Preprocessing to improve the quality of SAR interferogram

In this paper, the preprocessing method for improving the quality of interferograms is described The method consists of three processing steps - azimuth filtering, range filtering and oversampling. It is shown that the first two steps are effective to eliminate the decorrelation caused by spectrum misalignment in azimuth and range and the oversampling can eliminate the error introduced by the aliasing because of convolution in frequency domain. The validity of the proposed method is verified by ERS SLC data.

[1]  Fabio Rocca,et al.  The wavenumber shift in SAR interferometry , 1994, IEEE Trans. Geosci. Remote. Sens..

[2]  R. Hanssen.  Radar Interferometry: Data Interpretation and Error Analysis , 2001 .

[3]  R. Bamler,et al.  Phase statistics of interferograms with applications to synthetic aperture radar. , 1994, Applied optics.

[4]  Howard A. Zebker,et al.  Decorrelation in interferometric radar echoes , 1992, IEEE Trans. Geosci. Remote. Sens..

[5]  M. Schwabisch,et al.  Improvement of phase and coherence map quality using azimuth prefiltering: examples from ERS-1 and X-SAR , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.