The needed interpolation of keystone transformation used for every subaperture is the bottleneck of imaging for lower frequency Synthetic Aperture Radar(SAR) especially for Ultra Wide Band(UWB) SAR with Planar Sub Aperture Processing(PSAP). A new in-terpolation method for keystone transformation is presented in this paper, and by mending the algorithm, the redundant computation of its realization is eliminated, the efficiency of the algorithm is improved notably. The computer simulation and the real data test results show that the modified PSAP can be applied to real-time UWB-SAR imaging of wide scene with fine resolution.
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