Cwind is a masked Simulink system, which is used to calculate velocity components along the body-axes of the aircraft, assuming a constant wind speed and direction. If you want the wind velocity and/or direction to vary with altitude, use BLwind instead. Both Cwind and BLwind are contained in the blocklibrary WINDLIB.
The user must specify the wind velocity Vw in [m/s], the horizontal wind direction psi_w in [rad], and the vertical wind direction gamma_w, also in [rad]. Notice that psi_w should be equal to pi rad if the wind is blowing to the North and that gamma_w is positive for upward blowing wind!
x = [V alpha beta p q r psi theta phi xe ye H]' (states) {V : airspeed [m/s] } {alpha: angle of attack [rad] } {beta : sideslip angle [rad] } {p : roll rate [rad/s] } {q : pitch rate [rad/s] } {r : yaw rate [rad/s] } psi : yaw angle [rad] theta: pitch angle [rad] phi : roll angle [rad] {xe : x-coordinate in Earth-fixed reference frame [m] } {ye : y-coordinate '' '' '' '' [m] } {H : altitude above sea-level [m] }
The variables which are not actually used by Cwind have been displayed between curly braces.
ywind = [uw vw ww]' uw : wind velocity component along XB-axis [m/s] vw : wind velocity component along YB-axis [m/s] ww : wind velocity component along ZB-axis [m/s]