A Motion Compensation Algorithm in Frequency Domain for Wide-beam Airborne SAR
一种宽波束机载SAR运动误差的频域补偿方法

Motion Compensation is essential for wide-beam airborne Synthetic Aperture Radar (SAR). This paper proposes a motion compensation algorithm for wide-beam airborne SAR based on phase correcting in frequency domain for azimuth blocks. With the relationship between time and frequency of chirp signal, residual errors in time domain are mapped into frequency domain and compensated. Short Fourier Transforms are used to gain high efficiency. This paper analyzes the principle, limitations, processing steps and efficiency of the algorithm. Simulation of point target and images of a P band airborne SAR with low-frequency motion errors validates the proposed algorithm.