This letter discusses the detection and correction of
residual motion errors that appear in airborne synthetic aperture
radar (SAR) interferograms due to the lack of precision in the navigation
system. As it is shown, the effect of this lack of precision is
twofold: azimuth registration errors and phase azimuth undulations.
Up to now, the correction of the former was carried out by
estimating the registration error and interpolating, while the latter
was based on the estimation of the phase azimuth undulations to
compensate the phase of the computed interferogram. In this letter,
a new correction method is proposed, which avoids the interpolation
step and corrects at the same time the azimuth phase undulations.
Additionally, the spectral diversity technique, used to estimate
registration errors, is critically analyzed. Airborne L-band
repeat-pass interferometric data of the German Aerospace Center
(DLR) experimental airborne SAR is used to validate the method
CitacióP. Prats, A. Reigber, J.J. Mallorquí. (2004). Interpolation-free Coregistration and Phase-Correction of Airborne SAR Interferograms. IEEE Geoscience and remote sensing letters, 1 (3): 188-191. ISSN:1545-598X