The invention relates to a seismic data acquisition technology of a wired telemetry seismograph. Petroleum seismic exploration requires tens of thousands of seismic wave acquisition stations on the exploration network to start data acquisition at the same time, and the error between them is less than 20us. Generally, there are thousands of acquisition stations in series on each seismic survey line, and each acquisition station has a certain delay in transmitting commands. There is a delay of at least a few ms from the command sent by the cross station to the last acquisition station on the survey line, which is far greater than the synchronous accuracy required by seismic exploration. How to eliminate the influence of transmission delay and realize high precision time synchronization is one of the key technologies of digital seismograph. The invention designs a high-precision time synchronization technology of a wired telemetry digital seismograph. A series of synchronous command chain is sent from the cross station, so that each synchronous sub command can reach the corresponding acquisition station at the same time, so that thousands of acquisition stations on the seismic survey line can achieve accurate synchronization, and the synchronization error can be reduced to several US. The synchronization scheme of the invention is not limited by the inherent transmission delay length of the acquisition station and the number of series acquisition stations on the measuring line, and is simple and easy.
【技术实现步骤摘要】
一种有线遥测数字地震仪的高精度时间同步技术
本专利技术涉及有线遥测地震仪的地震数据采集技术。
技术介绍
有线遥测数字地震仪的勘探网络基本都按图1所示的拓扑结构布网。图1中垂直方向的电缆是交叉线,交叉线上的灰色菱形代表交叉站。水平方向的平行线1,2,3,4是地震测线,地震测线上的灰色方块代表电源站,黑色圆点代表地震波采集站。每条地震测线上串联了几千个采集站,负责采集地震数据。多条水平测线可组成含有几万个采集站的地震勘探网络。野外施工时中央站给交叉线上的所有交叉站发送启动地震数据采集的同步命令,交叉站再将同步命令转发给水平测线上的采集站。由于每个采集站转发命令至少有几个us的延时,如果测线上串联了1000个采集站,当从交叉站出发的命令传播到测线上的最后一个采集站时,就会产生几个ms的时差,远远超过地震数据采集<20us的同步精度要求。所以如何实现所有采集站AD转换器的精确时间同步始终是数字地震仪研制中的一道难题。
技术实现思路
本专利技术提出一种简便的精确时间同步方法,可有效消除测线上每个采集站 ...
【技术保护点】
1.一种用发送同步子命令串的方法实现地震测线上采集站的高精度时间同步技术。/n
【技术特征摘要】
1.一种用发送同步子命令串的方法实现地震测线上采集站的高精度时间同步技术。
2.一种给...
【专利技术属性】
技术研发人员:郝学元,宋志翔,王剑,宋祈真,
申请(专利权)人:南京相同轴网络科技有限公司,
类型:发明
国别省市:江苏;32
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