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In the paper, we demonstrate several novel promising applications of high-accuracy Doppler measurements for airborne SAR systems. These are 1) estimation of the antenna beam orientation angles by analyzing the dependence of the Doppler centroid on the range, 2) improvement of quality of SAR images by an accurate estimation of the Doppler rate, and 3) retrieval of the topography of a scene from accurate, highresolution Doppler centroid measurements. Experimental results are given to prove the efficiency of these methods.