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http://dx.doi.org/10.5762/KAIS.2020.21.5.69

Time-delay Estimation Method for Performance Enhancement of Underwater Source Localization using Doublet Array  

Sim, Min-Seop (Defence Agency for Technology and Quality(DTaQ) Naval Sea Systems Team 2)
Lee, Ji-Hyeog (Defence Agency for Technology and Quality(DTaQ) Naval Sea Systems Team 2)
Lee, Hyeong-Sin (Defence Agency for Technology and Quality(DTaQ) Naval Sea Systems Team 2)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.5, 2020 , pp. 69-76 More about this Journal
Abstract
The sound signal radiated from an underwater source is received by the hydrophone of the system, including multi-path time-delay and multi-path signal by sea surface and bottom reflection. The system using a time-delay between received signals for the source localization shows performance degradation due to incoherence by the multi-path propagation environment and the disturbance of a marine environment. Various types of array and signal processing have been used for robust source range and bearing estimation in this environment. In this paper, we use a line array composed of doublet array and an estimated time-delay correction method for robust localization performance in a multi-path propagation environment. Three doublet arrays are located on the same line, and the time-delay between signals received on each doublet array is estimated in a two-step procedure. The estimated time-delay value is obtained by the cross-correlation function and corrected by the interaction formula between the center-frequency of received signal and the geometry of the array with respect to aperture. By this proposed procedure, the range and bearing of source from array were calculated. In order to confirm the validity of the proposed method and array, we simulated localization and estimation using the Monte-Carlo method.
Keywords
Time-Delay Estimation; Doublet Array; Multi-Path Propagation; Localization; Cross-Correlation;
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