Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water
A coherent-noncoherent joint processing framework is proposed for active sonar to combine diversity gain and beamforming gain for detection of a small target in shallow water environments. Sonar utilizes widely-spaced arrays to sense environments and illuminate a target of interest from multiple ang...
| Published in: | Sensors |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-04-01
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| Subjects: | |
| Online Access: | http://www.mdpi.com/1424-8220/18/4/1154 |
| _version_ | 1857035873297629184 |
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| author | Xiang Pan Jingning Jiang Si Li Zhenping Ding Chen Pan Xianyi Gong |
| author_facet | Xiang Pan Jingning Jiang Si Li Zhenping Ding Chen Pan Xianyi Gong |
| author_sort | Xiang Pan |
| collection | DOAJ |
| container_title | Sensors |
| description | A coherent-noncoherent joint processing framework is proposed for active sonar to combine diversity gain and beamforming gain for detection of a small target in shallow water environments. Sonar utilizes widely-spaced arrays to sense environments and illuminate a target of interest from multiple angles. Meanwhile, it exploits spatial diversity for time-reversal focusing to suppress reverberation, mainly strong bottom reverberation. For enhancement of robustness of time-reversal focusing, an adaptive iterative strategy is utilized in the processing framework. A probing signal is firstly transmitted and echoes of a likely target are utilized as steering vectors for the second transmission. With spatial diversity, target bearing and range are estimated using a broadband signal model. Numerical simulations show that the novel sonar outperforms the traditional phased-array sonar due to benefits of spatial diversity. The effectiveness of the proposed framework has been validated by localization of a small target in at-lake experiments. |
| format | Article |
| id | doaj-art-e2e76a59ea9b4064b2372713bde71cfa |
| institution | Directory of Open Access Journals |
| issn | 1424-8220 |
| language | English |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| spelling | doaj-art-e2e76a59ea9b4064b2372713bde71cfa2025-08-19T19:38:25ZengMDPI AGSensors1424-82202018-04-01184115410.3390/s18041154s18041154Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow WaterXiang Pan0Jingning Jiang1Si Li2Zhenping Ding3Chen Pan4Xianyi Gong5College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, ChinaHangzhou Xuejun High School, Hangzhou 310012, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, ChinaA coherent-noncoherent joint processing framework is proposed for active sonar to combine diversity gain and beamforming gain for detection of a small target in shallow water environments. Sonar utilizes widely-spaced arrays to sense environments and illuminate a target of interest from multiple angles. Meanwhile, it exploits spatial diversity for time-reversal focusing to suppress reverberation, mainly strong bottom reverberation. For enhancement of robustness of time-reversal focusing, an adaptive iterative strategy is utilized in the processing framework. A probing signal is firstly transmitted and echoes of a likely target are utilized as steering vectors for the second transmission. With spatial diversity, target bearing and range are estimated using a broadband signal model. Numerical simulations show that the novel sonar outperforms the traditional phased-array sonar due to benefits of spatial diversity. The effectiveness of the proposed framework has been validated by localization of a small target in at-lake experiments.http://www.mdpi.com/1424-8220/18/4/1154spatial diversitycoherent processingdetectionsonarat-lake experiment |
| spellingShingle | Xiang Pan Jingning Jiang Si Li Zhenping Ding Chen Pan Xianyi Gong Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water spatial diversity coherent processing detection sonar at-lake experiment |
| title | Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water |
| title_full | Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water |
| title_fullStr | Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water |
| title_full_unstemmed | Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water |
| title_short | Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water |
| title_sort | coherent and noncoherent joint processing of sonar for detection of small targets in shallow water |
| topic | spatial diversity coherent processing detection sonar at-lake experiment |
| url | http://www.mdpi.com/1424-8220/18/4/1154 |
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