GPS辅助的FMCWSAR成像运动补偿

GPS-aided Motion Compensation of FMCW SAR Imaging

针对小型无人机装载FMCW SAR脉内运动误差较大的情况,提出GPS数据辅助的SAR成像运动补偿方法。运用新的补偿函数对全成像场景分步骤补偿航迹法平面运动误差,采用非均匀的离散傅里叶变换校正航迹前向速度误差,从而正确补偿三维方向的运动误差,实现一定分辨力要求下的成像。仿真证明了方法有效性。

There is a large in-pulse motion error when transmitting longer period pulses for FMCW SAR system loaded on small-UAV platform. A novel motion error compensation method for FMCW SAR based on GPS data is proposed： using new compensation function to cut down the cross-track motion error step-by-step so that range-varying cross-track motion error of all scene target can be well removed; using nonuniform discrete fourier transform to correct the along-track motion error,and thereby three-dimensional error can be compensated at a certain resolution. Simulation proves the validity of the proposed method.