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Controversial 'spies in the sky' drones being used by councils to 'snoop on residents'

More than 60 councils across the UK now have pilots authorised to fly drones, according to the Civil Aviation Authority.
IEEE

Second-Order Characterization of Micro Doppler Radar Signatures of Drone Swarms

Abstract: We propose an analytic model for the second-order characteristics of the radar return signal from a swarm of rotor drones. We consider the case of a swarm of identical drones, with each a ...