@conference {214, title = {FPGA-based Implementation of an Ultrasonic Beacon for a Local Positioning System}, booktitle = {32nd IEEE International Annual Conference on Industrial Electronics, Control and Instrumentation (IECON 2006)}, volume = {CD}, year = {2006}, month = {11 / 2006}, pages = {1}, address = {Par{\'\i}s, Francia}, isbn = {1-4244-0136-4}, author = {Ana Jimenez and {\'A}lvaro Hern{\'a}ndez and Ure{\~n}a, J. and Marta Alonso and Carlos De Marzziani and Mar{\'\i}a del Carmen Perez and Manuel Mazo and Jos{\'e} Manuel Villadangos and J.J. Garcia and Fernando J. {\'A}lvarez} }