Baseline is an important parameter in synthetic aperture radar interferometry (InSAR). Tiny errors in length and inclination of the baseline can cause a great error of the interferometric phase, and eventually affect accuracy of the spatial information. This paper proposes a method to optimize estimation of baseline by using quadratic multi-polynomial aimed at unwrapped phase to eliminate the interferometric phase influence caused by the baseline error. TerraSAR-X, COSMO-SkyMed, RadarSat-2 and ASAR images are used to verify effectiveness of the proposed method.
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