陆上地震勘探数据同步采集与实时传输的设计与实现
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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 sampling 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.
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 sampling 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.
引文
[1]王超,宋克柱,唐进.高性能水下地震采集系统设计与实现[J].吉林大学学报:工学版,2007,37(1):168-172.
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[3]Peng Ruiqing.The optimization techniques for timesynchronization based on NTP[C].2ndInternationalConference on Future Computer and Communication,2010,2:296-299.
[4]P.Ferrari.Improving robustness of the synchronizationquality of IEEE1588 nodes[C].International IEEEsymposium on Precision Clock Synchronization forMeasurement Control and Communication,2010:36-41.
[5]R.Baldoni.Coupling-Based Internal Clock Synchro-nization for Large-Scale Dynamic Distributed System[J].IEEE Trans on Parallel and Distributed System,2010,21(5):607-619.
[6]M.Bogdan,D.Samtleb,K.Vanderlinde.Simultane-ous Sampling ADC Data Acquisition System for theQUIET Experiment[C].IEEE Nuclear Science Sym-posium Conference Record,2005,2:1077-1079.
[7]M.Shinagawa,Y.Akazawa,T.Wakimoto.Jitter A-nalysis of High-speed Sampling Systems[J].IEEEJournal of Solid-State Circuits,1990,25(1):220-224.
[8]王东旅,杨俊峰,程宏才.地震数据采集系统中的数据传输系统设计[J].数据采集与处理:工学版,2011,26(4):494-498.
[2]唐世悦,宋克柱,何正淼.长距离高精度采集系统的研究[J].电路与系统学报,2008,13(4):120-123.
[3]Peng Ruiqing.The optimization techniques for timesynchronization based on NTP[C].2ndInternationalConference on Future Computer and Communication,2010,2:296-299.
[4]P.Ferrari.Improving robustness of the synchronizationquality of IEEE1588 nodes[C].International IEEEsymposium on Precision Clock Synchronization forMeasurement Control and Communication,2010:36-41.
[5]R.Baldoni.Coupling-Based Internal Clock Synchro-nization for Large-Scale Dynamic Distributed System[J].IEEE Trans on Parallel and Distributed System,2010,21(5):607-619.
[6]M.Bogdan,D.Samtleb,K.Vanderlinde.Simultane-ous Sampling ADC Data Acquisition System for theQUIET Experiment[C].IEEE Nuclear Science Sym-posium Conference Record,2005,2:1077-1079.
[7]M.Shinagawa,Y.Akazawa,T.Wakimoto.Jitter A-nalysis of High-speed Sampling Systems[J].IEEEJournal of Solid-State Circuits,1990,25(1):220-224.
[8]王东旅,杨俊峰,程宏才.地震数据采集系统中的数据传输系统设计[J].数据采集与处理:工学版,2011,26(4):494-498.
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