Vaisala WINDCAP WS425 Guia do Utilizador descarregar pdf (Página 18)

USER'S GUIDE____________________________________________________________________

18 __________________________________________________________________ M210361EN-E

Polar Wind Speed and Direction

The wind speed (WS) is represented as a scalar speed in selected units

(m/s, kt, mph, km/h). The wind direction (WD) is expressed in degrees

(°).

0212-044

Figure 1 Different Wind Speed and Direction Presentations

Wind Speed X and Y Components

The wind speed (x, y) is represented as two scalar speeds, one parallel to

the N-S direction (x) and the other (y) parallel to the W-E direction The

speed unit may be m/s, kt, mph, or km/h.

x = WS × cos (WD)

y = WS × sin (WD)

Scalar Averaging of Wind Speed and

Direction

The scalar average of wind speed and wind direction is available in both

SDI-12 submode B and serial modes. The time between each consecutive

wind speed and wind direction measurement is one second. Each wind

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 85 86

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Vaisala WINDCAP WS425 Guia do Utilizador Página 18