碩士 / 國立成功大學 / 系統及船舶機電工程學系碩博士班 / 97 / Abstract
This thesis includes two subjects. Mainly in the first part is established a measurement system of the underwater acoustic with wideband diversity imaging. The second part is applied non-linear electronic circuit load in submarine.
The first part is to get abundant Fourier space data. In order to achieve the purpose of the wideband diversity, it will be used to scan more frequencies and matching the angular diversity techniques to capture the Fourier space data of metal cylinder and then these scatter data display by bi-linear interpolation to Cartesian coordinates of the position, and finally by two-dimensional inverse Fourier transformation image reconstruction. To understand the principle of image reconstruction, Fourier space display method, two-dimensional linear interpolation method, Fourier transform relationship and the importance of calibration. In this paper, established by measurement of underwater acoustic imaging system, the future can be applied to the seabed to detect.
The second part, takes the signal source by the acoustic wave, launching a base frequency signal, receive signal by hydrophone and passes the nonlinear circuit launching again. Observes whether to have this base frequency signal or other multi-frequencies. Experiments show that in the final measurement of the signal, in addition to the original frequency signals, it also contains a number of frequency components of the signal frequency. In this paper, the experimental system as can be frequency automatically generated the signal can be applied to the future of underwater submarine electronic warfare.
The results presented in this thesis can be applied to the future of underwater technologies, including seabed exploration, underwater submarine electronic warfare, and combined with the underwater communication to develop advanced underwater technology.
Keywords: Image reconstruction, Wideband diversity, Angular diversity, Non-linear load, Harmonic.
| Identifer | oai:union.ndltd.org:TW/097NCKU5345048 |
| Date | January 2009 |
| Creators | Kuan-hua Tseng, 曾冠華 |
| Contributors | Kun-chou Lee, 李坤洲 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 69 |
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