Method for determining the average wind speed in a vertical plane by means of a LiDAR sensor mounted on a wind turbine, characterized in that the following steps are implemented: a. a model of said LiDAR measurements (MOD M) is constructed, said model of said LiDAR measurements (MOD M) being expressed as: m j,x ( k) = a j v j, x ( k) + b j v j,y ( k) + c j v j,z ( k) with m the measurement, x the longitudinal direction, j a measurement beam from said LiDAR sensor, m j,x the measurement on the measurement beam j at the distance x, k the discrete time, v the wind speed, v j,x the longitudinal component of the wind speed for the measurement beam j, v j,y the transverse component of the wind speed for the measurement beam j, v j,z the vertical component of the wind speed for the measurement beam j, a j, b j, c j constant measurement coefficients for the measurement beam j; b. a model of the wind (MOD V) is constructed taking into account the spatial consistency and the temporal consistency of the wind speed, said spatial consistency of said wind model is a function of a transverse consistency, of a vertical consistency, and of a longitudinal consistency and said temporal consistency of said wind model is expressed as: w ( k) = A s w ( k - 1) with k the discrete time, ω a vector which first of all comprises the longitudinal components of the wind speed at n predefined estimation points, then the transverse components of the wind speed for said n predefined estimation points, A s is a constant matrix which is the function of self-correlation of the wind speed obtained by a Kaimal spectrum or, for the temporal consistency, a Von Karman spectrum is implemented; c. the amplitude and the direction of the wind is measured, by means of said LiDAR sensor, in at least one measurement plane remote from said wind turbine in several measurement beams (b1, b2, b3, b4); d. the wind speed is determined at different predefined estimation points of the space upstream of the wind turbine by means of an adaptive Kalman filter which implements said model of said LiDAR measurements (MOD M), said wind model (MOD V), and said measurements; and e. the average wind speed (RAWS) is determined in said vertical plane at a distance from said wind turbine by means of said wind speeds determined for said different predefined estimation points belonging to said vertical plane considered by the average of the longitudinal components of the wind speed of the points belonging to said vertical plane. a. a model of said LiDAR measurements (MOD M) is constructed, said model of said LiDAR measurements (MOD M) being expressed as: m j,x ( k) = a j v j, x ( k) + b j v j,y ( k) + c j v j,z ( k) with m the measurement, x the longitudinal direction, j a measurement beam from said LiDAR sensor, m j,x the measurement on the measurement beam j at the distance x, k the discrete time, v the wind speed, v j,x the longitudinal component of the wind speed for the measurement beam j, v j,y the transverse component of the wind speed for the measurement beam j, v j,z the vertical component of the wind speed for the measurement beam j, a j, b j, c j constant measurement coefficients for the measurement beam j; b. a model of the wind (MOD V) is constructed taking into account the spatial consistency and the temporal consistency of the wind speed, said spatial consistency of said wind model is a function of a transverse consistency, of a vertical consistency, and of a longitudinal consistency and said temporal consistency of said wind model is expressed as: w ( k) = A s w ( k - 1) with k the discrete time, ω a vector which first of all comprises the longitudinal components of the wind speed at n predefined estimation points, then the transverse components of the wind speed for said n predefined estimation points, A s is a constant matrix which is the function of self-correlation of the wind speed obtained by a Kaimal spectrum or, for the temporal consistency, a Von Karman spectrum is implemented; c. the amplitude and the direction of the wind is measured, by means of said LiDAR sensor, in at least one measurement plane remote from said wind turbine in several measurement beams (b1, b2, b3, b4); d. the wind speed is determined at different predefined estimation points of the space upstream of the wind turbine by means of an adaptive Kalman filter which implements said model of said LiDAR measurements (MOD M), said wind model (MOD V), and said measurements; and e. the average wind speed (RAWS) is determined in said vertical plane at a distance from said wind turbine by means of said wind speeds determined for said different predefined estimation points belonging to said vertical plane considered by the average of the longitudinal components of the wind speed of the points belonging to said vertical plane.