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In this paper, to detect and manage Unmanned Aerial Vehicles (UAVs), a passive radar array system is discussed to receive and process the Orthogonal Frequency Division Multiplexing (OFDM) echoes of UAV, which are originally transmitted by the nearby base stations. A uniform circular array is employed to receive the echoes whose model is introduced. To handle the echoes, a signal processing subsystem including the Pulse Compressing (PC), the Digital Beam Forming (DBF), and an improved Constant False Alarm Rate (CFAR) detector is established. As a result of exploiting CFAR and an additional judgement part based on target velocities, UAVs can be obtained and distinguished from other flying objects.
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Yang et al. (2016) studied this question.