Analysis of focal resolution for time-reversal arrays
Date Issued
2006
Date
2006
Author(s)
Lin, Ming-Hung
DOI
zh-TW
Abstract
Time-reversal processing is developed to enhance underwater acoustic communication in recent years. This technique has been introduced as an approach to compensate for distortion due to multiple path effect in propagation. In this thesis, the main objective is to analyze focal resolution (spatial and temporal resolution) and its relationship with element-number and the position of the time-reversal array. In the low-frequency part, simulation results of low-frequency signals received by the time-reversal array and retransmitted back to the source location are presented. In the high-frequency part, the time-reversal array is constructed with eight B&K-8104 hydrophones, and a NTU-ESOE water tank experiment is conducted to refocus signal. The experiment is also simulated using the image method to analyse the relation between the element position and the focal structure with cross-correlation function. The results of this research can help to provide the optimal design in building time-reversal array in the future.
Subjects
水下通訊
時間反轉法
聚焦解析度
交互相關性函數
Underwater communication
Time-reversal processing
Focal resolution
Cross-Correlation Function
Type
thesis
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