{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T22:22:27Z","timestamp":1786141347349,"version":"3.56.0"},"reference-count":69,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2024,9,3]],"date-time":"2024-09-03T00:00:00Z","timestamp":1725321600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["42176187"],"award-info":[{"award-number":["42176187"]}]},{"name":"National Natural Science Foundation of China","award":["62301592"],"award-info":[{"award-number":["62301592"]}]},{"name":"National Natural Science Foundation of China","award":["ZK21-30"],"award-info":[{"award-number":["ZK21-30"]}]},{"name":"Science Foundation of the National University of Defense Technology","award":["42176187"],"award-info":[{"award-number":["42176187"]}]},{"name":"Science Foundation of the National University of Defense Technology","award":["62301592"],"award-info":[{"award-number":["62301592"]}]},{"name":"Science Foundation of the National University of Defense Technology","award":["ZK21-30"],"award-info":[{"award-number":["ZK21-30"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>When a synthetic aperture sonar (SAS) system operates under low-frequency broadband conditions, the azimuth range coupling of the point target reference spectrum (PTRS) is severe, and the high-resolution imaging range is limited. To solve the above issue, we first convert multi-receivers\u2019 signal into the equivalent monostatic signal and then divide the equivalent monostatic signal into range subblocks and the range frequency subbands within each range subblock in order. The azimuth range coupling terms are converted into linear terms based on piece-wise linear approximation (PLA), and the phase error of the PTRS within each subband is less than \u03c0\/4. Then, we use the chirp-z transform (CZT) to correct range cell migration (RCM) to obtain low-resolution results for different subbands. After RCM correction, the subbands\u2019 signals are coherently summed in the range frequency domain to obtain a high-resolution image. Finally, different subblocks are concatenated in the range time domain to obtain the final result of the whole swath. The processing of different subblocks and different subbands can be implemented in parallel. Computer simulation experiments and field data have verified the superiority of the proposed method over existing methods.<\/jats:p>","DOI":"10.3390\/rs16173265","type":"journal-article","created":{"date-parts":[[2024,9,3]],"date-time":"2024-09-03T08:38:47Z","timestamp":1725352727000},"page":"3265","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["A Novel Chirp-Z Transform Algorithm for Multi-Receiver Synthetic Aperture Sonar Based on Range Frequency Division"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5390-268X","authenticated-orcid":false,"given":"Mingqiang","family":"Ning","sequence":"first","affiliation":[{"name":"Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heping","family":"Zhong","sequence":"additional","affiliation":[{"name":"Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinsong","family":"Tang","sequence":"additional","affiliation":[{"name":"Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3560-6478","authenticated-orcid":false,"given":"Haoran","family":"Wu","sequence":"additional","affiliation":[{"name":"Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiafeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengbo","family":"Ma","sequence":"additional","affiliation":[{"name":"Academy of Military Sciences, Beijing 100850, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,3]]},"reference":[{"key":"ref_1","unstructured":"Putney, A., Chang, E., Chatham, R., Marx, D., Nelson, M., and Warman, L.K. 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