【摘要】 设计了一种自容式数字水听器分布式水声测量系统。海洋声学测量系统由多个数字水听器连接构成,各个数字水听器通过电缆逐个相连,可以调整阵元的间隔和阵元个数。数字水听器可对采集获得的数据进行自容式存储或实时上传,优化设计了可高速串行数据传输的RS-485总线,采用8B/10B链路编码,利用串行信号的上升/下降的时钟边沿作为高速时钟采样的起始标志,实现了数据帧的提取,可实现串行编码数据沿双绞线以15MB/s远距离传输,并在总线上参考IEEE1588授时协议给出了一种基元同步方案,同步最大误差为0.5μs。最终通过海上试验证明:采集效果良好,系统工作可靠、整体功耗低,各个阵元同步准确,可以广泛应用于水下阵元测量领域。更多还原

【Abstract】 A self-contained ocean acoustic measurement system is designed in the form of vertical array,based on digital hydrophones.The system consists of multiple digital hydrophones,which are connected to each other via cable.The number of elements and distance between each element can be adjusted.The collected datas are either stored or uploaded in real time by digital hydrophones,and high-speed serial data transmission system is optimally designed based on RS-485 bus,rising/falling edges of serial signal enable bit synchronization time-clock recovery,and data frame is realized with the 8 B/10 B encoded mode,and bus provides remote data transmission along twisted-pair cable at the transmission rate of 15 MB/s,and a primitive synchronization scheme is also given on the bus in reference to IEEE 1588 timing protocol,whose synchronization the maximum error is 0.5 μs.Finally,tests prove that the acquisition effect is good,the system is reliable,with low overall power consumption and each array element is accurate and synchronous,and it can be widely used in underwater array element measurement.更多还原