摘要
加紧研究和发展海洋可控源电磁法(MCSEM)对我国海域能源资源的调查具有重要意义.在MCSEM勘探中,发射机记录的电流波形若没有精确时间标记,则无法与接收机采集到的数据进行同步处理,进而影响到感应电磁场相位信息的提取.本文对海底环境下发射电路所面临的这一亟需解决的特殊问题展开了研究.采用硬件同步分频和超长计数的时间标识技术,基于LPC2368微处理器、GPS对钟电路、高精度温度补偿晶振、CPLD、RTC模块、USB移动硬盘、霍尔电流传感器及其外围电路等搭建的新硬件平台,将高精度时间标记脉冲计数值连同发射电流波形数据一同记录至存储设备中,同时上传至甲板端,便于上位机对水下发射机进行远程监控.最后依托国家专项进行了海洋试验,验证了高精度时间标识技术的可靠性和准确性.
Intensify research and development of marine controlled-source electromagnetic method（MCSEM）are very important to the energy resources survey on Chinese waters.In the MCSEM exploration,if there is no exact record of the time stamp on the current wave of the transmitter,it cannot be synchronized with the data collected by the receiver,which affects the extraction of the information on electromagnetic induction phase.This paper has studied the particular problem needed to solve,which is faced by transmitting circuit launched under the seabed environment.Using hardware synchronization divider and long counting time stamp technology, based LPC2368 microprocessor,GPS for clock circuits,high precision temperature compensated crystal oscillator, CPLD, RTC module,USB mobile hard disk,the Hall current sensor and the new hardware platform which is built by its peripheral circuits and other structures,the count values of high-precision time stamping pulse along with the emission current waveform data are recorded to the storage device and simultaneously uploaded to the deck side,which facilitates PC to remote monitor the underwater transmitter.Finally,relying on the national special the sea trial has been carried out to verify the reliability and accuracy of high-precision time stamp technology.
出处
《地球物理学进展》
CSCD
北大核心
2015年第4期1912-1917,共6页
Progress in Geophysics
基金
国家高技术研究发展计划(863)(2006AA09A201
2009AA09A201
2012AA09A201
2014AA06A603)
中国地质调查局项目(201100307)
中央高校基本科研业务费专项(2652011271)
地下信息探测技术与仪器教育部重点实验室(中国地质大学,北京)基本科研业务费课题项目(GDL1304)
中国科学院科研装备研制项目等联合资助
关键词
海洋可控源电磁法
发射电流
超长时间计数
高精度时间标识
MCSEM
transmitter
transmission current
long counting time technology
high precision time stamp technology
