GNSS同步触发器在可控震源上的运用  

GNSS synchronous trigger on vibroseis.

作　　者：韩中华 李纪章 李二贵 法炜[1] 刘小峰[1] HAN Zhonghua;LI Jizhang;LI Ergui;FA Wei;LIU Xiaofeng

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司装备服务处,河北涿州072750

出　　处：《物探装备》2023年第4期240-243,共4页Equipment for Geophysical Prospecting

摘　　要：默认所有可控震源授时都是统一的GNSS标准时间没有误差。而实际上可控震源计时系统来源于授时的导航系统,每台震源车都有一个独立导航系统,各导航系统提供的授时是存在差异,在使用前需对其进行时间精度测试。本文介绍了一种GNSS同步触发器及其原理,用GNSS同步触发器测试每台导航之间的时间误差,排除偏差较大的导航,保障可控震源计时系统的一致性。使用箱体振动时产生的时间中断信号同时触发可控震源导航系统和GNSS同步触发器,并记录其时间,对比时间差值。正常时间误差在微秒级。By default,all vibroseis timing is the same GPS standard time without error.In fact,the vibroseis timing system(GPS standard time)comes from the navigation system of timing,each focal vehicle has an independent navigation system,the timing provided by the navigation system is different,and it needs to be tested for time accuracy before use.The GPS synchronous trigger is used to test the time error between each navigation,and the navigation with large deviation is eliminated to ensure the consistency of the vibroseis timing system.The time break signal(TB)generated by the box vibration triggers the vibroseis navigation system and GPS synchronization trigger at the same time,and records its time,and compares the time difference.Normal time error in microseconds.

关 键 词：计划时间 GNSS标准时间 可控震源计时系统 导航系统 时间精度 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P631.437[天文地球—测绘科学与技术]