Research on Modeling and Simulation Analysis of Flapping-Wing Motion Based on Laser Micro-Doppler

In recent years, flapping-wing unmanned aerial vehicles (UAVs) inspired by the flight skills of insects and birds have developed rapidly and become a new hotspot in the field of UAV attack and defense. At present, the research on the detection and identification of flapping-wing UAVs has not been fully carried out. According to the characteristics of lidar radar and the form of flapping-wing motion, this article establishes a rectangular-triangular composite scatter model. The motion echo signals under different radar azimuths and different flapping-wing parameters are obtained by simulation, and the short-time Fourier transform is performed on them. The influence of radar azimuth and flapping-wing parameters on the time-frequency characteristics of flapping-wing motion is deeply discussed. The results show that when the azimuth angle ranges from 30° to 80° and the pitch angle ranges from 20° to 80°, the absolute error of flapping-wing angle estimation is less than 11°, the absolute error of flapping-wing length estimation is less than 10cm, and the relative error of parameter relationship is less than 11% when the signal to noise ratio (SNR) is 10. The research results show that the lidar micro-Doppler system has good detection and identification capabilities for flapping-wing UAVs, and has good system compatibility with existing optoelectronic imaging detection, and has broad application space in the future.