Perturbation Amplitude Effects of Power Law Errors on Refraction Autofocus

Recent analyses have yielded non-parametric techniques that perform automatic compensation of defocusing effects in synthetic aperture radar (SAR) imagery, which arise from atmospheric refraction of the radar waveforms. The temporal variation of the delay and bending arising from atmospheric refraction can be modeled using power-law spectra. The present study investigates the effects of applying different values of the perturbation amplitude of the refraction-induced fluctuations. This investigation reveals that the subject refraction-based autofocus techniques give sharp scene refocus when applied to measured Ku-band SAR image data for various values of the perturbation amplitude of the modeled power law spectra.