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In the paper, a novel method is proposed for retrieving topography of Earth surfaces by using a squint-mode airborne synthetic aperture radar with a single antenna. The idea of the method is based on the fact that the spatial location of a resolution cell on the ground can be found as the intersection of the range sphere, the Doppler cone, and the elevation plane of the antenna pattern. The method requires high-accuracy Doppler centroid measurements for each resolution cell from the backscattered signal, as well as accurate measurements of the antenna beam orientation angles.