Abstract
Recently ground-based synthetic aperture radar (GB-SAR) has been an important technical means in remote sensing deformation monitoring. However, similar to spaceborne and airborne SAR, the accuracy of GB-SAR interferometry is also seriously affected by atmospheric phase disturbances. In this paper, a novel GB-SAR atmospheric phase correction (APC) algorithm based on coherent scatterers (CSs) is proposed. Firstly, coherent scatterers is selected by frequency interleaved sub-images entropy [1], which only use a single pair of echo data. Then spatial correlation is used for distinguish the stable control points among the coherent scatterers. Finally, the atmospheric phase screen (APS) can be obtained by spatial interpolation and polynomial fitting of the stable control points, which has zero deformation phase. Compared with the existing atmospheric phase correction algorithms, the proposed algorithm using short temporal characterized properties, which is more suitable for GB-SAR real-time deformation monitoring. And due to the spatial correlation of atmospheric phase, the new algorithm has strong robustness by combination of spatial interpolation and polynomial fitting.
Published Version
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