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Passive indoor-localization using echoes of ultrasound signals

: Höflinger, Fabian; Saphala, Addythia; Schott, Dominik Jan; Reindl, Leonhard Michael; Schindelhauer, Christian


Institute of Electrical and Electronics Engineers -IEEE-:
International Conference on Advanced Information Technologies, ICAIT 2019 : 6-7 November 2019, Yangon, Myanmar
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-5173-1
ISBN: 978-1-7281-5174-8
International Conference on Advanced Information Technologies (ICAIT) <2019, Yangon/Myanmar>
Fraunhofer EMI ()
indoor localization; embedded system; signal processing; acoustic signals; passive localization; time-of-flight

In this paper, we present our novel indoor-localization system. The system uses only short inaudible acoustic signals to locate acoustically passive objects in a room. Moving objects can be detected as well as resting objects. The localization device consists of a transmitter (speaker) and a multi-channel receiver with up to eight receivers (microphones). The total time-of-flight path from the speaker to the microphones is the round-trip-time of the signal from the speaker to the reflecting object and back to the microphones. Therefore, a localization algorithm is used to translate the timing into object coordinates. By using a simple approach of direct intersection, the 3D-coordinates of the reflecting surface of the target can be derived. In an experiment, we demonstrate the functionality of this approach.