Underwater static targets are objects under the water that can¡¦t move autonomously. Apparatus feasible for detecting underwater static targets includes: optics, acoustics and geophysical instruments.
The purpose of this research is discussing the efficiency of applying side-scan sonar, magnetometer, sub-bottom profiler and echo sounder simultaneously to search, detect, identify and locate underwater static targets. Procedures of this research include:
1. Discussing the capabilities of instruments and identification principles on target.
2. Using a real case to groundtruth target identification principles.
3. Assessing the superiority of the methodology.
According to the characteristics of these apparatus, the water depth, collected by echo sounder, is capable of expressing the relief of the seabed. Seabed sonographs, recorded by side-scan sonar, show that it is feasible to detect, identify and locate targets on the seabed. Sub-bottom profiler provides the sub-surface sedimentary information which can be used to detect buried targets. Magnetometer can detect environmental magnetic intensities, which can locate and determine the size of ferrous targets.
Analysis of the data collected at Hai-Köu Wan, Ping-Dong County yields following conclusions:
1. The water depth data, recorded per 15 meters by the echo sounder, is capable of detecting large targets and concentrated artificial reefs only.
2. Sonographs obtained by side-scan sonar show target¡¦s characteristics and location on seabed. It can be utilized to identifying targets and mapping targets distributions.
3. Sub-bottom profile graphs show the composition and thickness of sub-surface sediments.
4. Magnetic anomalies show that there are evident variations around the battle-ship reef or concentrated electric-pole reefs on the research area. It represents that the magnetometer is capable in detecting underwater ferrous targets.
5. Targets detecting rate and identifying accuracy can be increased by the mutual comparison of various information.
By applying the technique established in this research and the survey results at Hai-Köu Wan, targets at the survey site can be identified and located precisely. There are about 1100 units of 2-m concrete reefs, 670 units of electric-pole reefs and a battle-ship reef at Hai-Köu Wan.
It can be concluded that, applying echo-sounder, side-scan sonar system, sub-bottom profiler and magnetometer simultaneously can search, detect, identify and locate underwater static targets more effective than applying a single instrument such as side-scan sonar system.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0628105-130048 |
| Date | 28 June 2005 |
| Creators | Shen, Chih-Yung |
| Contributors | none, Wen-Miin Tian, none, none, none |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628105-130048 |
| Rights | unrestricted, Copyright information available at source archive |
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