Deviation analysis of pulse compression in ISAR imaging based on direct intermediate frequency sampling data

Deviation in ISAR images is inevitable, especially for the phase part. Pulse compression is the key process in ISAR Imaging, which is also the source of deviation. Focusing on direct intermediate frequency sampling data obtained from LFM (linear frequency modulation) signal, this paper carefully analyzes the process of matched filtering, the source of deviation in HRRP (high resolution range profile), and proposed several compensation methods in alleviating deviation caused by high speed movement and discrete sampling. Simulation results prove the rationality of deviation analysis and the validity of compensation methods.