空管资料3(23)

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Technical realization of the solution
Page 24 / date / name / ©Vaisala
Support elements
Organize workshop or seminar in order to:
 give insight into the atmospheric phenomena behind low-level
windshear
 discuss the implications of windshear for airport operations and
aviation safety
Requirements definition and consulting
Requirements definition and consulting
Solution design
Solution design
Solution deli ver y
Solution deli ver y
Life-cycle ser vices
Life-cycle ser vices
Support el ements
Support el ements
Technical realization of the solution
Technical realization of the solution
Page 25 / date / name / ©Vaisala
One possible technical
realization
of the solution
Requirements definition and consulting
Requirements definition and consulting
Solution design
Solution design
Solution deli ver y
Solution deli ver y
Life-cycle ser vices
Life-cycle ser vices
Support el ements
Support el ements
Technical realization of the solution
Technical realization of the solution
Page 26 / date / name / ©Vaisala
LLWAS
Wind data is analyzed in accordance with a wind shear
algorithm developed by NCAR for FAA
The algorithm employed by Vaisala LLWAS system is the
latest Phase III algorithm and is patented by NCAR
Vaisala is a licensee for that patented algorithm
 The algorithm is a module running on a AviMet system platform
 AviMet platform features like hot-standby duplication, displays and
workstation concept are available
Page 27 / date / name / ©Vaisala
LLWAS Algorithm
 A network of anemometers in and around the airport provide direct
wind measurements.
Wind data between sensors are analyzed to determine if there is
wind divergence (aircraft performance decreasing shear) or
convergence (aircraft performance increasing shear) in the
network.
 The intensity, location, and type of shear are calculated and the
standardized warnings are generated.
 Output is specific to every aircraft operation and runway heading.
Page 28 / date / name / ©Vaisala
LLWAS
 Low level wind shear and microburst conditions are assessed by
processing wind data collected from an array or network of wind
sensors.
 Number of wind sites is typically 8-16
 Wind sites consists normally of:
– 20-30 meter masts
– WAS425 ultrasonic sensor
– Radio Modem
– Solar panel with battery
Page 29 / date / name / ©Vaisala
LLWAS
Two- kilometer
times two
kilometer grid
Page 30 / date / name / ©Vaisala
LLWAS Siting, Shenzen
Page 31 / date / name / ©Vaisala
LLWAS Siting, Dalian
Page 32 / date / name / ©Vaisala
LLWAS Siting
LLWAS siting has been done in China for:
Shenzhen
Dalian
Chanchun
Beijing
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New AviMet displays
Page 34 / date / name / ©Vaisala
FAA Wind Shear Terminology and Alert
Criteria
 ”Wind Shear With Loss”
 If the estimated IAS loss is between 15 and 30 knots, over 4 km of
flight
 “Microburst”
 If the estimated IAS loss is 30 knots or greater, over 4 km
 “Wind Shear With Gain”
 If a convergence zone is detected with a wind shear of 15 knots
(IAS gain) or greater
Page 35 / date / name / ©Vaisala
Vaisala wind field analysis
Wind Profiler LLWAS
AWOS
Winds
Weather
radar
Airport wind information
Page 36 / date / name / ©Vaisala
Vaisala wind field analysis
Airport wind information
Other users Pilots
Forecaster ATC
OOthtehreur suesresrs
Page 37 / date / name / ©Vaisala
AviMet Wind Profiler displays
Highlights
 Integrates LLWAS horizontal wind field and WP vertical wind
field for 3D wind shear alerts
 LLWAS and WP information is easy to use and offer
integrated user interface
Offers the horizontal and vertical wind information needed for
ATC operations and meteorologists
Page 38 / date / name / ©Vaisala
AviMet Wind Profiler displays
1. Alert when wind difference between two height levels
exceed pre-set limit
2. Alert for cross-wind and headwind vertical wind
shear separately
3. Alerts on temporal changes on vertical windshear
　
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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