A method of correcting blade pitch in a wind turbine having a tower and a plurality of rotor blades , the method comprising: receiving sensor output data from one or more wind turbine sensors , the sensor output data including data indicative of excitation of the tower for a plurality of different pitch angles of a particular one of the blades , wherein the received sensor output data corresponds to a pitch angle of the remaining blades being constant; determining a corrected pitch reference of the particular blade , the corrected pitch reference corresponding to a minimum tower excitation based on the received sensor output data; and, sending the corrected pitch reference to a pitch actuator system of the particular blade , wherein the wind turbine is operated at each of the plurality of pitch angles of the particular blade for a predetermined period to receive the sensor output data for the plurality of different pitch angles of the particular blade , and wherein for each of the plurality of pitch angles, the method comprises: calculating a mean operating condition of the wind turbine for each of a plurality of time intervals within the predetermined period using the sensor output data; and, selecting a particular one of the time intervals in which the mean operating condition is within a predetermined tolerance, wherein the corrected pitch reference is determined based on the sensor output data of the selected particular time interval for each of the plurality of pitch angles, further wherein the method is repeated to determine corrected pitch reference for each of the plurality of rotor blades , and wherein the method is performed successively for each of the rotor blades until the corrected pitch reference for each of the blades converges to within a prescribed tolerance. receiving sensor output data from one or more wind turbine sensors , the sensor output data including data indicative of excitation of the tower for a plurality of different pitch angles of a particular one of the blades , wherein the received sensor output data corresponds to a pitch angle of the remaining blades being constant; determining a corrected pitch reference of the particular blade , the corrected pitch reference corresponding to a minimum tower excitation based on the received sensor output data; and, sending the corrected pitch reference to a pitch actuator system of the particular blade , wherein the wind turbine is operated at each of the plurality of pitch angles of the particular blade for a predetermined period to receive the sensor output data for the plurality of different pitch angles of the particular blade , and wherein for each of the plurality of pitch angles, the method comprises: calculating a mean operating condition of the wind turbine for each of a plurality of time intervals within the predetermined period using the sensor output data; and, selecting a particular one of the time intervals in which the mean operating condition is within a predetermined tolerance, calculating a mean operating condition of the wind turbine for each of a plurality of time intervals within the predetermined period using the sensor output data; and, selecting a particular one of the time intervals in which the mean operating condition is within a predetermined tolerance, wherein the corrected pitch reference is determined based on the sensor output data of the selected particular time interval for each of the plurality of pitch angles, further wherein the method is repeated to determine corrected pitch reference for each of the plurality of rotor blades , and wherein the method is performed successively for each of the rotor blades until the corrected pitch reference for each of the blades converges to within a prescribed tolerance. <EOS>