📄 ilstest.htm

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      FDC help: ILStest
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    <h2>
      The radio-navigation subsystem <i>ILStest</i>
    </h2>
    <p>The masked subsystem block <i>ILStest</i>, from the ILS sublibrary of the
    block-library <i><a href="navlib.htm">NAVLIB</a></i>, is called from within
    the masked Simulink block ILS, in order to check whether or not the
    localizer and glideslope signals are valid at the current aircraft
    position. The block ILStest is called from within the block <i><a href=
    "ils.htm">ILS (Nominal ILS values)</a></i>. See the <a href=
    "#References">references</a> for more information about <i>ILStest</i>. </p>
    <h3>
      Inputvector: <i>utst</i>
    </h3>
<pre>
  utst = [Gamma_loc Gamma_gs Rloc Rgs]&#39;

  Gamma_loc: 2D-angle between line from c.g. of aircraft to lo-
             calizer antenna and runway center-line (as seen from
             above), [rad]
  Gamma_gs : 2D-angle between line from c.g. of aircraft to
             glideslope antenna and runway center-line (as seen
             from above), [rad]
  Rloc     : 2D-distance from aircraft&#39;s c.g. to localizer antenna
             (as seen from above), [m]
  Rgs      : 2D-distance from aircraft&#39;s c.g. to glideslope anten-
             na (as seen from above), [m]
</pre>
    <h3>
      Outputvector: <i>yils4</i>
    </h3>
<pre>
  yils4 = [LOCflag GSflag]&#39;.
</pre>
    <p><b>Note:</b> <i>GSflag = 0</i> if aircraft is in area where glideslope
    signals can be received with appropriate accuracy; <i>LOCflag = 0</i> if
    the aircraft flies in area where the localizer signals are receivable. If
    the aircraft is too far away, <i>GSflag</i> and/or <i>LOCflag</i> are set
    to 1.</p> 
    <h3>
      <a name="References">References</a>
    </h3>
    <p>Apart from the FDC user-manual, the following reference contains more information about the ILS signals:</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>, part I:
        <i>Implementation of a model library in Simulink</i>. Delft University
        of Technology, September 1993
      </li>
    </ol>
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