in a typical known wind turbine control system whilst the second strand to the right of fig6 represents the additional signals from the tower mounted sensors 122 examples of standard parameters that are monitored in existing wind turbine control systems are listed in box c these parameters may typically include the wind speed and wind direction at the nacelle monitored by the anemometer the rotor speed blade bending moments monitored by blade mounted sensors yaw and rotor positions and the power generated by the wind turbine signals indicative of these parameters are sent from the various standard sensors to the wind turbine controller box d in addition to the standard signals the controller 140 receives signals indicative of wind speed and wind direction at the tower 102 and may additionally receive readings of the tip to tower distance 142 box e these signals are obtained from the tower mounted sensors 122 however as these sensors are operating in the wake 117 of the rotor 108 the actual pressure readings box a from these sensors 122 will include some instability and turbulence effects caused by the blades 110 a 110 b 110 c these signals are filtered and or corrected box b to remove the turbulent effects in order to obtain the ambient wind speed and wind direction at the tower 102 suitable filtering and correction techniques for this purpose would be readily apparent to the person skilled in the art and are employed in existing wind turbine control systems.