Harmonic Synthetic Aperture Radar Imaging with Motion Compensation

In a harmonic synthetic aperture radar (H-SAR) image, artificial targets that contain nonlinear devices can be separated from naturally occurring clutter items since they are often linear. However, the signal-to-noise ratio (SNR) of harmonic echoes are quite low, which makes it difficult for motion compensation and imaging. In this paper, an autofocus algorithm for harmonic SAR image has been designed. The fundamental frequency signal at high power levels is used to estimate residual phase error of the platform, and the frequency modulation rate of the harmonic signal is corrected before pulse compression. Simulations have been performed and results is presented to prove their focusability and motion compensation ability.