@conference {, title = {Technical Description of Locate_US: an Ultrasonic Local Positioning System based on Encoded Beacons.}, booktitle = {2016 International Conference on Indoor Positioning Systems.}, year = {2016}, month = {10/2016}, pages = {1-10}, author = {Ure{\~n}a, J. and {\'A}lvaro Hern{\'a}ndez and J.J. Garcia and JC.Garcia and Jimenez, A. and E. Diaz and FJ. Alvarez and Jos{\'e} Manuel Villadangos and D.Gualda and Mar{\'\i}a del Carmen Perez} }