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Using POL-INSAR at X-Band: observations

Mrs Pascale Dubois-Fernandez (1), Mr Xavier Dupuis(1) , and Philippe Paillou(2)

(1) ONERA, Centre de Salon, BA701, 13661 SALON AIR CEDEX, France
(2) Observatoire de Bordeaux, BP89, 32270 Floirac, France


The ONERA RAMSES system (Radar Aéroporté Multi-spectral d'Etude des Signatures) is a flexible SAR system in constant evolution developed mainly as a test bench for new technologies and to provide specific data for TDRI (Target Detection, Recognition and Identification) algorithm evaluation. It is flown on a Transall C160 platform operated by the CEV (Centre d'Essais en Vol). Recently a POL-INSAR mode has been added where the system is able to acquire simultaneous interferometric polarimetric data in X band. This paper presents an on-going research effort to analyze the influence of the system parameters (frequency, noise , resolution) on the characterization provided by POLINSAR technics. .It relies on the analysis of data acquired over Martigues, and Avignon in Southern France. The polarimetry associated with interferometry provides the necessary elements for understanding the different scattering mechanisms. However, the high frequency linked to reduced penetration is simplifying the modeling of electromagnetic interactions. Volume scattering is not as important in X-Band as with the lower frequencies and decorrelation effect (apart from system noise) can be attributed mainly to mixed contribution linked to elements at different heights inside each pixel.


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