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This letter proposes to use an ultra-wideband (UWB) radar for drone detection and experimentally investigates feasibility of the proposal. First, the radar cross section (RCS) of a typical quadrotor drone is clarified. Next, radar range profiles of a flying drone are discussed. As a result, we have confirmed that an UWB radar with high range resolution can detect a drone and observed a unique feature of the echoes reflected from the drone's rotor blades. The feature will enable us to distinguish a drone from other flying objects. Keywords: ultra-wideband, radar, drone, RCS, measurement Classification: Sensing References[1] A. Restas, "Drone applications for supporting disaster management," World J.

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