{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:17:42Z","timestamp":1760149062322,"version":"build-2065373602"},"reference-count":18,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2023,6,26]],"date-time":"2023-06-26T00:00:00Z","timestamp":1687737600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Signals"],"abstract":"<jats:p>Experimental data from the SACLANTCEN 1993 Mediterranean Experiment are reviewed to assess the reduction of the search space for the localization and tracking of an acoustic source in a three-dimensional environment. Key to this goal is the availability of an initial estimate of source range and depth (called the 2D initial guess); an ambiguous estimate of source bearing can be obtained from the 2D initial guess through Environmental Signal Processing, and the ambiguity can be removed by searching for the source only in the range\/bearing regions where bearing estimates are higher. This search provides a new estimate of source range and a single bearing, which together with the estimate for source depth constitute the center of the reduced search space for source localization and tracking. The suggested approach is tested on experimental data from the SACLANTCEN experiment considering different frequencies, as well as a stationary and a moving source.<\/jats:p>","DOI":"10.3390\/signals4030025","type":"journal-article","created":{"date-parts":[[2023,6,26]],"date-time":"2023-06-26T05:39:13Z","timestamp":1687757953000},"page":"478-488","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Search Space Reduction for Localization and Tracking of an Acoustic Source"],"prefix":"10.3390","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0375-1892","authenticated-orcid":false,"given":"Orlando Camargo","family":"Rodr\u00edguez","sequence":"first","affiliation":[{"name":"LARSyS, Campus de Gambelas, Universidade do Algarve, 8005-139 Faro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3470-5215","authenticated-orcid":false,"given":"Lilun","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Meteorology and Oceanography, National University of Defense Technology, 109 DeYa Road, Kaifu District, Changsha 410073, China"}]},{"given":"Xinghua","family":"Cheng","sequence":"additional","affiliation":[{"name":"College of Meteorology and Oceanography, National University of Defense Technology, 109 DeYa Road, Kaifu District, Changsha 410073, China"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"363","DOI":"10.1121\/1.380872","article-title":"Use of calculated sound fields and matched field detection to locate sound sources in shallow water","volume":"59","author":"Bucker","year":"1976","journal-title":"J. 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Acoust."}],"container-title":["Signals"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2624-6120\/4\/3\/25\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:00:42Z","timestamp":1760126442000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2624-6120\/4\/3\/25"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,6,26]]},"references-count":18,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2023,9]]}},"alternative-id":["signals4030025"],"URL":"https:\/\/doi.org\/10.3390\/signals4030025","relation":{},"ISSN":["2624-6120"],"issn-type":[{"type":"electronic","value":"2624-6120"}],"subject":[],"published":{"date-parts":[[2023,6,26]]}}}