 = -38µA

T1 = 28µA, T2 = -30µA

Some results

P6 bis: TailForward = 1579m, sideway = 83m, rotation = 90°

IHSS simulation with DFS antenna.


Disturbance amplitude: T1 = 17µA, T2 = -18µA


Disturbance amplitude with A380 only: T1 = 18µA, T2 = -19 µA T1 = 18µA, T2 = -19µA

Some resultsP11 bis at 40 km/h : TailForward = 2886m, sideway = 178m, rotation = -30°



Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA


T1 = +8µA, T2 = +4µA

T1 = +7µA, T2 = +2µA

Some results

P11 bis at 40 km/h : TailForward = 2886m, sideway = 178m, rotation = -30°

AXIS simulation with omnidirectionnal antenna





T1 = +5µA, T2 = +4µA

T1 = +7µA, T2 = +2µA

Some results

P11 bis at 40 km/h : TailForward = 2886m, sideway = 178m, rotation = -30°

NPPM simulation with omnidirectionnal antenna

Measurements with DSNA receiver antenna EVS200




T1 = +3.5µA, T2 = +3µA

T1 = +7µA, T2 = +2µA

Some results

P11 bis at 13 km/h:TailForward = 2886m, sideway = 178m, rotation = -30°



Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA


T1 = +3.5µA, T2 = +4µA

T1 = +1µA, T2 = +2µA

Some results

P11 bis at 13 km/h: TailForward = 2886m, sideway = 178m, rotation = -30°

AXIS simulation with omnidirectionnal antenna





T1 = +5µA, T2 = +4µA

T1 = +1µA, T2 = +2µA

Some results

P11 bis at 13 km/h: TailForward = 2886m, sideway = 178m, rotation = -30°

NPPM simulation with omnidirectionnal antenna





T1 = +3µA, T2 = +3µA

T1 = +1µA, T2 = +2µA

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

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