The equation depends on the accurate distance of the measurement path (L). The computed
wind speeds are independent of altitude, temperature, and humidity, which are canceled out
when the transit times are measured in both directions, although the individual transit times
depend on these parameters.
3.2 Coordinate Systems: Vector and Polar
Calculations
The triangular geometry of the sensor is converted to orthogonal coordinates to achieve the
x and y components. Then the sensor converts the wind vectors into polar coordinates.
The measurement results are reported as follows:
• WMT700 reports WS (x, y) as two scalar speeds, one parallel to the N-S direction (x)
and the other (y) parallel to the W-E direction.
x = -WS × cos (WD)
y = -WS × sin (WD)
• WMT700 reports polar wind speed as a scalar speed in selected units (m/s, kt, mph,
km/h).
Polar wind direction is expressed in degrees (°). WMT700 indicates the direction that the
wind comes from. North is represented as 0°, East as 90°, South as 180°, and West as 270°.
WMT700 User Guide M211095EN-H
34
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