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access icon free Comparison of micro-Doppler signatures registered using RBM of helicopters and WSM of vehicles

© The Institution of Engineering and Technology
Received 03/05/2019, Accepted 28/06/2019, Revised 26/06/2019, Published 01/07/2019

Jet engine modulation (JEM) are micro-Doppler features obtained from the radar data of aircraft, including jet aircraft and helicopters, and generally viewed as unique phenomenon suitable for identifying aerial targets. The authors demonstrate however, that JEM are not unique, and that the rotating wheel spokes on the wheels of ground vehicles produce a modulation similar to the rotating rotor blades of jet engines and helicopter rotor blades. They also develop a mathematical model to analyse the radar signal scattering mechanism of wheel spokes, and also employ a Ku-band Doppler radar system to collect radar echoes from a wheeled vehicle and a helicopter. Both the theoretical and experimental results verify the existence of rotor blade modulation (RBM) phenomena from helicopters and wheel spoke modulation (WSM) phenomena from vehicles. Both RBM and WSM are similar to JEM features. This fact indicates that JEM is a necessary but insufficient condition for the identification of aerial targets, and additional recognition features inherent in surface surveillance radar are needed to distinguish the JEM spectra arising from aerial targets and ground vehicles.

Inspec keywords: wheels; Doppler radar; search radar; rotors (mechanical); electromagnetic wave scattering; blades; jet engines; radar signal processing; radar cross-sections; helicopters

Other keywords: radar echoes; jet aircraft; microDoppler signatures; recognition features; JEM spectra; aerial targets; radar signal; surface surveillance radar; rotating wheel spokes; experimental results; Ku-band Doppler radar system; wheeled vehicle; JEM features; ground vehicles; rotating rotor blades; rotor blade modulation phenomena; theoretical results; WSM; helicopter rotor blades; microDoppler features; jet engine modulation; mathematical model

Subjects: Signal processing and detection; Engines; Mechanical components; Radar equipment, systems and applications; Electromagnetic wave propagation

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