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随着海洋经济的发展和近海生产活动的急增 ,我国近海约１／３海域均受到污染 ,特别是河口、海湾和近岸海区污染更加严重 ,需要对这些海区的海洋环境参数进行长期、同步、自动监测 ;在海洋军事上 ,准确、可靠的海洋环境数据是必不可少的战略服务资料 ,将大大提高海上作战能力。因此 ,国家８６３计划海洋监测技术 (８１８)主题的近海环境自动监测技术的课题中 ,列有海床基海洋环境自动监测系统的研究项目。该监测系统是置于水深大约５０ｍ的海底边界面上 ,用于监测海洋环境要素的装置。通过本课题的实施 ,将使我国的海洋环境立体自动监测技术… 相似文献
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Achieving reliable underwater communication in shallow water acoustic channels is a difficult because of the random time-varying nature of multipath propagation,severe amplitude fluctuation,and spatial variability of the channel conditions.This paper describes a new signal processing technique-frequency coding and decoding by means of real-time measurement of signal width,jamming and suppressing multipath interference and using redundant coder.The application of the technique to thd model ZTY-1 status monitor for underwater system of seabed is introduced in this paper.The main principle,the technique specifications and the key techniques of the system are discussed here.Theoretical estimations and experimental results proved that the performance of the system is excellent.The method can be used for some other related low-data-rate data transmission detecting in shallow water acoustic channel. 相似文献
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