{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T18:28:17Z","timestamp":1761676097053,"version":"build-2065373602"},"reference-count":14,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2013,8,29]],"date-time":"2013-08-29T00:00:00Z","timestamp":1377734400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper addresses the problem of direction-of-arrival (DOA) estimation of multiple wideband coherent chirp signals, and a new method is proposed. The new method is based on signal component analysis of the array output covariance, instead of the complicated time-frequency analysis used in previous literatures, and thus is more compact and effectively avoids possible signal energy loss during the hyper-processes. Moreover, the a priori information of signal number is no longer a necessity for DOA estimation in the new method. Simulation results demonstrate the performance superiority of the new method over previous ones.<\/jats:p>","DOI":"10.3390\/s130911490","type":"journal-article","created":{"date-parts":[[2013,8,29]],"date-time":"2013-08-29T12:45:08Z","timestamp":1377780308000},"page":"11490-11497","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Covariance-Based Direction-of-Arrival Estimation of Wideband Coherent Chirp Signals via Sparse Representation"],"prefix":"10.3390","volume":"13","author":[{"given":"Zhichao","family":"Sha","sequence":"first","affiliation":[{"name":"College of Electronic Science and Engineering, National University of Defense Technology,  Changsha 410073, China"}]},{"given":"Zhengmeng","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Electronic Science and Engineering, National University of Defense Technology,  Changsha 410073, China"}]},{"given":"Zhitao","family":"Huang","sequence":"additional","affiliation":[{"name":"College of Electronic Science and Engineering, National University of Defense Technology,  Changsha 410073, China"}]},{"given":"Yiyu","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of Electronic Science and Engineering, National University of Defense Technology,  Changsha 410073, China"}]}],"member":"1968","published-online":{"date-parts":[[2013,8,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1826","DOI":"10.1109\/TSP.2006.871977","article-title":"Ambiguity-function-based techniques to estimate DOA of broadband chirp signals","volume":"54","author":"Ma","year":"2006","journal-title":"IEEE Trans. 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