Micro-Doppler Effect of Ship Based on Pendulum Oscillation Model

Abstract

Effective investigation methods are urgently needed in the security field of preventing public security such as maritime smuggling and maritime military threats. In recent years, micro-Doppler features have been used for a variety of targets to extract features and detect and identify targets of interest. This paper proposes a modeling idea to simulate the micro-motion of the ship based on the micro-motion situation of the actual ship docked on the coast. Oscillating pendulums are a common example for understanding the basis of nonlinear motion dynamics. The oscillating pendulum model is used to establish a simple scattering point model of a ship floating on the sea, the micro-Doppler features of the ship model are simulated, and the micro-Doppler features are extracted by short-time Fourier transform algorithm. This model can also simulate the micro-motion of disembarking ships in different sea conditions. The simulation results give the Doppler characteristics of the scattering point model. In theory, by comparing with the measured data, it is hoped that the revised model will be applied to estimate the size of a certain dimension of the ship in the future.