Simulation and parameter extraction of flying‐bird motion echo based on laser micro‐Doppler effect

Abstract

AbstractTo solve the problem of target recognition for flying‐birds and biomimetic flapping‐wing unmanned aerial vehicles (UAVs), a rectangular‐trapezoidal composite scattering model for lidar detection of bird wings has been proposed and established. According to the model, the influence of different line‐of‐sight angles on the time–frequency distribution characteristics of laser micro‐Doppler under the same flapping wing motion was simulated and studied. Then, the flapping‐wing frequency and maximum frequency shift are extracted based on the two‐dimensional Fourier transform and the least squares method. When signal noise ratio = 5 dB, the accuracy rate of flapping‐wing frequency extraction can reach at 100%, the maximum relative error of frequency shift for inner contour extraction is less than 3.0%, and the maximum relative error of frequency shift for outer contour extraction is less than 7.2%.