{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T18:38:51Z","timestamp":1761676731366,"version":"build-2065373602"},"reference-count":17,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2018,12,19]],"date-time":"2018-12-19T00:00:00Z","timestamp":1545177600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61571349"],"award-info":[{"award-number":["61571349"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Foundation for Innovative Research Groups of the National Natural Science Foundation","award":["61621005"],"award-info":[{"award-number":["61621005"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The anisotropic characteristic reflects discriminating features of the geometry of a scattering center. In this study, we propose a novel method based on the iterative re-weighted Tikhonov regularization (IRWTR) to achieve the extraction of anisotropic characteristics of scattering centers in the wide-angle SAR synthetic aperture radar (SAR) imaging. Moreover, based on the extracted anisotropic scattering behaviors, the incomplete imaging results of the distributed scattering centers are restored. In this paper, we first discussed the scattering property in SAR imagery from the perspective of attributed scattering center model (ASCM). The reason for the incomplete imaging results of the distributed scattering centers was also discussed based on the ASCM. Subsequently, we modeled the aspect-dependent amplitude responses of a scattering center as a linear combination of a set of orthogonal basis. Consequently, the extraction of anisotropic characteristics can be transformed into an inverse problem, which was solved by the proposed IRWTR with high efficiency and accuracy. After the extraction, we attempted to restore the complete image of a distributed scattering center, which consisted of only two points. The enhanced SAR image can reveal the actual shape of a target. Processing results of electromagnetic computation data validated that the proposed method is effective and efficient.<\/jats:p>","DOI":"10.3390\/rs10122066","type":"journal-article","created":{"date-parts":[[2018,12,19]],"date-time":"2018-12-19T12:12:44Z","timestamp":1545221564000},"page":"2066","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Extraction of Anisotropic Characteristics of Scattering Centers and Feature Enhancement in Wide-Angle SAR Imagery Based on the Iterative Re-Weighted Tikhonov Regularization"],"prefix":"10.3390","volume":"10","author":[{"given":"Yuexin","family":"Gao","sequence":"first","affiliation":[{"name":"National Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"},{"name":"Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi\u2019an 710071, China"}]},{"given":"Mengdao","family":"Xing","sequence":"additional","affiliation":[{"name":"National Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"},{"name":"Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi\u2019an 710071, China"}]},{"given":"Liang","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Physics and Optoelectronic Engineering, Xidian University, Xi\u2019an 71007, China"}]},{"given":"Zijing","family":"Zhang","sequence":"additional","affiliation":[{"name":"National Laboratory of Radar Signal Processing, Xidian University, Xi\u2019an 710071, China"},{"name":"Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi\u2019an 710071, China"}]}],"member":"1968","published-online":{"date-parts":[[2018,12,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1109\/MSP.2014.2311828","article-title":"Wide-angle synthetic aperture radar imaging: Models and algorithms for anisotropic scattering","volume":"31","author":"Ash","year":"2014","journal-title":"IEEE Signal Process. Mag."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3548","DOI":"10.1109\/TSP.2008.919392","article-title":"Sparse representation in structured dictionaries with application to synthetic aperture radar","volume":"56","author":"Varshney","year":"2008","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"5467","DOI":"10.1109\/TGRS.2016.2565693","article-title":"Polarimetric-anisotropic decomposition and anisotropic entropies of high-resolution SAR images","volume":"54","author":"Xu","year":"2016","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2095","DOI":"10.1109\/LGRS.2014.2320053","article-title":"Polarimetric target decomposition based on attributed scattering center model for synthetic aperture radar targets","volume":"11","author":"Duan","year":"2014","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"4279","DOI":"10.1109\/TGRS.2012.2226732","article-title":"A high-frequency multipeak model for wide-angle SAR imagery","volume":"51","author":"Fuller","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2604","DOI":"10.1109\/TAP.2017.2673764","article-title":"Attributed scattering center extraction algorithm based on sparse representation with dictionary refinement","volume":"65","author":"Liu","year":"2017","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1338","DOI":"10.1109\/TGRS.2008.2008999","article-title":"Through-the-wall SAR attributed scattering center feature estimation","volume":"47","author":"Ertin","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1109\/83.552098","article-title":"Attributed scattering centers for SAR ATR","volume":"6","author":"Potter","year":"1997","journal-title":"IEEE Trans. Image Process."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1179","DOI":"10.1109\/8.785750","article-title":"A parametric model for synthetic aperture radar measurements","volume":"47","author":"Gerry","year":"1999","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"6192","DOI":"10.1109\/TAP.2014.2360700","article-title":"A forward approach to establish parametric scattering center models for known complex radar targets applied to SAR ATR","volume":"62","author":"He","year":"2014","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_11","unstructured":"(2018, December 03). Altair FEKO\u2122: A Comprehensive Computational Electromagnetics Code. Introduction. Available online: https:\/\/altairhyperworks.com\/product\/FEKO."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"760","DOI":"10.1109\/TAES.2003.1238734","article-title":"Synthetic-aperture radar processing using fast factorized back-projection","volume":"39","author":"Ulander","year":"2003","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1150","DOI":"10.1109\/LGRS.2011.2158797","article-title":"Bayesian inverse synthetic aperture radar imaging","volume":"8","author":"Xu","year":"2011","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"5270","DOI":"10.1109\/TSP.2013.2273196","article-title":"Dynamic compressive sensing of time-varying signals via approximate message passing","volume":"61","author":"Ziniel","year":"2013","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"340","DOI":"10.1109\/TSP.2012.2222382","article-title":"Efficient high-dimensional inference in the multiple measurement vector problem","volume":"61","author":"Ziniel","year":"2013","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"5644","DOI":"10.1109\/TSP.2016.2586745","article-title":"Dynamic filtering of time-varying sparse signals via L1 minimization","volume":"64","author":"Charles","year":"2016","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Stojanovic, I., Cetin, M., and Karl, W.C. (2008, January 15). Joint space aspect reconstruction of wide-angle SAR exploiting sparsity. Proceedings of the SPIE\u2014The International Society for Optical Engineering, Orlando, FL, USA.","DOI":"10.1117\/12.786288"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/10\/12\/2066\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:34:56Z","timestamp":1760196896000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/10\/12\/2066"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,12,19]]},"references-count":17,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2018,12]]}},"alternative-id":["rs10122066"],"URL":"https:\/\/doi.org\/10.3390\/rs10122066","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2018,12,19]]}}}