Campbell SAT ARGOS Bedienungsanleitung Seite 314

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Seitenansicht 313
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-10
Assumptions: None
When the control data is 0, the Validated Data output will be the same as the non-control input data.
When the control data is not 0, the Validated Data output will be a Bad Sensor Value, or
-1,000,000.0.
2. ENVIRONMENTAL PROCESSES CATEGORY
2.1. Wind Vector Average Process
Inputs: 4 Wind Speed (D)
5 Wind Direction (D)
6 Optional Compass Input (D)
7 Gust Sample Window, 1 to 5 seconds (U)
Outputs: 1 Vector Average Wind Speed
2 Vector Average Independent Wind Direction
3 Average Scalar Wind Speed
4 Most Recent Wind Speed
5 Most Wind Direction
6 Sigma-theta
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7 Maximum Wind Gust
8 Average U vector
9 Average V vector
10 Most Recent Compass Reading
11 Wind Gust Direction
12 Vector Average Component Wind Direction
L1 Time of Maximum Wind Gust (seconds after midnight, 1/1/1970)
E1 Process Error Code
Assumptions: Compass input may be from a sensor, or left as a NULL input. If a
compass is defined, the compass input is used only if the field Add
Compass To Vane -- in the System Functions Menu of the User Menu --
is set to YES. In this case, each wind direction value is adjusted for the
latest compass reading. Note that wind direction is the direction from
which the wind is blowing.
If a null compass is defined, the value of Add Compass To Vane
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has
no effect.
Many different wind statistics are in common use. Vector averaging of some sort is necessary for reliable
wind direction estimates. You cannot simply average the vane measurement directly. As an example if
the wind blew half the time from 359 and the other half from 1, the simple vane average would yield a
mean direction of 180!
The different wind statistics calculated by the wind vector average and related processes are described
below. They are all based upon the wind speed s and direction
(including the compass bearing). From
these, the ZENO calculates the following quantities for each measurement i:
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Sigma-theta is the approximate Standard Deviation of the wind direction using the Yamartino equation.
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Refer to Section 5.7.
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