Coherent Scatterers on ALOS/PalSAR data: Detection, analysis and potentials

Rafael Zandona-Schneider(1) and Konstantinos Papathanassiou(1)

(1) German Aerospace Center (DLR), Muenchnerstrasse 20, D-82230, Wessling, Germany


In this work, Coherent Scatterers (CSs) are detected using fully polarimetric data of the ALOS/PalSAR sensor over the city of Munich in Germany and Gifu in Japan. CSs are scatterers presenting a point-like scattering behavior, and are detected using spectral correlation of SAR images [1]. The deterministic scattering properties of CSs suggest their utilization in different fields [2],[3].

The polarimetric characterisation of CSs is analysed along the time axis, on the basis of PalSAR time series data of the test sites. The time stability of the polarimetric properties of CSs is investigated.

Spaceborne SAR systems operating at low frequencies, as the L-band PalSAR sensor, may suffer from different ionospheric effects. Dispersion, signal scintillations, group delay and Faraday rotation, are examples of the ionospheric effects causing range and azimuth defocusing, time delay errors and polarisation mismatch on SAR images. The potential of CSs for the mitigation of the different ionospheric induced disturbances is discussed.

This work is performed in the frame of the ALOS proposal: ALOS ADEN AO nr. 3732.

[1] R. Zandona-Schneider, K. P. Papathanassiou, I. Hajnsek and A. Moreira, "Polarimetric and interferometric characterization of coherent scatterers in urban areas", vol. 44, Nr. 4, pp. 971-984, April 2006.

[2] R. Zandona-Schneider, L. Marotti and K. P. Papathanassiou, "Coherent Scatterers at Different Polarizations and Frequencies", EUSAR 2006, Dresden, Germany, 16-18 May, 2006.

[3] R. Zandona-Schneider and K. P. Papathanassiou, "Ionospheric Correction by Means of Coherent Scatterers", EUSAR 2008, Friedrichshafen, Germany, 2-5 June, 2008.


Symposium presentation


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