In this paper, a new method of motionless person localization in 3-dimensional space (3D) by ultra wideband (UWB) radar will be introduced. The presented approach is based on the application of a multistatic UWB radar using one transmitting and four receiving antennas. The novel localization method is based on the approximation of 3D localization problem by solution of two 2D localization tasks. A proper lay-out of the radar antenna system will be introduced for the considered UWB radar applications. The performance properties of the outlined concept of 3D localization system have been evaluated by the experiments intent on indoor line-of-sight and through-the wall localization of motionless person.