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Optimum resolution in the Doppler spectra of rotating targets is obtained by using an optimum aspect angle window from which the data for the Fourier transforms are taken. The width of the optimum aspect angle window depends on the location, relative to the axis of rotation, of the scattering center to be resolved, so that for optimum resolution a sort of focusing by choosing the appropriate aspect angle window is necessary. Formulae and graphs for optimum width of aspect angle windows and the obtainable resolutions are given. Typical applications of the scheme presented are in the experimental determination of the location, the strength, and the interaction of the scattering centers on a target. These in turn are of major interest, e.g., for the analysis and synthesis of radar cross sections, in glint investigations, and in target imaging.