Wind Shear Detection

Wake Watch’s Wind Shear Detection System helps airport improve safety and costly go arounds.

Wake Watch’s Wind Shear Detection and Warning Solution makes real time measurements of dangerous wind shear conditions on approach. The system can measure horizontal wind shear over distances between 100m and 600m every 3 seconds. Vertical wind shear is also measured over 8 heights between 10m to 80m every 3 seconds. The very high update rate of this system enables timely measurements of  any shear that can adversely affect aircraft landing performance including wind shear due to aircraft wake vortices.
This system is also well suited to making measurements of the mechanical wind shear caused by buildings and terrain around airports.

Wind Shear measurement system testing at Melbourne Airport. Wind profilers are 100m apart to measure every 3 seconds, Horizintal Wind Shear over 100m and Vertical Wind Shear from 10m to 85m.
Real time wind shear system during testing at Officer. The two wind profilers are located 160m apart.
24 hour measurement of the probability that the wind speed difference over a horizontal distance of 100m will exceed the 6knot (3.1m/s) and 7 knot (3.6m/s) wind shear criteria. In this case with an average wind speed of 6.6 m/s @ 10m neither criteria is exceeded. If a 2 minute average is used instead of the 10 minute average, the probability of the criteria being exceeded increases.
24 hour measurement of the probability that the vertical wind shear will exceed 5 knots/100ft with an average wind speed of 6.6 m/s @ 10m. The wind shear is greatest close to the ground.
This result shows that the vertical wind shear exceeds 5 knots/100ft for 40% of the time at 15m and for 12% of the time at 25m. At greater heights the wind shear is much lower. This level of wind shear close to the ground makes landing an aircraft more difficult.
The wind shear system is available for 86.5% of the time, the unavailable time is due to aircraft in the immediate vicinity of the wind shear system. The time between measurements to a height of 80m is 3.19 seconds. !0 minute averaging is used, shorter averaging times will result in higher peak wind shear values.