Abstract
Micro-motion modulation caused by multi-rotor can be used as an important feature to identify different types of multi-rotor aircrafts. In this paper, modeling and systematical research on micro-motion modulation characteristics of multi-rotor aircraft's rotors is studied. Firstly, the mathematic model of multi-rotor aircraft's rotors is proposed. Secondly, time-domain characteristics and micro-Doppler (m-D) signature of rotors are analyzed based on this model. Finally, the micro-motion modulation characteristics of various multi-rotor aircraft's rotors, which are compared with that of single-rotor, are simulated and studied. Simulation results show that there is a clear distinction of the m-D signatures among different types of multi-rotor aircraft's rotors, which can provide a theoretical basis for the classification of multi-rotor aircrafts.
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