Atmosph computes some atmospheric properties, using the ICAO Standard Atmosphere model (see for instance ref.[1]). The block also computes the acceleration of gravity and the dynamic coefficient of viscosity. The block Atmosph is contained in the subsystem Airdata Group of the Beaver model. Other airdata (-related) variables are computed in the blocks Airdata1, Airdata2, and Airdata3, which also contained in the subsystem Airdata Group.
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 Atmosph have been displayed between curly braces.
yatm = [rho ps T mu g]', (atmospheric properties) rho : airdensity [kg/m^3] ps : static pressure [N/m^2] T : temperature [K] mu : dynamic viscosity [kg/(m*s)] g : acceleration of gravity [m/s^2]