Zaied, Salah: UWB Localization of people-accuracy aspects Zusammenfassung UWB sensors feature very large bandwidth. This bandwidth allows very accurate localization of tag-free targets such as people. In this case, an UWB localization system localizes tag-free by means of backscattered electromagnetic waves. There exist different localization approaches. The thesis concerns with the accuracy aspects of time-of-arrival based localization approaches. The thesis provides different solutions to the localization problem which is mathematically described by a system of two dimensional nonlinear equations of the second order like. These solutions cover: Taylor series linearization, intersection of ellipses and the spherical interpolation. The thesis analyses performance of these localization approaches in different simulation scenarios. The principal component analysis was used to evaluate precision of these localization approaches. .