SECTION 11. OUTPUT PROCESSING INSTRUCTIONS

where

Ux=(Σsin Θi)/N

Uy=(Σcos Θi)/N

or, in the case of orthogonal sensors Ux=(Σ(Uei/Ui))/N Uy=(Σ(Uni/Ui))/N

where Ui=(Uei2+Uni2)1/2

Standard deviation of wind direction, σ(Θ1), using Yamartino algorithm:

σ(Θ1)=arc sin(ε)[1+0.1547 ε3]

where,

ε=[1-((Ux)2+(Uy)2)]1/2

and Ux and Uy are as defined above.

Resultant mean horizontal wind speed, U:

U=(Ue2+Un2)1/2

where for polar sensors: Ue=(ΣSi Sin Θi)/N Un=(ΣSi Cos Θi)/N

or, in the case of orthogonal sensors: Ue=(ΣUei)/N Un=(ΣUni)/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.

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

4

Repetitions

02:

4

Starting input location no.

Outputs Generated:

1 for each sample

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