📄 locerr.htm
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FDC help: LOCerr
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<h2>
The radio-navigation subsystem <i>LOCerr</i>
</h2>
<p>The masked subsystem block <i>LOCerr</i> (<i>Localizer steady-state
errors</i>), which is contained in the ILS-sublibrary of the blocklibrary
<i><a href="navlib.htm">NAVLIB</a></i>, computes the steady-state error
in the localizer signal caused by the ground equipment. The magnitude of
the error is computed according to ICAO guidelines. Both localizer
misalignment and steady-state errors in the localizer sensitivity can be
taken into account. See the <a href="#References">references</a> below for
more info about the theoretical backgrounds.</p>
<p>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="locnoise.htm">LOCnoise</a></i>, and the example system <i><a
href="ilsxmpl.htm">ILS example</a></i>.</p>
<h3>
Inputsignal
</h3>
Nominal value of localizer current <i>i<sub>loc</sub></i>, [micro-Ampere]
<h3>
Outputsignal
</h3>
Localizer current <i>i<sub>loc</sub></i>, including steady-state errors,
[micro-Ampere]
<h3>
Block-parameters
</h3>
<ul>
<li>
performance category (1, 2, or 3, see the FDC user-manual or <a href="#References">ref.[1]</a> for more info)
</li>
<li>
percentage of maximum allowable error in localizer sensitivity
(<i>i<sub>loc</sub> = S<sub>loc</sub> * Gamma_loc</i>, where
<i>i<sub>loc</sub></i> is localizer current through cockpit instrument,
<i>Gamma_loc</i> is the angle between the line from projection of
aircraft's c.g. on ground to localizer antenna and runway
centerline, <i>S<sub>loc</sub></i> is the localizer sensitivity)
</li>
<li>
percentage of maximum allowable localizer misalignment
</li>
<li>
distance from runway threshold to localizer antenna, [<i>m</i>]
</li>
</ul>
The block-parameters can be specified in dialog-boxes which appear after
double-clicking the block <i>LOCerr</i>.
<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>
</ol>
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