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This paper proposes a SAR image resolution enhancement method employing a multiframe super resolution technique. The super resolution process providing high robustness by local iterative operations is adopted in consideration with orbit deviations of a satellite and temporal changes. At first, offset functions between SAR images are estimated by co-registration with sub-pixel order. An initial high resolution image is simply produced by enlarging a master SAR image. The high resolution image is iteratively modified while the total error between simulated and original SAR images is larger than tolerance. Processing results of the resolution enhancement using ALOS PALSAR images are shown.