?? sensors.htm
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FDC help: Sensors
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Autopilot model, subsystem <i>Sensors / Subtract initial conditions</i>
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<p>The autopilot subsystem <i>Sensors / Subtract initial inputs</i> contains
the dynamics of the sensor models for the 'Beaver' autopilot and it determines small-deviation signals (i.e. the difference between the outputs from the <i>Beaver</i> model and their initial values), which are needed by the control laws.</p>
<p>This subsystem is
used by the systems <i><a href="apilot.htm#APILOT2">APILOT2</a></i> and
<i><a href="apilot.htm#APILOT3">APILOT3</a></i> (<i><a href=
"apilot.htm#APILOT1">APILOT1</a></i> only contains the subtraction of the
initial conditions). The outputs from this block are sent to
the subsystems <i><a href="ap_symm.htm">Symmetrical autopilot modes</a></i>
and <i><a href="ap_asymm.htm">Asymmetrical autopilot modes</a></i>.</p>
<p>The current implementation is actually only intended to provide a
<i>framework</i> for future enhancements of the autopilot models: only a
few airdata-sensor models have actually been implemented; most 'sensor' blocks are still empty. The most
important sensor block is a quantization effect in the altitude measurement due to a
relatively large least-significant bit used in the airdata computer of the 'Beaver' autopilot.</p>
<p>The framework from this subsystem makes it very easy to add new sensormodels if required.</p>
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