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FDC help: Reference Signals
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<h2>
Autopilot subsystem <i>Reference Signals</i>
</h2>
<p>The autopilot subsystem <i>Reference Signals</i> supplies the reference
values of the pitch angle, roll angle, altitude, rate of climb/descent, and
heading for the different autopilot modes.</p>
<p>Before starting a new simulation, double-click the block 'Select Mode
and Reference Signals', or type <code>apstart</code> 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 <i><a href="apmode.htm">APMODE</a></i> in the
vectors <i>yrefS</i> and <i>yrefA</i> in the Matlab workspace. These
vectors are defined as follows:</p>
<ul>
<li>
<i>yrefS:</i> symmetrical reference signals (pitch angle, altitude,
rate of climb/descent)
</li>
<li>
<i>yrefA:</i> asymmetrical reference signals (roll angle, heading)
</li>
</ul>
<h3>Symmetrical reference signals:</h3>
<pre>
yrefS = [Dtheta_ref, DH_ref, DHdot_ref]
</pre>
where:
<pre>
Dtheta_ref = reference pitch-angle [rad]
DH_ref = reference altitude [m]
DHdot_ref = reference rate of climb/descent [m/s]
</pre>
<h3>Asymmetrical reference signals:</h3>
<pre>
yrefA = [Dphi_ref, Dpsi_ref]
</pre>
where:
<pre>
Dphi_ref = reference roll-angle [rad]
Dpsi_ref = reference heading [rad]
</pre>
<h3>
More information
</h3>
<p>See the source-code of <small>APMODE.M</small> for more details on the mode-initialization of
the autopilot simulation models.</p>
<h3>
<a name="References">References</a>
</h3>
<p>A detailed description of the 'Beaver' autopilot can be found in the FDC user-manual, and the following references:</p>
<ol>
<li>
M.O. Rauw: <i>A Simulink environment for Flight Dynamics and Control
analysis - Application to the DHC-2 'Beaver'</i> (PART II).
MSc-thesis, Delft University of Technology, Faculty of Aerospace
Engineering, Delft, The Netherlands, 1993.
</li>
<li>
P.N.H. Wever: <i>Ontwerp en implementatie van de regelwetten van de De
Havilland DHC-2 'Beaver'</i> (in Dutch). MSc-thesis, Delft
University of Technology, Faculty of Aerospace Engineering, Delft, The
Netherlands, 1993.
</li>
</ol>
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