网络化可控源音频大地电磁法接收系统关键技术研究

发布时间：2018-04-15 07:25

本文选题：可控源音频大地电磁法 + 高精度采集　；参考：《吉林大学》2014年硕士论文

【摘要】：新型工业化和城镇化的高速发展致使我国资源不足和环境污染问题日益突出，这对地球物理方法的应用提出了迫切需求，集中表现为：（1）浅层矿产资源开采殆尽，急需开辟第二找矿空间；（2）工程物探需求量巨大；（3）环境地质问题日益突出，环境物探意义凸显。地球物理的基础是观测，而地球物理勘探仪器是关键，地球物理技术与地球物理仪器是相互促进和相互发展的。但是，，我国在具有大探测深度范围的可控源音频大地电磁法（Controlled SourceAudio-frequency Magnetotelluric，CSAMT）仪器方面高度依赖，缺乏关键装备的自主研究开发能力，给电磁勘探新方法、新理论的研究带来很大的限制，严重阻碍我国电磁法勘探的持续发展，成为我国地球物理学科发展的瓶颈。本文通过研制具有自主知识产权的网络化可控源音频大地电磁法接收系统，缩小了与国外同类仪器的差距，为解决我国城镇化和工业化遇到的接替资源不足、环境地质与工程地质问题提供了地球物理勘探装备保障。本文围绕网络化可控源音频大地电磁法接收系统的关键技术进行研究，分为四个部分：1.高精度同步数据采集技术研究，设计了低噪声模拟信号调理电路，采用了高精度模数转换器，并通过数字滤波提高过采样比，实现了高分辨率采集。数字部分采用FPGA和USB控制器进行构建，开发了USB控制器的驱动程序，编写了动态链接库和上位机应用程序。利用GPS秒脉冲作为同步触发信号，编写了同步扫频程序。2.基于伪随机系统辨识的标定技术，以逆重复m序列作为标定信号，利用系统辨识获取仪器和传感器的频率特性，通过自动标定提高系统测量的精度。3.基于GPRS的网络化技术，利用GPRS进行仪器通信和远程监控，采用Socket编写了监控中心服务器程序。4.与国外先进仪器进行了对比，并开展了多次野外勘探应用，结果表明本系统满足CSAMT高精度测量要求。
[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.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P631.325

【参考文献】