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Residual Phase Errors and Autofocusing in Airborne SAR Systems
Proceedings of the 2014 Microwaves, Radar and Remote Sensing Symposium (September 23-25, 2014, Kiev, Ukraine), pp.103-106 (2014)

I.M. Gorovyi, O.O. Bezvesilniy and D.M. Vavriv

Presence of phase errors in radar data is a crucial problem for high-resolution SAR imaging. In the paper, a new idea for representation of an arbitrary phase error by its local approximations is proposed. Within such approach, a general analytical expression for the resolution degradation of multi-look SAR images is derived. The principle of local approximations is also used in a novel autofocusing approach that allows estimating and compensating of an arbitrary residual phase error function via measuring local quadratic phase errors.