📄 airdata1.htm
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<TITLE>FDC help: Airdata1</TITLE>
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<H2>Subsystem <I><FONT FACE="Arial","Helvetica","Sans Serif">Airdata1</FONT></I></H2>
<I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Airdata1</FONT></I> is a masked S<SMALL>IMULINK</SMALL> subsystem, used to compute the speed of sound <I>a</I>, the Mach number <I>M</I>, and the dynamic pressure <I>qdyn</I>. The block <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Airdata1</FONT></I> is contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="adgrp.htm">Airdata Group</A></FONT></I> of the system <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="beaver.htm">Beaver</A></FONT></I>. Other airdata
(-related) variables are computed in the blocks <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="atmosph.htm">Atmosph</A></FONT></I>, <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="airdata2.htm">Airdata2</A></FONT></I>, and <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><A HREF="airdata3.htm">Airdata3</A></FONT></I>, which also contained in the subsystem <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif"><I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Airdata Group</FONT></I></FONT></I>.
<H3>Inputvectors: <I>x</I> and <I>yatm</I>
</H3>
<PRE> x = [V alpha beta p q r psi theta phi xe ye H]' (states)
yatm = [rho ps T mu g]' (atmospheric properties, computed in
the block <A HREF="atmosph.htm">Atmosph</A>)
V : airspeed [m/s]
{alpha: angle of attack [rad] }
{beta : sideslip angle [rad] }
{p : roll rate [rad/s] }
{q : pitch rate [rad/s] }
{r : yaw rate [rad/s] }
{psi : yaw angle [rad] }
{theta: pitch angle [rad] }
{phi : roll angle [rad] }
{xe : x-coordinate in Earth-fixed reference frame [m] }
{ye : y-coordinate '' '' '' '' [m] }
{H : altitude above sea-level [m] }
rho : airdensity [kg/m^3]
{ps : static pressure [N/m^2] }
T : temperature [K]
{mu : dynamic viscosity [kg/(m*s)] }
{g : acceleration of gravity [m/s^2] }
</PRE>
The inputvariables which are not actually used by <I><FONT SIZE=2 FACE="Arial","Helvetica","Sans Serif">Airdata1</FONT></I> have been displayed between accolades.
<H3>Outputvector: <I>yad1</I>
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<PRE> yad1 = [a M qdyn]'
a : speed of sound [m/s]
M : Mach number [-]
qdyn : dynamic pressure [N/m^2]
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