碩士 / 國立中山大學 / 海下科技暨應用海洋物理研究所 / 102 / When communications or detection in the ocean, sonar system is the main tool for signal transmission and ocean ambient noise is one of the important parameters in it. Ocean ambient noise includes various and diverse sources like wind, rain, marine life, ship, and etc. Using different ways to analyze are needed to understand the complicated properties of ocean ambient noise, therefore sonar system performance prediction can be improved significantly. In this study , the ocean ambient noise data were collected in summer of 2012 at Taiwan southeastern and northeastern seas, then analyzed and compared the characteristics and divergence of wind-wave and rain- generated noises of same period , and plot wind-wave and rain- generated spectrum to compare noise level in different frequency and sea states at different seas. Finally, calculated the high frequency(>0.5 kHz) noise energy budgets of wind-wave and rain generated. Furthermore, using residual analysis to select good data of noise and wind speed before data processing, when the good data meet the assumptions of linear regression, then the wind-wave noise prediction equations from can be obtained. The estimation and measurement of noise level were compared to verify the equations are accurate. In low frequency (<0.5 kHz), ambient noise has periodic peak shown in spectrum, the noise level increases 10 to 15 dB every 24 hours. By using sea level and temperature data, the periodic fluctuation of low frequency sound level is proved to be related to the tidal current.
| Identifer | oai:union.ndltd.org:TW/102NSYS5281007 |
| Date | January 2013 |
| Creators | Du Pei-lun, 杜沛倫 |
| Contributors | Ruey-Chang Wei, 魏瑞昌 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 92 |
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