【摘要】 为满足深拖式高分辨多道地震勘探需求,设计并实现了海洋地震拖缆数据的实时传输系统。系统由数传包与地震采集站连接组成,采用推荐标准485(Recommended Standards 485,RS485)串行总线实现了采集站与数传包的物理连接,利用低电压差分信号(Low-Voltage Differential Signaling,LVDS)、预加重/均衡器、8位/10位(8 bit/10 bit)编码等技术实现了数传包之间的通信链路。设计了无等待反馈重传的差错控制方法,提高系统高效性和可靠性;在现场可编程门阵列(Field Programmable Gate Array,FPGA)内部采用先进先出(First Input First Output,FIFO)构建多优先级任务队列的多级流水线设计,解决了大容量数据并发而产生的数据漏帧问题。在实验室用已知正弦信号对系统进行了对比测试,结果表明系统能够满足海洋多道地震勘探的数据传输需求,对于海洋多道高分辨率地震资料的可靠获取具有重要的意义。更多还原

【Abstract】 To meet the requirements of deep-towed "high-resolution" multichannel seismic exploration, a real-time transmission system of marine seismic streamer data comprising data transmission packets and seismic acquisition stations, is designed and implemented. In the design, the physical connection between seismic acquisition station and data transmission packet is realized using RS485, and the communication link among data transmission packets is achieved using low-voltage differential signaling, pre-emphasis/equalizer, 8 bit/10 bit encoding, and other technologies. An error-control method of wait-free feedback retransmission is designed to improve the system efficiency and reliability. In addition, the multistage pipeline design of multi-priority task queue based on first-in, first-out is built in a Field Programmable Gate Array, which solves the problem of data frame leakage caused by large-volume data concurrency. After testing the system with a known sinusoidal signal in the laboratory, the results show that the system meets the requirements of multichannel seismic data transmission and has great significance for the reliable acquisition of multichannel high-resolution seismic data.更多还原