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Most applications of underwater acoustic sensor networks (UASNs) rely upon accurate location information of target. However, the asynchronous clock and noise measurement characteristics of underwater environment make target localization more challenging as compared to the terrestrial sensor networks. In this paper, we design an asynchronous localization algorithm for UASNs, where the synchronous clock...
Underwater target tracking, which aims to achieve accurate position of underwater target, has been one of the key issues in the underwater research. However, due to the unique underwater environment such as extraneous interference and weak communication, how to realize the accurate tracking of underwater target becomes a challenging problem. In this paper, we are concerned with the problem of underwater...
In order to solve the problem of large space and time overhead in the PrefixSpan algorithm, a new sequential pattern mining algorithm based on PrefixSpan is proposed, which is PrefixSpan-x algorithm. The algorithm reduces unnecessary storage space and removes the non-frequent items, and combines AC automaton to optimize frequent sub-sequence mining, so as to improve the performance. Experiments prove...
We study the problem of joint relay selection and power allocation in a underwater cooperative system with multiple users assisted by multiple relays. Due to the harsh underwater environments, the channel state information (CSI) at the transmitter is imperfect, which leads to the performance degrading in the underwater cooperative acoustic system. Therefore, we analyze the cooperative underwater acoustic...
A method for 3-D seismic refraction tomography is presented. We have applied a new approach for processing 3D seismic refraction data using waveform modeling to image underground pipes using short channel spacing. This approach successfully obtained accurate high definition 3D ground model. More than 10 surveys were done to image underground pipes and voids. The purpose of this study is to test the...
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