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The measure system is based on the principle of evaluating the change of an atmospheric pressure. The vertical velocity is derived from the exponential form of the barometric equation which relates the air pressure versus the altitude. The relatively simple method has some drawbacks (a nonlinearity of the exponential dependency of the pressure versus altitude, the air temperature plays a significant role). There are used the compensated methods for measuring the vertical velocity. The correction is calculated from the horizontal velocity change which induces another vertical velocity change. The solution is based on the altitude equation, including the effects of temperature. The acceleration is evaluated in the horizontal direction using the information about the dynamic pressure. The possibility of nonlinearity compensation and temperature compensation are used.
Date of Conference: 25-27 Oct. 2010