📄 gserr.htm
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FDC help: GSerr
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<h2>
The radio-navigation subsystem <i>GSerr</i>
</h2>
<p>The block <i>GSerr</i> (<i>Glideslope steady-state
errors</i>) is contained in the sublibrary <i>ILS</i> of the blocklibrary
<i><a href="navlib.htm">NAVLIB</a></i>. It computes the steady-state error
in the glideslope signal, caused by the ground equipment. The magnitude of
the error is computed according to ICAO guidelines. Both glideslope
misalignment and steady-state errors in the glideslope 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=
"gsnoise.htm">GSnoise</a></i>, <i><a href="locerr.htm">LOCerr</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 the glideslope current <i>i_gs</i>,
[micro-Ampere]
<h3>
Outputsignal
</h3>
Glideslope current <i>i_gs</i>, including steady-state errors,
[micro-Ampere]
<h3>
Block-parameters
</h3>
<ul>
<li>
performance category (1, 2, or 3, see the <a href="#References">References</a> for more info)
</li>
<li>
percentage of maximum allowable error in glideslope sensitivity
(<i>i_gs = S_gs * epsilon_gs</i>, where
<i>i_gs</i> is the glideslope current through the cockpit
instrument, <i>epsilon_gs</i> is the angle between the line from
aircraft's c.g. to glideslope antenna and nominal glide path, and
<i>S_gs</i> is the glideslope sensitivity)
</li>
<li>
percentage of maximum allowable glideslope misalignment
</li>
<li>
nominal glideslope elevation angle
</li>
</ul>
<p>The block-parameters can be specified in dialog-boxes which appear after
double-clicking the block <i>GSerr</i>.</p>
<h3>
<a name="References">References</a>
</h3>
<p>Apart from the FDC user-manual, the following references contain 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
</li>
<li>
Anon.: <i>Approach and Landing Simulation</i>. AGARD report 632, Ames,
1975
</li>
</ol>
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