冰下水声信道特性及水声通信技术研究

北极区域极具战略意义与商业价值，受常年被冰层覆盖影响，民用或军事等冰下活动均迫切需要水声技术。然而我国对极地复杂、特殊的冰下信道以及极地水声技术研究近乎于空白。.面向冰下特殊声场条件的水声通信及潜在的网络化发展需求，本项目①开展冰水界面声学特性研究并建立冰下水声信道模型。②研究时反镜+循环前/后缀的OFDM以克服冰下信道强途径不是最先到达的信道结构难题，开发其高阶差分幅度相移键控技术以提高通信速率，并将OFDM与扩频相结合以提高稳健性和对多址通信的适用性；研制适用于极地环境的通信节点；通过冰区海试验证。③采用跨层设计，与冰下信道特性和物理层相匹配，提出基于信道预约和调度的自适应数据链路层介质访问控制协议，构建半实物网络仿真测试平台。.本项目将冰下水声物理基础研究与通信及其网络化技术相结合，为极地冰下信息传输提供新思路和有效技术手段，旨在为北极资源勘探或军事提供必要水声技术支撑。

The Arctic region has an important strategic meaning and business value, where under-ice civilian or military activities urgently require underwater acoustic technique because of the year-round ice cover. However, the research on complex and special polar under-ice channel and the polar underwater acoustic technology is almost blank in our country..To meet the requirement of acoustic communication thecnology and potential network development in the special under-ice sound field, the following research contents will be carried out: 1. Research on ice-water interface acoustic characteristics and modeling under-ice acoustic channel; 2. Research on polar OFDM under water acoustic communication technology with ice region experimental verification, including OFDM technology based on cyclic-prefix and cyclic-suffix combined with time reversal mirror, high order differential amplitude phase shift keying technology and OFDM combined with spread sepctrum technology, to improve the system performance and to solve the problem of the strongest path being not the first arrival in under-ice channel and developing the suitable communication node for the polar environment; 3. Proposing adaptive data link layer MAC protocol based on channel reservation and scheduling with cross-layer design to match under-ice channel and physical layer and building semi-physical network simulation testing platform..Aim at providing underwater acoustic technology for the necessary support of Arctic exploration or military activity, the project combines the under-ice acoustic physical basic research with acoustic communication and network technology, which provides new ideas and effective technical means for the information transmission in the polar under-ice area.