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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

IWAKEinstrumentation systems for on-board wake vortex

and other hazards detection, warning, and avoidanceS. Rahm, DLR

Thales Avionics (F, coordinator) data unit

Airbus Deutschland GmbH (D) simulator

DLR (D) lidar (CTI) + long range data unit

NLR (NL) aircraft + simulation

University of Hamburg (D) 2 m laser development

LISA Laser (D) 2 m laser development

Université catholique de Louvain signal processing

Fraunhofer IOF of Jena (D) scanner

start : 01/05/02; end : 31/04/05; Contract no.: G4RD-CT-2002-007788

nstrumentation systemsfor on-board

vortexand other hazards detection,

warning and avoidance

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

IWAKE: NLR Cessna with “Bubble” and scan geometry

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Scanning range: 3° vertical x 12° horizontal; 75 horizontal linesCenter of scan : 9° to the right und 9° to the ground with respect to aircraft axisDuration of one scan: 5 s / pattern + 1 s flyback=> 66 ms / line with approx. 33 shots @ 500 Hz PRF

Scan Pattern

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

IWAKE instrument (DLR part with IOF scanner)

lidar + cooling data rack

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Installation in NLR Cessna

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Inside Cessna Citation

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

“Scanner Bubble”

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Flights in the area of Toulouse:

June, 22: LTA wake vortex flight

June, 23: long range wind

June, 25: LTA wake vortex flight

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

LTA wake vortex measurements 25/06/2004

The wake vortex is moving from the right to the left side blue at the LOS plot and green/yellow at the spectral width

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

LOS detection field

2120

2000

1880

1760

1640

1520

1400

1280

1160

1040

920

800

Range [m]

LTA wake vortex measurements 25/06/2004preliminary results from UCL TELE (Belgium)

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Long range measurements 23/06/2004LOS wind speed (top)+ difference between range gates (bottom)

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Long range measurements 23/06/2004 (zoom)

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Long range measurements 23/06/2004correlation at different range gates

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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005

Conclusion

- IWAKE demonstrated axial detectability of wake vortices- Clear air turbulence: Correlation between turbulence and acceleration needs exact LOS along flight track

Groundbased + airborne A380 wake vortex measurements planned at DLR for this year (other project).