The autopilot subsystem Reference Signals supplies the reference values of the pitch angle, roll angle, altitude, rate of climb/descent, and heading for the different autopilot modes.
Before starting a new simulation, double-click the block 'Select Mode
and Reference Signals', or type apstart
at the Matlab
command line in order to define the autopilot modes (and hence, the initial
switch-settings). The reference signals will be stored by the
initialization routine APMODE in the
vectors yrefS and yrefA in the Matlab workspace. These
vectors are defined as follows:
yrefS = [Dtheta_ref, DH_ref, DHdot_ref]where:
Dtheta_ref = reference pitch-angle [rad] DH_ref = reference altitude [m] DHdot_ref = reference rate of climb/descent [m/s]
yrefA = [Dphi_ref, Dpsi_ref]where:
Dphi_ref = reference roll-angle [rad] Dpsi_ref = reference heading [rad]
See the source-code of APMODE.M for more details on the mode-initialization of the autopilot simulation models.
A detailed description of the 'Beaver' autopilot can be found in the FDC user-manual, and the following references: