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人员精确定位系统可掌握井下作业人员数量、位置，不仅提高矿井管理水平而且有助于安全事故救援。文中就对山西某矿使用的 KJ251A 精确人员定位系统结构组成、工作原理、关键技术以及现场应用结果进行探讨。现场使用的人员精确定位系统不仅具备能耗低、技术先进优点，而且人员定位精度在 3.0m 以内，可满足矿井安全管理需要，现场取得较好应用成果。“,”the personnel accurate positioning system can grasp the number and location of underground workers, not only improve the mine management level, but also help to rescue safety accidents. This paper discusses the structure, working principle, key technology and field application results of KJ251a precise personnel positioning system used in a mine in Shanxi Province. The accurate personnel positioning system used on site not only has the advantages of low energy consumption and advanced technology, but also has the personnel positioning accuracy within 3.0m, which can meet the needs of mine safety management and achieve good application results on site.