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Study on Underwater Acoustic Communication Simulation Technique and Channels Estimation Algorithm for Environmental Monitoring in Far-reaching Sea

Author: ZhouLin
Tutor: LiHuaJunï¼›WangJianGuo
School: Ocean University of China
Course: Port, Coastal and Offshore Engineering
Keywords: Marine monitoring Underwater acoustic communication Channel estimation Fourier transform Semi-physical simulation In the application download
CLC: TN929.3
Type: PhD thesis
Year: 2011
Downloads: 237
Quote: 0
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Abstract


With the in-depth implementation of the National Oceanic and development strategy, the state began to advance, deepen the shallow water on the basis of the strategic plan of the far-reaching the sea. Underwater acoustic communication technology will play an increasingly large role in marine environmental monitoring and marine engineering. Limitations of RF communication, optical communication and wireless communication in underwater applications, underwater acoustic communication underwater currently the only viable long-distance wireless communication means, communication and positioning of underwater operations equipment in marine engineering, marine environmental monitoring, the exploration of marine resources, marine environment monitoring, marine disaster prevention, the marine military defense has a broad application prospects. In recent years, the theory and technology of underwater acoustic communication become the hotspot of academic research. Traction of the huge demand, the study of underwater acoustic communication networks, underwater acoustic sensor networks are starting to expand, more mature wireless communication scheme on land has also been applied to the study of underwater acoustic communication. However, due to the underwater acoustic channel is a land-based radio frequency channels, satellite channels much worse wireless channels with large delay and strong time-varying, high noise, multipath, Doppler shift serious features. Existing wireless communication solutions can not be directly applied to underwater acoustic communication system. The complexity of the underwater acoustic channel is a key factor restricting the development of underwater acoustic communication. In addition, the test of the underwater acoustic communication research with a high degree of complexity and professionalism of its pilot there laying difficulties, long test cycle risks, uncertainties and other issues. These issues objectively led to the study of underwater acoustic communication cycle is rather long and low efficiency, and has also become a key factor restricting the development of underwater acoustic communication. Above background, this article in the National High Technology Research and Development Program topics \, to carry out the underwater acoustic channel is estimated algorithms and underwater acoustic communication semi-physical simulation method of the research work, mainly innovative work as follows: 1) for underwater acoustic letter channel's characteristics and different application conditions, proposed a based on fractional Fourier transform water sound channel parameter estimation algorithm can also estimate the number of channel diameter, delay and frequency offset, has the advantages of high accuracy and high computational efficiency. 2) underwater acoustic communications semi-physical simulation platform HLSP / UWAC design is proposed and implemented. HLSP / UWAC to the the SOPC Technology, VC, Matlab underwater acoustic modems can be configured to support technology based SOPC technology as the core, integrated simulation algorithm assessment algorithm loaded, the collection of field testing, four underwater acoustic waveform storage subsystem with The high degree of automation, easy to expand, based on the real underwater acoustic channel, shield the underlying complexity of hardware design and communication system simulation and realization of complementary, specific realization. In the the support CDMA mechanism of underwater acoustic direct sequence spread spectrum communication system, the application, HLSP / UWAC can effectively improve the efficiency of underwater acoustic communication technology. 3) a based on the the SOPC technology of remote application programming (IAP) design is proposed and implemented. The update process for underwater acoustic communication field level test test repeated disassembly the watertight equipment efficiency, the problem of the high failure rate, in order to improve efficiency, reduce field test failure rate target, according to the characteristics of SOPC system proposed underwater acoustic communications field test trials remote in applications programming system design and support of high-speed wireless communications technology WiFi design implementation.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Underwater communication ( Sonar communication)
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