碩士 / 國立臺灣大學 / 工程科學及海洋工程學研究所 / 103 / In the underwater signal-receiving device, the detection and analysis of the ultrasonic signals is a real-time task and all the misjudgments must be prevented. Therefore we need to design a stable and real-time system, which means the time complexity of the analyzing method should be simplify; thus, the power consumption can be reduced.
We simulate the underwater ultrasonic signals and its attenuation by SMBV signal-generating device, and receive digital signals from a microcontroller with a 14-bit analog-to-digital converter. The frequency-domain based and time-domain based signal analyzing method both managed to detect the energy of the 1MHz signal with high dynamic range, and the computing time is also well-controlled.
| Identifer | oai:union.ndltd.org:TW/103NTU05345017 |
| Date | January 2014 |
| Creators | Wei-Jen Lee, 李偉仁 |
| Contributors | 陳昭宏 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 57 |
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