{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T06:50:16Z","timestamp":1768719016248,"version":"3.49.0"},"reference-count":23,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2013,12,11]],"date-time":"2013-12-11T00:00:00Z","timestamp":1386720000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This paper presents a new approach for the discrimination of ship responses using polarimetric SAR (PolSAR) data. The PolSAR multidimensional information is analyzed using a linear Time-Frequency (TF) decomposition approach, which permits to describe the polarimetric behavior of a ship and its background area for different azimuthal angles of observation and frequencies of illumination. This paper proposes to discriminate ships from their background by using characteristics of their polarimetric TF responses, which may be associated with the intrinsic nature of the observed natural or artificial scattering structures. A statistical descriptor related to polarimetric coherence of the signal in the TF domain is proposed for detecting ships in different complex backgrounds, including SAR azimuth ambiguities, artifacts, and small natural islands, which may induce numerous false alarms. Choices of the TF analysis direction, i.e., along separate azimuth or range axis, or simultaneously in both directions, are investigated and evaluated. TF decomposition modes including range direction perform better in terms of discriminating ships from range focusing artifacts. In comparison with original full-resolution polarimetric indicators, the proposed TF polarimetric coherence descriptor is shown to qualitatively enhance the ship\/background contrast and improve discrimination capabilities. Using polarimetric RADARSAT-2 data acquired over complex scenes, experimental results demonstrate the efficiency of this approach in terms of ship location retrieval and  response characterization.<\/jats:p>","DOI":"10.3390\/rs5126899","type":"journal-article","created":{"date-parts":[[2013,12,11]],"date-time":"2013-12-11T12:03:16Z","timestamp":1386763396000},"page":"6899-6920","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Ship Discrimination Using Polarimetric SAR Data and Coherent Time-Frequency Analysis"],"prefix":"10.3390","volume":"5","author":[{"given":"Canbin","family":"Hu","sequence":"first","affiliation":[{"name":"College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China"},{"name":"Institute of Electronics and Telecommunications of Rennes, University of Rennes 1,  F-35042 Rennes, France"}]},{"given":"Laurent","family":"Ferro-Famil","sequence":"additional","affiliation":[{"name":"Institute of Electronics and Telecommunications of Rennes, University of Rennes 1,  F-35042 Rennes, France"}]},{"given":"Gangyao","family":"Kuang","sequence":"additional","affiliation":[{"name":"College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China"}]}],"member":"1968","published-online":{"date-parts":[[2013,12,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"384","DOI":"10.1109\/JOE.2012.2198931","article-title":"Reflection symmetry for polarimetric observation of man-made metallic targets at sea","volume":"37","author":"Nunziata","year":"2012","journal-title":"IEEE J. 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