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FDC help: Blocklibrary NAVLIB
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<h2>
The blocklibrary <i>NAVLIB</i>
</h2>
<p>The FDC blocklibrary <i>NAVLIB</i> contains radio-navigation blocks for
Simulink. Currently, there are two sublibraries, one for ILS signals and
one for VOR signals. ILS stands for <i>Instrument Landing System</i>; VOR
means 'Very high frequency Omnidirectional Range'. If desired, this library could be
enhanced with other radio-navigation blocks, such as Global Positioning
System. A detailed theoretical description about these simulation models
can be found in the <a href="#References">references</a> at the end of this
page.</p>
<p>The ILS sublibrary contains the following blocks: </p>
<ul>
<li>
<i><a href="ils.htm">ILS (Nominal ILS signals)</a></i><br>
ILS signals without noise and/or
steady-state errors
</li>
<li>
<i><a href="gserr.htm">GSerr</a></i><br>
Glideslope steady-state errors according
to ICAO guidelines
</li>
<li>
<i><a href="gsnoise.htm">GSnoise1</a></i><br>
Glideslope noise according to AGARD R-632
(<a href="#References">ref.[2]</a>)
</li>
<li>
<i><a href="gsnoise.htm">GSnoise2</a></i><br>
Glideslope noise according to NASA
CR-2022 (<a href="#References">ref.[3]</a>)
</li>
<li>
<i><a href="locerr.htm">LOCerr</a></i><br>
Localizer steady-state errors according
to ICAO guidelines
</li>
<li>
<i><a href="locnoise.htm">LOCnoise1</a></i><br>
Localizer noise according to AGARD R-632
(<a href="#References">ref.[2]</a>)
</li>
<li>
<i><a href="locnoise.htm">LOCnoise2</a></i><br>
Localizer noise according to NASA
CR-2022 (<a href="#References">ref.[3]</a>)
</li>
<li>
<i><a href="ilsxmpl.htm">ILS example</a></i><br>
Example system which demonstrates the
practical use of the other ILS blocks
</li>
</ul>
<p>The VOR sublibrary contains the following blocks:</p>
<ul>
<li>
<i><a href="vor.htm">VOR (Nominal VOR signals)</a></i><br>
VOR signals without error components
</li>
<li>
<i><a href="vorerr.htm">VORerr</a></i><br>
Steady-state error for the VOR signal
</li>
<li>
<i><a href="vorxmpl.htm">VOR example</a></i><br>
Example system which demonstrates the
practical use of the other VOR blocks
</li>
</ul>
<p><b>Note:</b> currently there are no accurate noise models available for the
VOR blocks. Should such models become available, they can easily be
included in the VOR sublibrary of <i>NAVLIB</i>.</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 'Beaver'</i>, part I:
<i>Implementation of a model library in Simulink</i>. Delft University
of Technology, September 1993 (also contained in the STAR database of
NASA, report number NONP-NASA-SUPPL-DK-94-28027)
</li>
<li>
Anon.: <i>Approach and Landing Simulation</i>. AGARD report 632, Ames,
1975
</li>
<li>
Johnson, W.A., McRuer, D.T.: <i>Development of a Category II Approach
System Model</i>. NASA Contractor Report 2022, Washington D.C., USA,
1972
</li>
</ol>
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