Analysis of SAR Image Formation Equations for Stationary and Moving Targets.

摘要

This report presents a detailed mathematical analysis of backprojection and 'omega-k' (range migration) image formation equations for synthetic aperture radar (SAR). The image processor transfer function is computed for both stationary and moving targets, including antenna and target pattern effects. Assuming straight-line platform motion, it is demonstrated that both image formation algorithms provide exact focusing of stationary targets. Moving targets are displaced to false locations and blurred into elliptic or hyperbolic curves. Algorithms are suggested which will exactly refocus moving targets in SAR images based on only one unknown motion parameter. All results are derived without narrow-band, narrow-angle, or narrow-swath assumptions.