%% $Date: 2012-07-06 17:42:54#$
%% $Revision: 149 $
\index{pressure\_angle\_incidence\_cnrm}
\algdesc{Pressure and angle of incidence (CNRM)}
{ %%%%%% Algorithm name %%%%%%
pressure\_angle\_incidence\_cnrm
}
{ %%%%%% Algorithm summary %%%%%%
Calculates static pressure and dynamic pressure by correction of static error. Angle of attack and sideslip are calculated from the horizontal and vertical differential pressures.
}
{ %%%%%% Category %%%%%%
Thermodynamics
}
{ %%%%%% Inputs %%%%%%
$P_{sr}$ & Vector & Raw static pressure [hPa] \\
$\Delta P_r$ & Vector & Raw dynamic pressure [hPa] \\
$\Delta P_h$ & Vector & Horizontal differential pressure [hPa] \\
$\Delta P_v$ & Vector & Vertical differential pressure [hPa] \\
$C_\alpha$ & Coeff.[2] & Angle of attack calibration coefficients \\
$C_\beta$ & Coeff.[2] & Slip calibration coefficients \\
$C_{errstat}$ & Coeff.[4] & Static error coefficients 
}
{ %%%%%% Outputs %%%%%%
$P_s$ & Vector & Static Pressure [hPa] \\
$\Delta P$ & Vector & Dynamic pressure corrected with static error [hPa] \\
$\alpha$ & Vector & Angle of attack [rad] \\
$\beta$ & Vector & Sideslip [rad] 
}
{ %%%%%% Formula %%%%%%
If $\Delta P_r > 25$hPa:
\begin{displaymath}
 Errstat = C_{errstat}[0] + C_{errstat}[1] \Delta P_r + C_{errstat}[2] \Delta P_r^2 + C_{errstat}[3] \Delta P_r^3
\end{displaymath}
%
otherwise:
\begin{eqnarray}
 Errstat = \frac{\Delta P_r}{25} \textrm{ Errstat @ 25 hPa} \\ \nonumber
 P_s = P_{sr} - Errstat \\ \nonumber
 \Delta P = \Delta P_r + Errstat \\ \nonumber
 \alpha = C_\alpha [0] + C_\alpha [1] \frac{\Delta P_v}{\Delta P} \\ \nonumber
 \beta = C_\beta [0] + C_\beta [1] \frac{\Delta P_h}{\Delta P} \nonumber
\end{eqnarray}
}
{ %%%%%% Author %%%%%%
CNRM/GMEI/TRAMM
}
{ %%%%%% References %%%%%% 

}


