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Altimeter is a measurement system that is used to determine the altitude of a flying vehicle. It provides the aircraft pilot, navigator and other aerospace users with the altitude information, either in analog or digital readout. This information is a very important parameter for aerospace users during flight in order to achieve safe and efficient flight operation. Therefore, using an accurate method for altitude measurement is essential. The altimeter system may subject to many sources of errors (methodical, systematic and dynamic) during operation, due to the integration of aircraft instrument system, the altitude information should be accurate more than ever before, and so as to provide the actual altitude to other integrated systems. Thus a new digital altimeter is significant and much needed for this reason, to enhance the old conventional system. This paper focuses on diagnosing of conventional altimeter errors and expresses in mathematical derivations, compensate these deviations of the system output using a suitable algorithm and reduce the mechanical parts of the old system. A conceptual design of the digital altimeter has been introduced and implemented as a virtual instrument model using a computer program so as to measure and monitor the performance of the system. Air data acquisition and display system have been designed to process the data coming from a barometric sensor and display the actual altitude information in a digital readout. In addition to that, the concept of the altitude alert system has been carefully considered to alert the pilot when reaching a maximum cruising altitude.

Nasreldeen Ali Adam, Moutaman Mirghani Dafalla . (2017) Design of Altitude Measurement System for Aerospace Applications (Digital Barometric Altimeter), Journal of Space Technology , Volume 7, Issue 1.
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