Kippzonen COMBILOG Data Logger Manuel d'utilisateur Page 170

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Standard deviation
s
x
x
n
n
=
²
( )²
1
Vector mean value of wind direction (VecD) and wind
speed (VecV)
The components of the horizontal wind vector
( )
u WV WD,
are
given as single values, with
WV - wind speed
WD - wind direction
The single components of the wind vector are determined by:
( )
u WV WD
1
=
* cos
( )
u WV WD
2
=
* sin
The mean values are subsequently gained by:
u
n
u i
i
n
1 1
1
1
=
=
u
n
u i
i
n
2 2
1
1
=
=
with i = Summation index
n = Number of single values within averaging period
Hardware Manual COMBILOG 1022
170
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