陆上地震勘探数据同步采集与实时传输的设计与实现  

Design and Realization of Synchronous Sampling and Real-time Transmission in Land Seismic Data Acquisition System

作　　者：吴增海[1,2] 宋克柱[1,2] 杨俊峰[1,2] 曹桂平[1,2] 曹平[1,2] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026 [2]中科院核探测与核电子学国家重点实验室,合肥230026

出　　处：《核电子学与探测技术》2012年第11期1233-1237,1272,共6页Nuclear Electronics & Detection Technology

基　　金：国家863高技术研究发展计划资助项目(2006AA09A102-02)

摘　　要：针对陆上地震勘探的特点,设计并实现了节点数据同步采集和实时传输系统。一般传感器网络中,传感器节点往往采用本地时钟,并通过软件方法来进行补偿校准,但是由于本地时钟的初始相位不确定性,以及软件校准的局限,往往满足不了高分辨率的地震数据采集要求,故提出了基于时钟恢复和锁相环技术在硬件上实现系统时钟同步的方法,从而实现了节点间数据的同步采集。经过测试,相邻节点的采样时刻最多相差1ns,达到了同步采样的要求。同时系统基于串行/解串技术实现了远距离高速数据的实时传输。A synchronous sampling and real -time transmission system is developed for land seismic data acquisition system. Traditionally, each node uses a local oscillator as its sampling clock, and synchronous sampling between each node is tried by using software calibration algorithms. High resolution has been proven to be hard to achieve due to different initial local clock phases, accumulated clock jitter, and limited efficiency of the software. A synchronous sampling method based on clock recovery and Phase Locked Loop （PLL） is proposed in the paper to synchronize sampling for the wire sensor networks on hardware. Test results indicate that the achieved resolution of synchronous sampling is fixed after power - on with no accumulation effect, and the sampiing instant difference between two neighboring nodes is maximally 1 nanosecond in the worst case. At the same time, the long data transmission is realized based on serializer/deserializer technology.

关 键 词：地震勘探 同步采集 数据传输 现场可编程门阵列 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]