Assessment of ILS protection areas impact on large aircraft operations

1
Assessment of ILS protection areas impact on
large aircraft operations

• Methodology
• ENAC

2

• 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

3

• 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.

4
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

5

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

6

• 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 receivers
  antenna

7

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

8
ILS simulation tools

• AXIS from NANCO, OsloDOS 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

9
ILS radiation patterns

• Toulouse Blagnac 14R

10

• Frankfurt 25L

11
A380 model

• Most realistic model

Used for calculations with the Method of Moments
12
A380 model

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

13
A380 model

• Predominant impact of tailfin

CSB Surface Currents
SBO Surface Currents
Calculated with EMC2000 from EADS using the
Method of Moments
14
A380 model

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

15
Radiation pattern of receiving measurements
Antennas
DFS antenna
DSNA antenna

• ATOLL simulations

16
Receiver modeling

• Receiver impact on measurements

P11 bis  at Toulouse airport (Forward  2886,
sideway 178, rotation -30)
RS EVS200 DSNA antenna
ARTUS 324 45 turned dipole antenna
17
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
18
Lab measurements on some receivers and associated
ATOLL models

• Test setting

ILS receiver
19
RS EVS 300
1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA
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

• AGC cut-off frequency 9Hz
• AGC filter order 4

20
MMR Thales
1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA
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

• AGC cut-off frequency 10Hz
• AGC filter order 4

21
MMR Collins
1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA
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

• AGC cut-off frequency 3Hz
• AGC filter order 3

22
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
T1 26µA,
T2 -29µA
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 28µA,
T2 -30µA
23
Some results

• P6 Tail
• Forward  1579m,
• sideway 57m,
• rotation 90
• AXIS simulation with omnidirectionnal antenna.
• Measurements with DSNA receiver antenna and EVS200

Disturbance amplitude
T1 35µA,
T2 -40µA
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 28µA,
T2 -30µA
24
Some results

• P6 Tail
• Forward  1579m,
• sideway 57m,
• rotation 90
• NPPM simulation with omnidirectionnal antenna.
• Measurements with DSNA receiver antenna and EVS200

Disturbance amplitude
T1 36µA,
T2 -38µA
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 28µA,
T2 -30µA
25
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
26
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
T1 8µA,
T2 4µA
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 7µA,
T2 2µA
27
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
T1 5µA,
T2 4µA
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 7µA,
T2 2µA
28
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
T1 3.5µA,
T2 3µA
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 7µA,
T2 2µA
29
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
T1 3.5µA,
T2 4µA
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 1µA,
T2 2µA
30
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
T1 5µA,
T2 4µA
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 1µA,
T2 2µA
31
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
T1 3µA,
T2 3µA
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 1µA,
T2 2µA