We report on a new technique for the estimation of the total rotational velocity of a non-cooperative target using a single interferometric ISAR system. It uses 3D interferometric ISAR techniques to obtain a first estimate of the scatterers' positions and effective rotation vector. Then the second-order local polynomial Fourier transform (LPFT) is applied to estimate the second component of the total rotation vector, and therefore the total vector itself. The true three-dimensional size and shape of a target - an important metric for automatic target recognition - can thus be estimated. Cross-range resolution in the 2D ISAR images is also improved in the process.
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