📄 locnoise.htm
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FDC help: LOCnoise
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<h2>
The radio-navigation subsystem <i>LOCnoise</i>
</h2>
<p>The sublibrary <i>ILS</i> of the library <i><a href=
"navlib.htm">NAVLIB</a></i> contains two different masked subsystem blocks
which implement localizer noise signals: <i>LOCnoise1</i> and
<i>LOCnoise2</i>. See the <a href="#References">references</a> below for
more details about the theoretical backgrounds. <br>
<br>
Other blocks in the <i>ILS</i> sublibrary of <i>NAVLIB</i> are: <i><a
href="ils.htm">Nominal ILS signals</a></i>, <i><a href=
"gserr.htm">GSerr</a></i>, <i><a href="gsnoise.htm">GSnoise</a></i>, and
<i><a href="locerr.htm">LOCerr</a></i>, and the example system <i><a href=
"ilsxmpl.htm">ILS example</a></i>.</p>
<h3>
<i>LOCnoise1</i>
</h3>
<p>This block generates localizer noise according to AGARD R-632 (<a href=
"#References">ref.[2]</a>), assuming a constant approach speed. The user
must specify the scale length <i>L<sub>loc</sub></i> (typically 130
<i>m</i>), the standard deviation <i>sigma_loc</i> (usually <= 15
micro-Ampere), and the approach speed <i>V</i>.</p>
<p><i>LOCnoise1</i> doesn't have any inputs.<br>
Outputsignal: Localizer-noise [micro-Ampere]</p>
<h3>
<i>LOCnoise2</i>
</h3>
<p>This block uses a localizer noise filter according to NASA CR-2022 (<a
href="#References">ref.[3]</a>). The user doesn't have to specify any
parameters.</p>
<p><i>LOCnoise2</i> doesn't have any inputs.<br>
Outputsignal: Localizer-noise [micro-Ampere]</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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