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Rotor blade parameter estimation with multichannel passive radar

This chapter is dedicated to the radar measurements of rotary -wing aircraft parameters. It concerns primarily helicopters as targets; however, the considerations presented herein are also valid, at least in part, for a wider class of aircraft, including multicopter drones. The chapter focuses mainly on blade echo detection and the estimation of blade parameters, as the presence of a rotor with moving blades is a common distinguishing feature specific for this class of targets.