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<TITLE>FDC help: Blocklibrary NAVLIB</TITLE>
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<H2>The blocklibrary <I><FONT FACE="Arial","Helvetica","Sans Serif">NAVLIB</FONT></I></H2>
The FDC blocklibrary <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">NAVLIB</FONT></I> contains radio-navigation blocks for S<SMALL>IMULINK</SMALL>. Currently, there are two sublibraries, one for ILS signals and one for VOR signals. ILS stands for <I>Instrument Landing System</I>; VOR means <I>Very high frequency Omnidirectional Range</I>. This library may 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 help-text.
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The ILS sublibrary contains the following blocks:
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<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="ils.htm">ILS (Nominal ILS signals)</A></FONT></I><BR>     ILS signals without noise and/or steady-state errors
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="gserr.htm">GSerr</A></FONT></I><BR>      Glideslope steady-state errors according to ICAO guidelines
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="gsnoise.htm">GSnoise1</A></FONT></I><BR>
     Glideslope noise according to AGARD R-632 (<A HREF="#References">ref.[3]</A>)
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="gsnoise.htm">GSnoise2</A></FONT></I><BR>      Glideslope noise according to NASA CR-2022 (<A HREF="#References">ref.[4]</A>)
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="locerr.htm">LOCerr</A></FONT></I><BR>      Localizer steady-state errors according to ICAO guidelines
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="locnoise.htm">LOCnoise1</A></FONT></I><BR>      Localizer noise according to AGARD R-632 (<A HREF="#References">ref.[3]</A>)
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="locnoise.htm">LOCnoise2</A></FONT></I><BR>      Localizer noise according to NASA CR-2022 (<A HREF="#References">ref.[4]</A>)
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="ilsxmpl.htm">ILS example</A></FONT></I><BR>
     Example system which demonstrates the practical use of the other ILS blocks
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The VOR sublibrary contains the following blocks:
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<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="vor.htm">VOR (Nominal VOR signals)</A></FONT></I><BR>
     VOR signals without error components
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="vorerr.htm">VORerr</A></FONT></I><BR>
     Steady-state error for the VOR signal
<LI><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="vorxmpl.htm">VOR example</A></FONT></I><BR>
     Example system which demonstrates the practical use of the other VOR blocks
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<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><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">NAVLIB</FONT></I>.
<H3><A NAME= "References">References</A></H3>
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<LI>M.O. Rauw: <I>FDC 1.2 - A S<SMALL>IMULINK</SMALL> Environment for Flight Dynamics and Control Analysis</I>. Zeist, March 1997
<LI>M.O. Rauw: <I>A S<SMALL>IMULINK</SMALL> environment for Flight Dynamics and Control analysis - Application to the DHC-2 'Beaver'</I>, part I: <I>Implementation of a model library in S<SMALL>IMULINK</SMALL></I>. Delft University of Technology, September 1993 (also contained in the STAR database of NASA, report number NONP-NASA-SUPPL-DK-94-28027)
<LI>Anon.: <I>Approach and Landing Simulation</I>. AGARD report 632, Ames, 1975
<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
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