本文選題：可控源音頻大地電磁法 + 高精度采集　； 參考：《吉林大學》2014年碩士論文

【摘要】：新型工業(yè)化和城鎮(zhèn)化的高速發(fā)展致使我國資源不足和環(huán)境污染問題日益突出，這對地球物理方法的應用提出了迫切需求，集中表現(xiàn)為：（1）淺層礦產(chǎn)資源開采殆盡，急需開辟第二找礦空間；（2）工程物探需求量巨大；（3）環(huán)境地質(zhì)問題日益突出，環(huán)境物探意義凸顯。地球物理的基礎(chǔ)是觀測，而地球物理勘探儀器是關(guān)鍵，地球物理技術(shù)與地球物理儀器是相互促進和相互發(fā)展的。但是，，我國在具有大探測深度范圍的可控源音頻大地電磁法（Controlled SourceAudio-frequency Magnetotelluric，CSAMT）儀器方面高度依賴，缺乏關(guān)鍵裝備的自主研究開發(fā)能力，給電磁勘探新方法、新理論的研究帶來很大的限制，嚴重阻礙我國電磁法勘探的持續(xù)發(fā)展，成為我國地球物理學科發(fā)展的瓶頸。本文通過研制具有自主知識產(chǎn)權(quán)的網(wǎng)絡化可控源音頻大地電磁法接收系統(tǒng)，縮小了與國外同類儀器的差距，為解決我國城鎮(zhèn)化和工業(yè)化遇到的接替資源不足、環(huán)境地質(zhì)與工程地質(zhì)問題提供了地球物理勘探裝備保障。 本文圍繞網(wǎng)絡化可控源音頻大地電磁法接收系統(tǒng)的關(guān)鍵技術(shù)進行研究，分為四個部分：1.高精度同步數(shù)據(jù)采集技術(shù)研究，設計了低噪聲模擬信號調(diào)理電路，采用了高精度模數(shù)轉(zhuǎn)換器，并通過數(shù)字濾波提高過采樣比，實現(xiàn)了高分辨率采集。數(shù)字部分采用FPGA和USB控制器進行構(gòu)建，開發(fā)了USB控制器的驅(qū)動程序，編寫了動態(tài)鏈接庫和上位機應用程序。利用GPS秒脈沖作為同步觸發(fā)信號，編寫了同步掃頻程序。2.基于偽隨機系統(tǒng)辨識的標定技術(shù)，以逆重復m序列作為標定信號，利用系統(tǒng)辨識獲取儀器和傳感器的頻率特性，通過自動標定提高系統(tǒng)測量的精度。3.基于GPRS的網(wǎng)絡化技術(shù)，利用GPRS進行儀器通信和遠程監(jiān)控，采用Socket編寫了監(jiān)控中心服務器程序。4.與國外先進儀器進行了對比，并開展了多次野外勘探應用，結(jié)果表明本系統(tǒng)滿足CSAMT高精度測量要求。
[Abstract]:The rapid development of industrialization and urbanization in our country natural resources shortage and environmental pollution problems have become increasingly prominent, the urgent needs of the application of geophysical method, focused on the following: (1) the shallow mineral resources depleted, it is urgent to open up second prospecting space; (2) engineering geophysical exploration in great demand; (3) environmental geological problems have become increasingly prominent, highlighting the environmental geophysical significance. Basic geophysical observations, and geophysical prospecting instrument is the key, geophysical technology and geophysical instrument is mutual promotion and development. However, in our country, controlled source audio frequency magnetotelluric method has high detection depth range (Controlled SourceAudio-frequency Magnetotelluric. CSAMT) instrument is highly dependent on the independent research and development ability, lack of key equipment, a new method for electromagnetic exploration, research on new theories have brought great limitations, serious Hinder the sustainable development of electromagnetic prospecting in China, has become China's development of Geophysics bottleneck. Network controlled source audio frequency magnetotelluric method this paper developed with independent intellectual property rights of the receiving system, reduces the gap with foreign instrument, in order to solve the resources encountered in China's urbanization and industrialization, provides geophysical exploration equipment to protect geological environment and engineering geological problems.
Study on the key technology based on network CSAMT receiving system, is divided into four parts: 1. research on high precision synchronous data acquisition technology, the design of low noise analog signal conditioning circuit, the high precision analog-to-digital converter, and through digital filtering to improve the sampling rate and realize high resolution acquisition. The digital part is constructed by FPGA and USB controller, the USB controller driver development, compile the dynamic link library application and PC program. Using GPS as the second pulse synchronous trigger signal, write synchronization.2. sweep program pseudo random calibration technology based on system identification, the inverse repeat m sequence as the calibration frequency signal. The characteristics of obtaining instruments and sensors by using system identification, automatic calibration to improve the accuracy of.3. measurement system based on GPRS network technology, through the use of GPRS instrument Letter and remote monitoring, the monitoring center server program.4. has been contrasted with foreign advanced instruments by Socket, and many field exploration applications have been carried out. The results show that the system meets the requirements of CSAMT high precision measurement.

【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P631.325

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