多旋翼无人机FMCW SAR高频振动误差补偿方法OA

Multirotor unmanned aerial vehicle(UAV)synthetic aperture radar(SAR)systems are prone to high-fre-quency vibration errors caused by rotor rotation during flight,which introduces paired false targets in the imaging results and significantly degrades image quality.To address this issue,a vibration error compensation method is proposed spe-cifically for frequency modulated continuous wave(FMCW)SAR systems equipped on multirotor UAVs.First,a high-fre-quency vibration error model and the corresponding echo signal model are established for the FMCW SAR system,and the mechanism through which such vibrations affect imaging quality is systematically analyzed.Subsequently,a compen-sation method based on complementary ensemble empirical mode decomposition(CEEMD)is proposed.Vibration com-ponents are accurately extracted using an improved CEEMD method.Then,an optimal estimation model based on the minimum mean squared error(MMSE)criterion is constructed to accurately determine the vibration parameters.Finally,a phase compensation function is constructed,and all vibration components are iteratively compensated in sequence,leading to the effective suppression of multi-component high-frequency vibration errors.The effectiveness of the pro-posed method is validated through simulations under complex motion error conditions.