A5.2 - Ultrasound Transmission System for TDOA Localization with Unsynchronized Beacons
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- A5 - Acoustic Sensing
- A. Ens, L. Reindl, J. Bordoy, J. Wendeberg, C. Schindelhauer - University of Freiburg (Germany)
- 113 - 118
Indoor localization based on time difference of arrival (TDOA) has been recently a promising field of study. We consider the previously unsolved problem of locating a moving target receiver by using unsynchronized stationary beacons without requirement of manual calibration. Thus, the received signals and their time of arrival (TOA) have to be assigned to a beacon. We present an ultrasound transmission system approach which is robust against multipath and estimating the reception time with high accuracy. In order to avoid interference by echoes the packet size is reduced by using two frequencies in Orthogonal Frequency Division Multiplex (OFDM). Further, the transmission system enables distinction of the beacons, as the ultrasound signals are used both for localization and for information transmission.