| Electrical and Electronic Engineering |
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| Focusing with the decomposition of the time reversal operator method in noisy environments |
| Chun-xiao LI, Jian-long LI, Xian-yi GONG, Ming-fei GUO |
| Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; Hangzhou Applied Acoustics Research, Hangzhou 310012, China; MOE Key Laboratory of Mechanical Manufacture and Automation, Zhejiang University of Technology, Hangzhou 310014, China |
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Abstract This paper presents a detailed analysis of the effects of noise (reverberation) on the focusing performance of decomposition of the time reversal operator (DORT) in a noise-limited case and in a reverberation-limited case, respectively. Quantitative results obtained from simulations and experiments are presented. The results show the DORT method can be efficiently applied to target detection with enough source level to yield significant backscatter. For a target placed on the bottom, the influence of the reverberation on the focusing performance is slight. However, distinguishing between a target and constant backscattering returning from strong local clutter on the bottom (false alarms) needs further research.
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Received: 14 July 2008
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