海底电磁水平正交激发源控制系统设计
发布时间：2019-07-01 18:06
【摘要】：作为一种新兴的海洋地球物理探测方法,可控源电磁法在探测深海浅层天然气水合物埋藏应用方面具有成本低、准确率高的优势。当前可控源电磁仪器中激发源信号发射方式广泛使用单发射偶极拖曳式发射,现有人提出了一种新的水平正交电磁双发射偶极,采用定点坐底式发射方法,相比原来的拖曳式发射方式具有对海底浅层构造识别能力更高的优势。水平正交双发射偶极激发源控制系统是可控源坐底式电磁发射机的核心控制功能实现部分,本文的研究内容重点在于实现控制系统的以下几大关键技术:功耗控制管理技术、双路电磁信号发射控制与方向切换技术、姿态俯仰横滚方位角的测量技术、发射电磁信号记录与数据时间标识技术。控制监测电路以LPC2368与EPM570T为核心,实现了系统内部时间基准,同时兼具有过流、过压报警功能,解决了姿态方位角测量与双路电磁信号发射控制技术;双路电流信号采集电路以ARM7为核心,搭配USB接口总线转换芯片CH375B,实现双路电流采集并为数据附加时间信息数据记录功能,记录的数据最终被写入仪器挂载的U盘;功耗控制电路以ATmega 8为控制核心,搭配相关电压转换电路,软件包括基于AVR Studio平台程序与上位机VC界面,可通过VC界面实现对各电压转换电路的控制,实现功耗控制管理功能。控制系统软件实现内容还包括由CPLD分频的本地秒脉冲信号和PPS的软件同步和本地秒脉冲相对于PPS偏移量测量,本地秒脉冲和PPS软件同步实现是CPLD在ARM7控制下通过VHDL程序完成。偏移量测量的实现是CPLD对偏移时间测量,传输协议将计数结果送给ARM7,ARM7对数据处理后反馈给上位机控制端。基于本设计的激发源控制系统,研发了海洋可控源电磁坐底式发射机,并进行了相关海试工作,验证了仪器的功能性和可靠性。初步实现海底水平正交激发源控制系统所需解决的几大关键技术,完成了系统预定的电磁信息发射采集等各项功能,满足了浅层水合物的勘探需求。
[Abstract]:As a new marine geophysical detection method, controllable source electromagnetic method has the advantages of low cost and high accuracy in detecting deep sea shallow gas hydrate burying. At present, the single emission dipole towed emission is widely used in the excitation source signal transmission mode of controllable source electromagnetic instruments. A new horizontal orthogonal electromagnetic double emission dipole has been proposed, and the fixed point sitting bottom emission method is adopted. Compared with the original towed emission method, the towed emission method has the advantage of higher recognition ability for the shallow structure of the seafloor. Horizontal orthogonal double transmit dipole excitation source control system is the core control function of controllable source sitting bottom electromagnetic transmitter. The research content of this paper focuses on the following key technologies of the control system: power consumption control management technology, dual electromagnetic signal transmission control and direction switching technology, attitude pitch transverse roll azimuth measurement technology, transmit electromagnetic signal recording and data time identification technology. The control and monitoring circuit takes LPC2368 and EPM570T as the core, realizes the internal time reference of the system, and has the functions of overcurrent and overvoltage alarm, which solves the problem of attitude azimuth measurement and dual electromagnetic signal transmission control technology. The dual current signal acquisition circuit is based on ARM7, and the dual current acquisition and additional time information data recording function are realized with USB interface bus conversion chip CH375B,. The recorded data is finally written into the U disk mounted by the instrument. The power consumption control circuit takes ATmega 8 as the control core and matches the related voltage conversion circuit. The software includes the VC interface based on AVR Studio platform program and the upper computer. The control of each voltage conversion circuit can be realized through the VC interface, and the power consumption control and management function can be realized. The software implementation of the control system also includes the local second pulse signal of CPLD frequency division and the software synchronization of PPS and the measurement of local second pulse relative to PPS offset. The synchronization realization of local second pulse and PPS software is completed by VHDL program under the control of ARM7. The realization of offset measurement is that CPLD measures offset time, and the transmission protocol sends the counting results to ARM7,ARM7 for data processing and feedback them to the upper computer control terminal. Based on the excitation source control system designed in this paper, the electromagnetic sitting bottom transmitter of marine controllable source is developed, and the related sea test work is carried out to verify the functionality and reliability of the instrument. Several key technologies to be solved in the horizontal orthogonal excitation source control system of the seafloor are preliminarily realized, and the predetermined electromagnetic information emission and acquisition functions of the system are completed, which meets the exploration requirements of shallow hydrate.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
本文编号：2508692
[Abstract]:As a new marine geophysical detection method, controllable source electromagnetic method has the advantages of low cost and high accuracy in detecting deep sea shallow gas hydrate burying. At present, the single emission dipole towed emission is widely used in the excitation source signal transmission mode of controllable source electromagnetic instruments. A new horizontal orthogonal electromagnetic double emission dipole has been proposed, and the fixed point sitting bottom emission method is adopted. Compared with the original towed emission method, the towed emission method has the advantage of higher recognition ability for the shallow structure of the seafloor. Horizontal orthogonal double transmit dipole excitation source control system is the core control function of controllable source sitting bottom electromagnetic transmitter. The research content of this paper focuses on the following key technologies of the control system: power consumption control management technology, dual electromagnetic signal transmission control and direction switching technology, attitude pitch transverse roll azimuth measurement technology, transmit electromagnetic signal recording and data time identification technology. The control and monitoring circuit takes LPC2368 and EPM570T as the core, realizes the internal time reference of the system, and has the functions of overcurrent and overvoltage alarm, which solves the problem of attitude azimuth measurement and dual electromagnetic signal transmission control technology. The dual current signal acquisition circuit is based on ARM7, and the dual current acquisition and additional time information data recording function are realized with USB interface bus conversion chip CH375B,. The recorded data is finally written into the U disk mounted by the instrument. The power consumption control circuit takes ATmega 8 as the control core and matches the related voltage conversion circuit. The software includes the VC interface based on AVR Studio platform program and the upper computer. The control of each voltage conversion circuit can be realized through the VC interface, and the power consumption control and management function can be realized. The software implementation of the control system also includes the local second pulse signal of CPLD frequency division and the software synchronization of PPS and the measurement of local second pulse relative to PPS offset. The synchronization realization of local second pulse and PPS software is completed by VHDL program under the control of ARM7. The realization of offset measurement is that CPLD measures offset time, and the transmission protocol sends the counting results to ARM7,ARM7 for data processing and feedback them to the upper computer control terminal. Based on the excitation source control system designed in this paper, the electromagnetic sitting bottom transmitter of marine controllable source is developed, and the related sea test work is carried out to verify the functionality and reliability of the instrument. Several key technologies to be solved in the horizontal orthogonal excitation source control system of the seafloor are preliminarily realized, and the predetermined electromagnetic information emission and acquisition functions of the system are completed, which meets the exploration requirements of shallow hydrate.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
【引证文献】
相关会议论文 前1条
1 魏文博;邓明;陈乐寿;谭捍东;金胜;邓靖武;;海底大地电磁系统的研究[A];2001年中国地球物理学会年刊——中国地球物理学会第十七届年会论文集[C];2001年
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