|Reference : Wide band SAR sub-band splitting and inter-band coherence measurements|
|Scientific journals : Article|
|Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others|
|Wide band SAR sub-band splitting and inter-band coherence measurements|
|De Rauw, Dominique [Université de Liège - ULg > > CSL (Centre Spatial de Liège) > >]|
|Orban, Anne [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]|
|Barbier, Christian [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]|
|Remote Sensing Letters|
|Taylor & Francis|
|[en] SAR ; Coherence ; sub-band splitting ; wide-band|
|[en] Range resolution of SAR images is determined by transmitted radar signal bandwidth. Most recent SAR sensors use wide band signals in order to achieve metric range resolution, whereas metric azimuth resolution can be achieved in spotlight mode. As an example, ENVISAT ASAR sensor uses a 15-MHz bandwidth chirp whereas TerraSAR-X spotlight mode uses signals having a 150-MHz bandwidth leading to a potentially 10 times higher resolution. One can also take advantage of wide band to split the full band into sub-bands and generate several lower resolution images from a single acquisition, each being centred on slightly different frequencies. These sub-images can then be used in a classical interferometric process to measure inter-band coherence of a given scene. This inter-band coherence reveals scatterers keeping a stable-phase behaviour along with frequency shift. A simple coherence model derived from Zebker model for randomly distributed surface scatterers is proposed. Examples are presented, showing that scatterers can have a behaviour that deviates from the model, leading to a new information channel.|
|Centre Spatial de Liège - CSL|
|Agence spatiale européenne - ESA|
|WiMCA - Wide Band interferometric Multichromatic Analysis|
|Author Posting. (c) 'Taylor & Francis', 2010.
This is the author's version of the work. It is posted here by permission of 'Taylor & Francis' for personal use, not for redistribution.
The definitive version was published in Remote Sensing Letters, Volume 1 Issue 3, September 2010.
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