地震数据采集中的数据汇聚系统设计
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摘要
提出了一种地震数据采集系统中的高速数据汇聚系统设计。系统以CPCI机箱为框架,利用机箱插卡可插拔性和背板高速PCI总线来实现灵活改变系统的通道数量和数据的快速汇聚,通过DMA传输来简化CPU工作并提高数据汇聚速度,通过大容量缓存消除数据汇聚死时间且提高数据传输效率。最终实现的系统可以满足4缆共7 680道数据采集系统的数据汇聚要求。本系统结构简洁灵活,数据汇聚速度高,实时性好,能够应用于其他相关大型数据采集系统中。
A high speed data gathering system is designed for the seismic data acquisition system.(CPCI) crate is adopted as the framework of the data gathering system.The number of the sample channels can be easily changed by plugging in or out the cards of CPCI crate.Data can be gathered with high speed through the PCI bus of the CPCI crate.The use of(DMA) transferring simplifies the system control and improves the data gathering speed from multi-cards.Large cache is used to eliminate the dead time of data gathering and increase the efficiency of DMA transaction.The experiment shows that the system can satisfy the requirements for data gathering of a system four-cable system with totally 7 680 channels.The system features simple structure,high speed of data transferring,high performance of real-time data gathering.Moreover,it can be easily applied to other large-scale data acquisition systems.
A high speed data gathering system is designed for the seismic data acquisition system.(CPCI) crate is adopted as the framework of the data gathering system.The number of the sample channels can be easily changed by plugging in or out the cards of CPCI crate.Data can be gathered with high speed through the PCI bus of the CPCI crate.The use of(DMA) transferring simplifies the system control and improves the data gathering speed from multi-cards.Large cache is used to eliminate the dead time of data gathering and increase the efficiency of DMA transaction.The experiment shows that the system can satisfy the requirements for data gathering of a system four-cable system with totally 7 680 channels.The system features simple structure,high speed of data transferring,high performance of real-time data gathering.Moreover,it can be easily applied to other large-scale data acquisition systems.
引文
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[5]Li Ming,Yuan Zi,Jiang Chunlan.Design of seismicdata acquisition system[C]//10th InternationalConference on Signal Processing.Beijing,China:[s.n.],2010:2580-2583.
[6]Tian Jingwen,Gao Meijuan,Zhou Hao.Multi-channel seismic data synchronizing acquisitionsystem based on wireless sensor network[C]//IEEEInternational Conference on Networking,Sensing andControl,ICNSC 2008.Beijing:Beijing UnionUniversity,2008:1269-1272.
[7]宋克柱,杨俊峰,曹平,等.海洋物探地震数据采集与记录系统[J].吉林大学学报:工学版,2010,40(3):885-887Song Kezhu,Yang Junfeng,Cao Ping,et al.Marinegeophysical seismic data acquisition and recordingsystem[J].Journal of Jilin University:EngineeringScience,2010,40(3):885-887.
[8]张楠,张佩珩,刘新春.基于FPGA的DDR SDRAM控制器设计与实现[J].计算机工程与应用,2006,42(24):87-90.Zhang Nan,Zhang Peiheng,Liu Xinchun.DDRSDRAM controller design and implementation basedon FPGA[J].Computer Engineering andApplications,2006,42(24):87-90.
[9]General Electric Company.CR9,CP9,CT9 hardwareuser′s manual[EB/OL].Edition 2.6.http://www.ge-ip.com/products/702,2004-07-01/2011-06-24.
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[11]Wind River Inc.VxWorks reference manual[EB/OL].http://www-cdfonline.fnal.gov/daq/commercial/vxworks.pdf,1998/2010.
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