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Milano, Italy

Bienati N.,ENI S.p.A | Mazzucchelli P.,ARESYS | Codazzi M.,ENI S.p.A
74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources

3D multiple elimination plays a fundamental role in marine data processing. 3D SRME algorithm has some manifest advantages with respect to other multiple elimination techniques: in particular its accuracy and its fully data-driven nature that allows the application in the early stages of processing propose it as the benchmark for surface related multiple estimation and elimination. In this abstract we address the problem of the automatic optimization of SRME operator aperture. We exploit the valuable information hidden in the Multiple Contribution Gather to define the summation area that contains the Downward Reflection Points for the different multiple generators. The computation of 3D stacking volumes allows to remove some of the aliasing artifacts that contaminate the estimated multiples. Moreover, as a pleasant side-effect, the overall computational cost of 3D SRME task can be lowered by carefully exploiting this technique. Results on a 3D narrow azimuth dataset prove the correctness and feasibility of the proposed approach. Source

Belotti M.,Polytechnic of Milan | D'Aria D.,ARESYS | Guccione P.,Polytechnic of Bari | Miranda N.,European Space Agency | And 2 more authors.
IEEE Transactions on Geoscience and Remote Sensing

This paper proposes a set of tests that provide necessary and, as far as possible, sufficient conditions for verifying the phase preservation of synthetic aperture radar (SAR) processors. This paper discusses two different test families composed of self-consistency and point-Target-based tests. The set of self-consistent tests extends the well-known CEOS-OFFSET to very different acquisition modes, namely, StripMAP, ScanSAR, TopSAR, and SPOTLIGHT, and introduces a new complementary test to check the consistency of the space-variant implementation of a processor. The set of point target tests, based on the analysis of point target simulated data, completes the self-consistent tests by providing a verification of phase accuracy between different bursts and swaths. © 1980-2012 IEEE. Source

Belotti M.,Polytechnic of Milan | D'Aria D.,ARESYS | Iannini L.,Polytechnic of Milan | Guarnieri A.M.,Polytechnic of Milan | Scirpoli S.,Polytechnic of Milan
International Geoscience and Remote Sensing Symposium (IGARSS)

The aim of this paper is the definition of a series of quantitative phase preserving tests that would be a necessary tool to evaluate the performance of different focusing algorithms and to define some necessary conditions to validate their efficacy and precision. The tests have been thought and defined to form a general tool that can cope with a wide number of systems and acquisition geometries. © 2011 IEEE. Source

Guarnieri A.M.,Polytechnic of Milan | Bombaci O.,Thales Alenia | Germani C.,Thales Alenia | Orlando G.,Thales Alenia | And 3 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS)

The paper proposes two different architectural solutions for a quasi-geostationary monostatic SAR, hosted on-board of a COMSAT satellite, aiming at monitoring water-vapor, for Numerical Weather Forecast on a sub-continental scale, and hazards like hydrogeological landslides and deformations on a local scale. The two architectures address a system that combines an L-band, wide coverage beam, for coarse resolution imaging, and an X-band, spot beam, for fine resolution imaging. The challenge is to allow the X-band spot to be positioned everywhere within the L-band coverage, that should be hold fixed, but exploiting the same wide reflector. © 2015 IEEE. Source

D'Aria D.,ARESYS | Ferretti A.,Tele Rilevamento Europa TRE | Ferretti A.,TRE Canada Inc. | Guarnieri A.M.,ARESYS | And 2 more authors.
IEEE Transactions on Geoscience and Remote Sensing

We propose a calibration method suitable for a set of repeated synthetic aperture radar (SAR) acquisitions that uses both absolute calibrated devices (such as corner reflectors) and stable targets identified in the scene [the permanent scatterers (PSs)]. Precisely, the role of the PS is to extend the initial calibration sequence by monitoring the radiometric stability of the system throughout the whole mission life span. At a first step, this paper approaches the problem of PS-based normalization by an iterative maximum-likelihood method that exploits the stack of complex interferometric SAR images. Two solutions are given based on different assumptions on the PS phases. As a second step, the merging of these estimates with the available calibration information is discussed. Results achieved by experimental acquisitions are shown in two different SAR systems: 1) a C-band spaceborne SAR and 2) a Ku-band ground-based SAR. © 2009 IEEE. Source

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