控制海底电磁激发脉冲发射的时间同步技术  

The technique of time synchronization operation to control marine electromagnetic emission

作　　者：王猛[1] 邓明[1] 张启升[1] 陈凯[1] 崔金岭[1] 

机构地区：[1]中国地质大学(北京)地下信息探测技术与仪器教育部重点实验室,北京100083

出　　处：《地球物理学进展》2009年第4期1493-1498,共6页Progress in Geophysics

基　　金：国家"863"重大项目课题项目课题--天然气水合物的海底电磁探测技术(2006AA09A201);国家"893"计划项目课题--坑(井)地电阻率成像技术及系统研制(2007AA06Z130)资助

摘　　要：为达到海洋可控源电磁探测和远参考测量的目的,研究控制海底电磁激发脉冲发射的时间同步技术,包括发射前与GPS的对钟技术和发射中的同步技术,保证仪器工作的时间和公共的时间基准GPS信号保持精确一致,为后期的数据处理解释提供统一的时间坐标.对钟技术是指,在海洋调查船上完成仪器内部RTC芯片分频所得的秒脉冲信号RTC_PPS与GPS秒脉冲信号PPS时钟沿的同步;同步技术是指,海底工作过程中,仪器在预定的时钟沿将可控源信号精确发射出去.本论文采用CPLD芯片、RTC芯片、GPS模块和AVR单片机来完成对钟和同步模块的设计.In order to measure the marine controlled source electromagnetism and realize the remote reference detection, the technique of time synchronization operation to control marine electromagnetic emission is needed, insuring that the internal clock in the instrument is according to the GPS clock and providing the same time reference for the data processing. The lock GPS is that, the synchronization operation between the RTC_PPS which is from RTC and PPS that is from GPS on the investigative ship. The synchronization operation is the exact emitting operation at the right time in the working process. These modules are designed by CPLD chip, RTC chip, GPS module and AVR microcontroller.

关 键 词：海洋可控源电磁 GPS对钟 同步 

分 类 号：P631[天文地球—地质矿产勘探]