中文摘要：

针对目前井下定位系统的现状和局限性，分析了井下地磁定位的3种关键技术，架构了一种基于地磁定位技术的井下定位导航平台。介绍了井下地磁场分布特点和基准建模数学方法，开展了唐山市冀东能源学校井下巷道磁场数据采集，内业处理和三维地磁场模型构建的仿真实验，建立了井下巷道小区域内地磁特征线的布设方法和三维建模的插分模型。实验表明：采用分段线性插值方法符合井下巷道磁场分布的收敛性，能在小区域内快速拟合，精度较高，可满足井下地磁定位的基准要求。

英文摘要：

According to the limitations and existing problems, three major technologies of underground magnetic positioning were analyzed, and a underground positioning navigation platform was built based on the magnetic positioning technology. The distribution characteristics of underground magnetic field and the modeling mathematical method of the benchmark figure were introduced. Then, the data collection and indoor processing of underground roadway magnetic field were carried out at Jidong energy school of Tangshan, as well as simulation experiments based on three dimensional geomagnetic field model. Besides, the way of setting up feature line in the underground roadway magnetic field and the three dimensional insert points model were built. The experiments suggested that the piecewise linear interpolation method conformed to the underground tunnel conver- gence of magnetic field distribution, which could fit as soon as possible in small area with high precision, and satisfy the ele- mentary requirement of the geomagnetic positioning.