Anno di pubblicazione: 2008
[Dou.CeTeM2008] Doubell, M., Fasano, L., Ferri, V., Lorè, V.A., Milillo, G., Nitti D.O., Nutricato, R., Conte, D., Bovenga, F., Valentino, A., “COSMO SKYMED qualitative analysis and examples using “GSDVIEW” open source graphic tool and interferometric measurements”. XIV Annual Meeting CeTeM / V Workshop AIT / XIV MECSA Day on Microwave Engineering. Microwave Remote Sensing: systems, propagation, algorithms: from technologies to applications. 23-24 Oct., 2008. Rome, Italy (2008).
The COSMO-SkyMed constellation will acquire data from its four SAR satellites in several image modes, and will generate focused data products. Presently, two satellites are in orbit. The constellation will be completed by 2009. In this paper we detail the analysis and experimentation carried out with the first COSMO-SkyMed real SAR data. A qualitative analysis and in part a quantitative analysis have been carried out with the support of the correspondent optical images. The steps used have been to: 1. Individualize the targets and the characteristics of the SAR data; 2. Verify the characteristics of the data, of the satellite configuration and of the SAR; 3. Interpret the data and the connected phenomena; 4. Carry out both qualitative and quantitative analysis on InSAR phase with preliminary height measurements. The operational instrument with which the COSMO-SkyMed images have been elaborated has been the “GSDView” Open Source Tool, currently under development by INNOVA Consorzio per l’Informatica la Telematica under an ASI (Italian Space Agency) contract. Various contexts have been analyzed within the SAR images, with specific attention to human interest areas, such as: metropolitan areas, ports and coasts and agricultural areas. The data set used for the analysis has been predominantly from SCS (Single-look Complex Slant), DGM (Detected Ground Multilook), GEC (Geocoded Ellipsoid Corrected) and GTC (Geocoded Terrain Corrected) products acquired by the COSMO-SkyMed satellites SAR1 and/or SAR2 in StripMap and Spotlight acquisition modes. The completed analysis shows the great potential of the sensor. The COSMO-SkyMed data regards the possible use in Earth Observation (EO) applications such as Change Detection (CD), Moving Target Detection (MTD), and Interferometry. The interferometric analysis first verified the impact of an improved tool for coregistering SAR images that uses DEM and orbital information instead of polynomial models. This approach results in better performance for high resolution CSK images especially in areas with rough topography. Once the InSAR processing chain was properly updated, interferograms were computed by using both CSK-1 and CSK-2 data and first height retrieval experiments were carried out. The higher resolution of CSK images and the short revisitation rate of the full constellation will ensure a more detailed InSAR phase allowing new potential applications (urban applications, precise DEM, etc.). The applications studied are of significant importance in both Military and Civil spheres because they consent target detection with geometric and physical characteristics. The stability and high resolution characteristics of the sensor together with the fast revisit rate foreseen for the COSMO-SkyMed system will allow to define new high level product categories and make possible new innovative applications for the EO field.
Attività realizzata da GAP nell’ambito del Contratto ASI – INNOVA n I/038/07/0 e I AA