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The existence of a multi-path channel under the water greatly decreases the accuracy of the short baseline positioning system.In this paper,the application of a time reversal mirror to the short baseline positioning system was investigated.The time reversal mirror technique allowed the acoustic signal to better focus in an unknown environment,which effectively reduced the expansion of multi-path acoustic signals as well as improved the signal focusing.The signal-to-noise ratio(SNR) of the time reversal operator greatly increased and could be obtained by ensonifying the water.The technique was less affected by the environment and therefore more applicable to a complex shallow water environment.Numerical simulations and pool experiments were used to demonstrate the efficiency of this technique. 相似文献
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从高速铁路接触网线缆运输货损货差出发,首先分析运输产生货损货差的主要原因及其本质,其次根据对货损货差具体原因的分析结果提出相应的改善措施,最后基于生产企业的视角提出企业在防止货损货差方面未来发展方向。 相似文献
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区域交通信息化、智能化已成为城市交通发展的必然趋势,各区域信息平台的构建结构正在探索当中.以杨浦区交通信息平台为例,研究依托区域交通信息平台实现区域交通的信息化和智能化的方法.面向三类平台使用者——社会公众、政府部门及行业技术部门,分析了杨浦区交通信息平台构建的需求,并详细介绍了信息平台的构架;提出四大子系统——基础交通信息采集子系统、信息共享与交换子系统、智能交通仿真子系统,以及交通信息服务子系统的架构,并详述其功能作用,为其他区域建立交通信息平台提供借鉴作用. 相似文献