Abstract
This master project presents research on the subject of indoor localization systems intended for the localization of humans. Based on this research, a system is proposed and implemented. The system is based on wireless sensor network and ultra wide-band radar technology. Wireless communication is performed through Bluetooth low energy links. The implementation emphasize scaling, sensor node coordination, energy consumption and accuracy. Extension of features is also an important topic in this project, especially respiration monitoring and reliable presence sensing. Localization is performed by a scaleable multi-lateration algorithm. The system provides accurate results within a 0.5 meter radius with a precision of 86\%. We conclude with a successful implementation and provide discussions on potential usages and additional features.