Abstract
An array extension method in a noisy environment was proposed to improve angular resolution and array gain. The proposed method combines the FOC (fourth-order cumulants) technique with the ETAM (extended towed array measurements) method to extend array aperture and suppress Gaussian noise. First, successive measurements of a virtual uniform linear array were constructed by applying fourth-order cumulants to measurements of uniform linear array; Gaussian noise in these measurements was also eliminated. Then, the array was extended by compensating phase differences using the ETAM method. Finally, the synthetic aperture was extended further by the fourth-order cumulants technique. The proposed FOC-ETAM-FOC method not only improves angular resolution and array gain, but also effectively suppresses Gaussian noise. Furthermore, it inherits the advantages of the ETAM method. Simulation results showed that the FOC-ETAM-FOC method achieved better angular resolution and array gain than the ETAM method. Furthermore this method outperforms the ETAM method in Gaussian noise environment.
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Foundation item: Supported by the National Science Foundation of China (No.60872146)
Bo Li was born in 1983. She is a Ph.D candidate at the College of Marine, Northwestern Polytechnical University. Her current research interests include underwater acoustic signal processing and array signal processing.
Chao Sun was born in 1965. She is a professor, doctoral advisor and department head of Institute of Acoustics Engineering in Northwestern Polytechnical University. She works in the field of sonar technology and underwater acoustic signal processing, etc.
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Li, B., Sun, C. An array extension method in a noisy environment. J. Marine. Sci. Appl. 10, 226–232 (2011). https://doi.org/10.1007/s11804-011-1063-4
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DOI: https://doi.org/10.1007/s11804-011-1063-4