Fine-grained acoustic positioning
The LOPSI group uses ultrasonic technology for high accuracy positioning in small indoor areas. By measuring the time-of-flight (TOF) of ultrasonic signals propagating from several static beacons to a mobile node, its position can be computed by multilateration techniques, usually with an accuracy around 1 cm.
3D-Locus is an ultrasound-based LPS designed and built by the LOPSI group and used to accurately locate archaelogical finds and transmit their position to a computer. A thorough description of the system is found here. We use this prototype system as a platform in which we develop new transducers, signal processing techniques, and positioning algorithms.
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These are some of the research topics on the LOPSI group in the field of ultrasound-based positioning systems:
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- Robust multilateration positioning in the presence of outliers in the time-of-flight measurements
- Autocalibration methods to determine the position of the network of beacons