profiling the abl using a small unmanned meteorological observer (sumo) - wind measurements -
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Profiling the ABL using a Small Unmanned Meteorological Observer (SUMO) - Wind measurements -. Stephanie Mayer PhD – Seminar October 23, 2007. Stephanie Mayer, GFI. Why remote-controlled aircrafts?. repeated, fine-time-scale soundings to investigate meteorological parameters of the ABL - PowerPoint PPT PresentationTRANSCRIPT
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Profiling the ABL using a Profiling the ABL using a Small Unmanned Meteorological Small Unmanned Meteorological
Observer (SUMO)Observer (SUMO)
- Wind measurements -- Wind measurements -
Stephanie Mayer
PhD – Seminar
October 23, 2007
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Why remote-controlled aircrafts?Why remote-controlled aircrafts?
• repeated, fine-time-scale soundings to investigate meteorological parameters of the ABL
• economical, controllable and recoverable platform to carry meteorological sensors and instrumentation for in situ measurements of atmospheric parameters (Konrad, 1970)
• ability to capture a 3-D image of the state of the ABL• extremely flexible
• limitations: fog/clouds, precipitation, storms
Stephanie Mayer, GFI
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Wind triangle Wind triangle
Stephanie Mayer, GFI
wind vector:wind speed
wind direction
heading vector:true air speed (TAS)azimuth angle (Ψ)
course vector:
ground speed (GS)
flight-path azimuth (X)
heading + wind = course
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Required variablesRequired variables
Stephanie Mayer, GFI
namename abbreviationabbreviation devicedevice
ground speed GSTrimble GPS
flight-path azimuth Χ
true air speed TAS MiniAir
angle of sideslip β wind vane
azimuth angle (yaw) Ψ
inclination angle (pitch) θ Microstrain
bank angle (roll) φ
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Transformation of heading (1)Transformation of heading (1)
Stephanie Mayer, GFI
aerodynamic
body
geodetic
Mba(α,β)
Mgb(ψ,θ,φ)
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Transformation of heading (2)Transformation of heading (2)
1sinsincossin
0cossin
sinsincoscoscos
βαβα
ββ
αβαβα
baM
Stephanie Mayer, GFI
ΘΦΘΦΘΨΦ
ΨΘΦ
ΨΦ
ΨΘΦΨΘ
ΨΦ
ΨΘΦ
ΨΦ
ΨΘΦΨΘ
coscoscossinsinsinsin
cossincos
sincos
cossinsincoscos
cossin
sinsincos
coscos
sinsinsinsincos
gbM
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SUMO – some technical detailsSUMO – some technical details
Stephanie Mayer, GFI
specificationsspecifications
wing span 80 cm
length 75 cm
weight 600 g
performanceperformance
horizontal (air) speed 12-18 m/s 35 m/s
climb rate 7-10 m/s 15 m/s
altitude range above ground ~ 3.5 km
horizontal range / endurance ~4 km / ~0.5 h
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Wind estimation by flying in circlesWind estimation by flying in circles
Stephanie Mayer, GFI
down
GS [m/s]
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SummarySummary
Stephanie Mayer, GFI
• two methods of retrieving airborne wind profiles have been shown
• 1. method: free flight pattern
but many components have to be used• 2. method: less equipment
but limited to circling pattern• both methods are quite promising