Abstract
In present study we present some results on the measurement of the ground speed of an aircraft using noise parameters measured on the ground level, including sound levels, sound pressure levels, and Doppler frequency translations of the spectral components of equal-sound pressure levels. It is shown that attempts to determine aircraft speed from the maximum values of the sound level or sound pressure level measured at different points leads to a relatively large error (more than 200%). On the other hand, the error in determining aircraft speed from measurements of the Doppler frequency translation of spectral components of equal-sound pressure levels at one point on the ground is less than 10%. In order to reduce the error in determining the speed of an aircraft, it is necessary to consider the interference from direct and reflected sound waves from the earth’s surface, as well as changes in the sound propagation speed of an aircraft and it’s dependence on the aircraft altitude. When measurements are performed at three points this method correctly determines the ground speed and spatial position of an aircraft. Our approach fills in the gaps in the initial data, which is necessary, in particular, for calculating sanitary protection zones of airfields accommodating for aircrafts with unknown noise characteristics.
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Translated by A. Muravnik
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Drozdov, S.V., Dragan, S.P., Bogomolov, A.V. et al. A Method to Determine Aircraft Speed from Ground Acoustic Measurements. Moscow Univ. Phys. 75, 459–464 (2020). https://doi.org/10.3103/S0027134920050082
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DOI: https://doi.org/10.3103/S0027134920050082