This article presents an overview on passive drone detection. An SDR-based, portable universal software radio peripheral (USRP) prototype is developed for detection in two scenarios. In the scenario in which a drone communicates with the ground controller, the cyclostationarity signature of the drone signal and pseudo Doppler principle are employed. For the scenario in which a drone is not sending any signal, a micro Doppler signature generated by the RF signal is exploited for detection and identification.
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Fu et al. (2018) studied this question.