@conference {754, title = {Ultrasonic Positioning System by using UWB techniques}, booktitle = {2009 IEEE Conference on Emerging Technologies \& Factory Automation (ETFA 2009)}, year = {2009}, month = {09/2009}, pages = {1-4}, author = {E. Garc{\'\i}a and J.J. Garcia and {\'A}lvaro Hern{\'a}ndez and A. Jim{\'e}nez and Ure{\~n}a, J. and Daniel Ruiz and Mar{\'\i}a del Carmen P{\'e}rez} }