Based in the current increment of the popularity of Indoor Positioning system (IPS) it has being designed and implemented a Wireless sensor network (WSN) in the Istituto Superiore Mario Boella (ISMB), based on the impulse radio Ultra-wideband (UWB) technology, given its high localization accuracy, low power consumption and los cost of implementation, all of this thanks to the fact that it supports higher data rates, extended range, it is robust against interference and It has centimeter accuracy about its ranging measurements of localization. This was implemented in a Real Time Locating System (RTLS) for a single area unit in the offices of the Pervasive Technologies area of the company.