Article

Surveillance UAVs in a Bat’s World (en)

* Presenting author
Day / Time: 08.03.2023, 18:20-18:40
Room: Saal Y9
Typ: Vortrag (strukturierte Sitzung)
Abstract: The goal of this study is to monitor the number and type of bats located in a specific, hard-to-reach area, without disturbing their natural flight behaviour. This can be achieved by acoustic monitoring of the bat’s ultrasonic echoes. By attaching an acoustic sensor to an unmanned aerial vehicle (UAV), a large area can be covered. However, it has been shown that bats may be either attracted or deterred by UAVs. What specifically is causing this effect is still unclear. Our hypothesis is that the bats can hear the UAV’s “whining”. We measure the sound level of drone drivetrains up to 100 kHz in the laboratory and apply an environmental damping model of sound. Our findings suggest that dedicated species of gleaning bats can still hear much of the UAV noises, whereas the “non-gleaning” bats are less affected. We further researched, which parameters have the most influence on the emitted noise by varying the type of Electronic Speed Controller (ESC), motor, and diameter of propeller blades. An optimum drone drivetrain setup for further in-situ investigations is presented in this paper.
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