| Summary: | 碩士 === 大華科技大學 === 機電研究所 === 103 === The purpose of this research is to propose a feasible alternative by conducting facile acoustic target motion analysis when surface ship was threatened and attacked by fast moving torpedo (Target) under sea. However, surface ship equipped with the sonar(Sound Navigation and Ranging, SONAR)system may be able to detect the Target under water and obtain relevant information, which would still in nature face some great difficulties and obstacles due to various transmission media, such as the temperature, depth, terrain, salinity under the natural environment of sea. Surface ship with passive sonar system to detect the Target under sea were to monitor and follow the traces left by the Target. The collected information regarding the Target need be read and analyzed as necessity. Furthermore, the system which combined with the target motion analysis is able to quickly estimate the location of the Target and visualize the Target’s moving traces. The system with the target motion analysis could directs surface ship how to maneuvering evasion and then set up decoys duly and efficiently, making the Target under sea attack toward the direction of decoys and deviate from surface ship, and to protect surface ship or fleet from attacks as well as to enhance the countermeasure of surface ship.
While applying facile acoustic target motion analysis to the sonar system equipped with the surface ship may still lack for the complete information of torpedo detection, this research is able to successfully solve the problems of tracing and locating torpedo under such a circumstance. When the direction of the torpedo is quickly calculated and estimated, the visual traces of Target motion have also been drawn simultaneously, helping a commander promptly come out with a plan responding to the threat of the torpedo. For the future research, it will focus on enhancement of the abilities to process and detect acoustic signals of the submarines and torpedo underwater, precisely recognizing the characters and signals of underwater Target and then further promptly knowing well about the traces.
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