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Altimeter — Manual
6.3 Altitude Derivative
pressure at sea level, p
= 226.321 hPa is standard pressure at thropo-
1
sphere/thropopause limit, z1 = 11000 m is geopotential altitude of the limit,
T
= 288.15 K is temperature at sea level, T
= 216.65 K is temperature at
0
1
limit and T
=
0.0065 K/m is temperature gradient in throposphere.
0
Besides the equations given below, their inverse and derivatives of inverse are
also used.
6.3
Altitude Derivative
Altitude calculated from pressure is numerically derived to get rate of altitude
change – vertical speed. The derivative is mathematically correct and as
such does not introduce any error. We are using multiple point numerical
derivation.
© Kanardia 2015-2020
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