Vol. 8, No. 2, 152-157, 2009
Dominique Derauw, Anne Orban and Christian Barbier
Abstract
Recently launched SAR sensors like TerraSAR-X or
CosmoSkyMed are equipped with wide bandwidth radar signal emitters. Working at large
bandwidth makes it possible to reach a metric range resolution which, combined
with a spotlight mode, leads to Very High Resolution (VHR) SAR imagery.
One can also take advantage of this wide band to split it into sub-bands and generate several lower resolution images from the same master one, each centred on a slightly different central frequency.
These sub-images can then be used in a classical interferometric process to estimate the inter-band coherence of a given scene. This inter-band coherence reveals scatterers keeping a stable phase behaviour along with frequency shift. In this paper, a simple model derived from Zebker's model for randomly distributed surface scatterers is proposed and examples are presented showing that scatterers can have a behaviour that deviates from the model, leading to a new information channel.
Submitted: 05 Sept 2009
Revised: 27 Oct 2009
Accepted: 02 Nov 2009
Published: 02 Dec 2009
Responsible editor: Preben Gudmandsen Citation
Derauw D, A Orban & C Barbier, 2009. Inter-band coherence of splitted wide band SAR images: a potentially new information channel. EARSeL eProceedings, 8(2): 152-157
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EARSeL European Association of Remote Sensing Laboratories, Strasbourg, France |
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BIS-Verlag |