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Activity monitoring of bats in a laboratory flight tunnel using a 24 GHz FMCW radar system

Radar techniques have been used recently to monitor bats when they are hunting close to wind energy plants. However, the real-time detection of bats is a challenge and activity metrics must be defined that enable a robust bat detection. In this paper we report on FMCW radar measurements at 24 GHz of Seba's short-tailed fruit bats (Carollia perspicillata) in a laboratory flight tunnel. Experiments have been performed with a single flying bat and multiple simultaneously flying bats. We introduce several activity metrics and discuss their properties. Further signal processing results, such as Range-Doppler maps, will be presented and discussed.