Figure 1: Longitudinal Autopilot Configuration.
The aircraft model is a 5-state model, the state variables being the aerodynamic
speed (m/s), the climb angle (rad), the angle of attack (rad), the pitch rate (rad/s),
and the altitude (m). The elevator deflection (rad) is used to control the vertical load
factor. The open-loop dynamics include the oscillation with frequency and damping
ratio = 1.7 (rad/s) and = 0.33, the phugoid mode = 0.64 (rad/s) and = 0.06, and
the slow altitude mode = -0.0026.
load ConcordeData G
bode(G,{1e-3,1e2}), grid
title('Aircraft Model')
Fixed-Structure Autopilot for a Passenger Jet