基于地下VLF人工信号源的定位技术研究

Research on Localization Technology Based on Underground Artificial VLF Signal Source

摘要:

基于甚低频电磁波(VLF)穿透地层能力，研究地层对信号造成的影响，评估频率、功率和信号穿透能力的关系；从信号源、天线、信号处理滤波等方面讨论其实现的原理及关键技术；筛选适合地下-地表单向通信的合理方式和载波机制；建立简化的磁偶子定位模型，完成信号源的定向和定深。总结甚低频定位技术的关键方案，为煤层气水平井、水平对接孔、定向钻进导向孔、矿井救援等钻探领域中孔内信号传输提供一种新的通讯技术。

Abstract:

Based on the ability of VLF electromagnetic waves passing through the stratum, the study is made on the impact of the earth to signals to evaluate the relationship between the frequency, power and signal passing ability, discuss the realization principles of signal localization in signal source, antenna, signal processing and filtering as well as the key technologies, select a reasonable way and carrier mechanism for underground-surface communication, build a simplified magnetic dipole sub-localization model to complete the orientation and depth determination. This paper summarizes the key programs of very low frequency electromagnetic waves localization technology to provide a new communication technology for in-hole signal transmission in drilling field, such as CBM horizontal well, horizontal butted hole, pilot hole of directional drilling and mine rescue.