地磁传感器文章，包括EMS地磁传感器、地磁导航技术及其应用、基于磁传感器MMC212的电子指南针、基于地磁原理的计转数传感器技术研究、水平定向钻进随钻姿态测量及误差补偿-Geomagnetic sensor article, including EMS magnetic sensors, magnetic navigation technology and its applications, based on magnetic sens

论水平定向转的系统设计和控制硬件软件部分还有plc梯形图(On the design and control of the hardware and software of the horizontal directional rotation system and the PLC ladder diagram)