1,720,990 research outputs found
Performance evaluation of radar detection schemes based on CA-CFAR against K-distributed clutter
No full textPolarimetric detectors of extended targets for ship detection in SAR images
No full textThis paper deals with polarimetric detection of ships in SAR images of medium/high resolution (about meters). The aim is to develop detection techniques able to exploit the polarimetric information in order to improve the detection capability of ships or generally man-made targets modelled as extended targets (i.e. occupying multiple pixels). Both a decentralized and a centralized approach are considered for the fusion of the polarimetric information and their performance are characterized
Exploiting the polarimetric information for the detection of ship targets in non-homogeneous SAR images
No full textShip detection in polarimetric SAR images of non-homogeneous sea areas is considered. We demonstrate the impact of non-homogeneous sea features on the False Alarm Rate and the need of extracting the image structure. We thus introduce polarimetric segmentation procedures that cooperate with high-resolution polarimetric detection features for the control of the false alarms. Different polarimetric segmentation-plus-detection procedures are tested over real data to devise the appropriate method to exploit the polarimetric information
GLRT-detection performance in subsurface sounding
No full textThe performance of subsurface deep sounding is investigated with reference to the radar sounder MARSIS, aboard the Mars Express mission, designed to investigate the presence of water-related interfaces in the subsurface of Mars. The analysis proposed in this paper aims at providing the necessary tools for (i) performance prediction and (ii) data processor design. To this aim, by using well known models for the backscattered signal, we compare the expected Signal-to-Clutter Ratio values under most of the instrument operative conditions. The Generalized Likelihood Ratio approach is followed for subsurface interface detection, and along-track integration is introduced in order to achieve the desired performance. In particular, we address the design of the integration window, and the requirements of data homogeneity. A thorough performance analysis is presented to cope with the expected MARSIS scenarios. In particular, we investigate several sources of mismatch between the assumed model and collected data, and derive the performance degradation due to each source
Analisi geotecnica dei fenomeni franosi nelle coltri piroclastiche della provincia di Napoli
No full textThe European STREP Project: on board processing of an innovative GPR for the efficient monitoring of rail track subsurface conditions
No full textSubsurface sounding of Mars: Multi-pulse detection of water-related interfaces
No full textWe introduce optimized multi-pulse algorithms for the analysis of Mars surface and subsurface radar data, referring in particular to the data which should be acquired by the MARSIS instrument in the near future. The proposed processing schemes aim at detecting the presence and estimating the depth of water-related subsurface interfaces. A statistical model is introduced to cope with the expected scenario, and Maximum Likelihood based detection and estimation techniques are derived. The performance of the new techniques is deeply investigated proving the effectiveness of the proposed approaches
BONDING SURFACE BETWEEN RECYCLED AGGREGATE AND NEW CEMENT PASTE
No full textUNIVERSITY OF DUNDEE - DEPT. OF TRADE AND INDUSTRY CONFERENCE CENTRE. LONDON UK - THOMAS TELFORD PUBLISHING
- …
