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      FDC help: VOR
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    <h2>
      The radio-navigation block <i>VOR (Nominal VOR signals)</i>
    </h2>
    <p>The block <i>VOR</i>, from the VOR sublibrary of the <i><a
    href="navlib.htm">NAVLIB</a></i> block-library, calculates VOR signals
    which an aircraft receives when it flies at a certain position with respect
    to a certain user-specified reference VOR bearing. The coordinates of the
    VOR antenna, measured relatively to the Earth-bounded reference frame, must
    be defined by the user for <i>t</i> = 0. See the <a href=
    "#References">references</a> below for more information.</p>
     <p><b>Note:</b> the block VOR determines the nominal VOR signals, without
    taking into account noise and/or steady-state errors. For the latter kind
    of errors in the VOR signal, a separate block <i><a href=
    "vorerr.htm">VORerr</a></i> has been created. The system <i><a href=
    "vorxmpl.htm">VOR example</a></i> demonstrates how these blocks can be
    combined.</p> 
    <h3>
      Inputsignals: <i>uvor1</i> and <i>uvor2</i>
    </h3>
<pre>
uvor1 = [xe ye H]&#39;,
uvor2 = psi.

xe : X-coordinate of aircraft in Earth-fixed reference frame [m]
ye : Y-coordinate of aircraft in Earth-fixed reference frame [m]
H  : altitude of aircraft above sea level [m]
psi: heading of the aircraft (yaw angle) [rad]
</pre>
    <b>Note:</b> these signals are outputs from the non-linear aircraft
    dynamics model (e.g. from the <i><a href="beaver.htm">Beaver</a></i> model). 
    <h3>
      Outputsignals: <i>yvor1</i>, <i>yvor2</i>, and <i>yvor3</i>
    </h3>
<pre>
yvor1 = Gamma_VOR: Angle between chosen VOR-bearing and line
                   from aircraft&#39;s c.g. to VOR antenna [rad]
yvor2 = R_VOR    : 2D-distance from origin Earth-fixed reference
                   frame to VOR (as seen from above) [m]

yvor3 = [Cone-of-silence-flag, Range-flag]&#39;
yvor4 = ToFrom
</pre>
    <p>The Cone-of-silence-flag is set to 1 if the aircraft enters the &#39;cone
    of silence&#39;. The Range-flag is set to 1 if the aircraft flies outside
    the area where the VOR signals can be received with appropriate
    reliability.</p>
     <p>The variable <i>ToFrom</i> is set to 1 if aircraft is flying towards the
    VOR antenna or 0 if the aircraft flies away from the antenna.</p> 
    <h3>
      <a name="References">References</a>
    </h3>
    <p>For more information about the block <i>VOR</i>, consult the FDC user-manual, and/or:</p> 
    <ol>
      <li>
        M.O. Rauw: <i>A Simulink environment for Flight Dynamics and Control
        analysis - Application to the DHC-2 &#39;Beaver&#39;</i>. MSc-thesis,
        Delft University of Technology, Faculty of Aerospace Engineering,
        Delft, The Netherlands, 1993.
      </li>
    </ol>
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