| 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RS485实现了采集站与数传包的物理连接,利用LVDS、预加重/均衡器、8B/10B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FPGA内部采用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。 |
| 关键词: 深拖式 海洋地震勘探 实时传输 差错控制 任务队列 |
| DOI：10.11759/hykx20171031001 |
| 分类号:TN914.34;P738.4 |
| 基金项目:国家高技术研究发展计划（863计划）,国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| The Design and implementation of real-time transmission system for marine multichannel seismic streamer data |
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Qi hongxue1, Xiong xiaodong1, Pei yanliang2, Kan guangming3
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1.Electronic Information School,Yangtze University;2.Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration;3.Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,SOA
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| Abstract: |
| In order to meet the requirements of deep towed "high-resolution" multi-channel seismic exploration, a real-time transmission system of marine seismic streamer data is designed and implemented, which is composed of data transmission packets and seismic acquisition stations. In the design, the physical connection between seismic acquisition station and data transmission packet is realized by RS485, and the communication link among data transmission packets is achieved by using LVDS, pre-emphasis/equalizer, and 8B/10B encoding, etc. An error control method of wait-free feedback retransmission is designed to improve the efficiency and reliability of the system; In addition, the multistage pipeline design of multi priority task queue based on FIFO is built in FPGA, which solves the problem of data frame leakage caused by large volume data concurrency. After testing on the system with a known sinusoidal signal in the laboratory, the results show that the system meets the needs of multi-channel seismic data transmission, and has great significance for the reliable acquisition of multi-channel high-resolution seismic data. |
| Key words: Deep towed Marine seismic exploration Real-time transmission Error control Task queue |