TY - CONF T1 - 3D Position Estimation of an UAV in Indoor Environments using an Ultrasonic Local T2 - International Conference on Indoor Positioning and Indoor Navigation (IPIN 2018) Y1 - 2018 A1 - Gualda, D A1 - UreƱa, J. A1 - M.C.Perez A1 - R. Nieto JF - International Conference on Indoor Positioning and Indoor Navigation (IPIN 2018) PB - IPIN CY - Nantes Francia ER -