Campbell Manufacturing CR10 User Manual
SECTION 11. OUTPUT PROCESSING INSTRUCTIONS
11-3
where
Ux=(
Σsin Θ
i
)/N
Uy=(
Σcos Θ
i
)/N
or, in the case of orthogonal sensors
Ux=(
Σ(Ue
i
/U
i
))/N
Uy=(
Σ(Un
i
/U
i
))/N
where U
i
=(Ue
i
2
+Un
i
2
)
1/2
Standard deviation of wind direction,
σ(Θ1),
using Yamartino algorithm:
σ(Θ1)=arc sin(ε)[1+0.1547 ε
3
]
where,
ε=[1-((Ux)
2
+(Uy)
2
)]
1/2
and Ux and Uy are as defined above.
Resultant mean horizontal wind speed, U:
U=(Ue
2
+Un
2
)
1/2
where for polar sensors:
Ue=(
ΣS
i
Sin
Θ
i
)/N
Un=(
ΣS
i
Cos
Θ
i
)/N
or, in the case of orthogonal sensors:
Ue=(
ΣUe
i
)/N
Un=(
ΣUn
i
)/N
Resultant mean wind direction,
Θu:
Θu=Arctan (Ue/Un)
Standard deviation of wind direction,
σ(Θu),
using Campbell Scientific algorithm:
σ(Θu)=81(1-U/S)
1/2
*** 70 SAMPLE ***
FUNCTION
This instruction stores the value from each
specified input location. The value(s) stored
are those in the input location(s) when
Instruction 70 is executed with the Output Flag
set high.
This instruction stores the value from each
specified input location. The value(s) stored
are those in the input location(s) when
Instruction 70 is executed with the Output Flag
set high.
PARAM.
DATA
NUMBER
TYPE
DESCRIPTION
01:
4
Repetitions
02:
4
Starting input location no.
Outputs Generated:
1 for each sample