Abstract: Considering an urgent need for accurate indoor positioning services for the intelligent operation and maintenance management of the cabinet room data center, and the non-line-of-sight propagation error significantly reduces the traditional indoor positioning accuracy in the complex environment where the metal shielding, electromagnetic radiation and other equipment are seriously interfered in cabinet room, an indoor three-dimensional trilateral algorithm that uses the optimization theory principle and K-nearest neighbor to resist the non-line-of-sight propagation error is proposed. Based on this positioning algorithm, an indoor positioning system in the cabinet room based on ultra-wideband technology is designed and developed, which can be used for indoor positioning and navigation in complex cabinet room. Experiments have proved that the positioning system has higher positioning accuracy than Wi-Fi and bluetooth finger indoor position. In Addition, it performs well in a complex cabinet room environment with the combination of the optimization method of objective function based on nonlinear least square method and KNN algorithm. It provides an effective method and means for the location service of intelligent operation and maintenance of cabinet room data center.

Key words: non-line-of-sight(NLOS), ultra-wideband(UWB), indoor positioning of cabinet room, optimize, positioning system