In this paper, the authors investigate localization accuracy of Ultra WideBand (UWB) radar with a minimal antenna array taking in the account complexity of the real environment (extended and multiple targets, presence of wall or other obstacle in the line of sight, practical restrictions of antenna setting). Simulation-based results show how the localization accuracy depends on the radar range resolution, deployment of the radar antennas and the accuracy of ranges estimated between transmitting antenna-target-receiving antenna. As the output, the distributions of the average localization errors in the monitored area are obtained.