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Editorial for the special issue "remote sensing of target detection in marine environment"
No full textON THE DEGREE OF POLARISATION OF A FISHING TRAWLER UNDER SAR INCIDENCE ANGLE DIVERSITY
No full textIn this study, the L-band polarimetric scattering of a fishing trawler is investigated with respect to the synthetic aperture radar incidence angle. This unique opportunity is explored using a time series of airborne uninhabited aerial vehicle synthetic aperture radar imagery where the same small fishing trawler is observed under a broad range of incidence angles, spanning from about 35◦ up to 55◦. The degree of polarization and its polarization signature are extracted from the synthetic aperture radar data set to evaluate the L-band polarimetric scattering of the ship target under analysis, with emphasis on the changes in the ship scattering associated with the polarized part of the backscattered signal. Furthermore, changes in the dynamic of the degree of polarisation signature over the fishing trawler and a reference target-free sea surface area are analyzed quantitatively, showing that the polarized component of the L-band signal scattered off sea and ship is significantly sensitive to the acquisition geometry, i. e., the synthetic aperture radar incidence angle
Polarimetric Scattering by a Vessel at Different Incidence Angles
No full textIn this study, the polarimetric scattering of a ship and the surrounding sea is analyzed at multiple incidence angles using fully polarimetric L-band synthetic aperture radar data. The behavior of polarized and unpolarized backscatter is analyzed using the degree of polarization, the signature of the degree of polarization, and the pedestal height. Experimental results show that, although the unpolarized backscattered power increases monotonically versus the incidence angle for both target and sea, the two scenarios call for distinctive polarimetric behaviors. The polarized component in the backscattered signal is demonstrated to be the main source of variability of the target-to-clutter ratio against the incidence angle
Dual-polarimetric TerraSAR-X SAR data for target at sea observation
No full textA physical dual-polarimetric model to observe man-made metallic targets at sea in dual-polarimetric coherent X-band SAR data is proposed. The model exploits the intrinsic different symmetry properties of man-made targets and sea surface and is tested over actual StripMap TerraSAR-X HH-HV and VV-VH dual-polarimetric SAR data and co-located ground truth measurements. Then, an operational physically-based filter to observe targets at sea is proposed. The filter is very attractive both in terms of detection performances and processing time. A typical SAR scene is processed in seconds by a conventional PC processor
Dual-polarized TerraSAR-X data for oil-spill observation
No full textA study exploiting dual-polarimetric X-band synthetic aperture radar (SAR) data to observe oil at sea is undertaken for the first time. The polarimetric model exploits the interchannel correlation between the like polarized channels. Accordingly, two parameters related to the interchannel correlation, namely, the amplitude coherence and the copolarized phase difference (CPD) standard deviation, are accounted for, and their performances, with respect to sea oil slick observation, are carefully discussed. Single-look Slant range Complex dual-polarized TerraSAR-X SAR data, in which both certified oil slicks and weak-damping look-alikes are present, are used to verify the efficiency of the proposed approaches. Results show the advantage of the CPD approach and the effectiveness of TerraSAR-X dual-polarized products for such application
Tandem-X bistatic polarimetric mode for maritime applications
No full textIn this study, TanDEM-X full-polarimetrlc bistatic and monostatic imagery are exploited for maritime applications purposes. The Mueller matrix and the phase difference between co-polarized channels (CPD) are exploited to deal with both the monostatic and the bistatic scenes. Subtle differences are found between the Mueller matrix collected in bistatic/monostatic mode; while similar performance is achieved when the CPD is exploited
ANALYSIS OF THE EFFECT OF THE INCIDENCE ANGLE ON POLSAR SHIP SCATTERING
No full textThis study investigates the behavior of polarimetric scattering from ships for varying incidence angles using a time series of full-polarimetric Synthetic Aperture Radar (SAR) imagery. The time series of PolSAR imagery consists of L-band airborne UAVSAR overpasses over a moving fishing ship imaged at different incidence angles. The experimental analysis consists of discussing the behavior of multi-polarization backscattering and polarimetric features associated to the ship scattering mechanisms at variance of the incidence angle. Preliminary results show that incidence angle affects both the intensity of the backscattering signals and polSAR features
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