海底電磁水平正交激發(fā)源控制系統(tǒng)設(shè)計
發(fā)布時間：2019-07-01 18:06
【摘要】：作為一種新興的海洋地球物理探測方法,可控源電磁法在探測深海淺層天然氣水合物埋藏應(yīng)用方面具有成本低、準確率高的優(yōu)勢。當(dāng)前可控源電磁儀器中激發(fā)源信號發(fā)射方式廣泛使用單發(fā)射偶極拖曳式發(fā)射,現(xiàn)有人提出了一種新的水平正交電磁雙發(fā)射偶極,采用定點坐底式發(fā)射方法,相比原來的拖曳式發(fā)射方式具有對海底淺層構(gòu)造識別能力更高的優(yōu)勢。水平正交雙發(fā)射偶極激發(fā)源控制系統(tǒng)是可控源坐底式電磁發(fā)射機的核心控制功能實現(xiàn)部分,本文的研究內(nèi)容重點在于實現(xiàn)控制系統(tǒng)的以下幾大關(guān)鍵技術(shù):功耗控制管理技術(shù)、雙路電磁信號發(fā)射控制與方向切換技術(shù)、姿態(tài)俯仰橫滾方位角的測量技術(shù)、發(fā)射電磁信號記錄與數(shù)據(jù)時間標(biāo)識技術(shù)�？刂票O(jiān)測電路以LPC2368與EPM570T為核心,實現(xiàn)了系統(tǒng)內(nèi)部時間基準,同時兼具有過流、過壓報警功能,解決了姿態(tài)方位角測量與雙路電磁信號發(fā)射控制技術(shù);雙路電流信號采集電路以ARM7為核心,搭配USB接口總線轉(zhuǎn)換芯片CH375B,實現(xiàn)雙路電流采集并為數(shù)據(jù)附加時間信息數(shù)據(jù)記錄功能,記錄的數(shù)據(jù)最終被寫入儀器掛載的U盤;功耗控制電路以ATmega 8為控制核心,搭配相關(guān)電壓轉(zhuǎn)換電路,軟件包括基于AVR Studio平臺程序與上位機VC界面,可通過VC界面實現(xiàn)對各電壓轉(zhuǎn)換電路的控制,實現(xiàn)功耗控制管理功能�？刂葡到y(tǒng)軟件實現(xiàn)內(nèi)容還包括由CPLD分頻的本地秒脈沖信號和PPS的軟件同步和本地秒脈沖相對于PPS偏移量測量,本地秒脈沖和PPS軟件同步實現(xiàn)是CPLD在ARM7控制下通過VHDL程序完成。偏移量測量的實現(xiàn)是CPLD對偏移時間測量,傳輸協(xié)議將計數(shù)結(jié)果送給ARM7,ARM7對數(shù)據(jù)處理后反饋給上位機控制端�；诒驹O(shè)計的激發(fā)源控制系統(tǒng),研發(fā)了海洋可控源電磁坐底式發(fā)射機,并進行了相關(guān)海試工作,驗證了儀器的功能性和可靠性。初步實現(xiàn)海底水平正交激發(fā)源控制系統(tǒng)所需解決的幾大關(guān)鍵技術(shù),完成了系統(tǒng)預(yù)定的電磁信息發(fā)射采集等各項功能,滿足了淺層水合物的勘探需求。
[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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.325
本文編號：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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.325
【引證文獻】
相關(guān)會議論文 前1條
1 魏文博;鄧明;陳樂壽;譚捍東;金勝;鄧靖武;;海底大地電磁系統(tǒng)的研究[A];2001年中國地球物理學(xué)會年刊——中國地球物理學(xué)會第十七屆年會論文集[C];2001年
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