📄 vor.htm
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<TITLE>FDC help: VOR</TITLE>
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<H2>The radio-navigation block <I><FONT FACE="Arial","Helvetica","Sans Serif">VOR (Nominal VOR signals)</FONT></I></H2>
The masked subsystem block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">VOR</FONT></I>, from the VOR sublibrary of the <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="navlib.htm">NAVLIB</A></FONT></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.<BR><BR>
<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><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="vorerr.htm">VORerr</A></FONT></I> has been created. The system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="vorxmpl.htm">VOR example</A></FONT></I> demonstrates how these blocks can be combined.
<H3>Inputsignals: <I>uvor1</I> and <I>uvor2</I></H3>
<PRE> uvor1 = [xe ye H]',
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 system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="beaver.htm">Beaver</A></FONT></I>).
<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'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]'.
yvor4 = ToFrom
</PRE>
The Cone-of-silence-flag is set to 1 if the aircraft enters the 'cone of silence'. The Range-flag is set to 1 if the aircraft flies outside the area where the VOR signals can be received with appropriate reliability.<BR><BR>
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.
<H3><A NAME= "References">References</A></H3>
For more information about the block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">VOR</FONT></I>, consult the following references:
<OL>
<LI>M.O. Rauw: <I>FDC 1.2 - A S<SMALL>IMULINK</SMALL> Environment for Flight Dynamics and Control Analysis</I>. Zeist, The Netherlands, 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>. MSc-thesis, Delft University of Technology, Faculty of Aerospace Engineering, Delft, The Netherlands, 1993.
</OL>
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