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  • Research Article
  • Open Access

Higher-Order Permanent Scatterers Analysis

  • Alessandro Ferretti1, 2Email author,
  • Marco Bianchi1,
  • Claudio Prati2 and
  • Fabio Rocca2
EURASIP Journal on Advances in Signal Processing20052005:609604

Received: 25 September 2004

Published: 14 December 2005


The permanent scatterers (PS) technique is a multi-interferogram algorithm for DInSAR analyses developed in the late nineties to overcome the difficulties related to the conventional approach, namely, phase decorrelation and atmospheric effects. The successful application of this technology to many geophysical studies is now pushing toward further improvements and optimizations. A possible strategy to increase the number of radar targets that can be exploited for surface deformation monitoring is the adoption of parametric super-resolution algorithms that can cope with multiple scattering centres within the same resolution cell. In fact, since a PS is usually modelled as a single pointwise scatterer dominating the background clutter, radar targets having cross-range dimension exceeding a few meters can be lost (at least in C-band datasets), due to geometrical decorrelation phenomena induced in the high normal baseline interferograms of the dataset. In this paper, the mathematical framework related to higher-order SAR interferometry is presented as well as preliminary results obtained on simulated and real data. It is shown how the PS density can be increased at the price of a higher computational load.

Keywords and phrases

RADAR remote sensingsynthetic aperture RADARinterferometric applicationspermanent scatterer analysis

Authors’ Affiliations

Tele-Rilevamento Europa S.r.l. (TRE), Milano, Italy
Dipartimento di Elettronica e Informazione, Politecnico di Milano, Milano, Italy


© Alessandro Ferretti et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.