Abstract
When solving the actual task of detecting an unmanned aerial vehicle (UAV) by its acoustic emission (AE), representing a potential threat to various areas of human activity, it becomes necessary to distinguish its signal from all other acoustic noises. For this purpose, considerable attention is paid in the literature to theoretical and experimental studies of the structure and parameters of sound fields generated by UAVs. The basic properties of the AE generated by aircraft propellers rotations are experimentally determined in this work. The influence of piloting conditions on the shape and characteristics of the emission spectrum is analyzed. The affection of sound attenuation in the atmosphere on the spatial spectrum variability, causing degradation of its high-frequency region, is shown. The effective AE frequency band of UAVs is studied under various conditions. Emission patterns characterizing the spatial directivity of the UAV AE are presented and analyzed.
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