MASSLOC: A Massive Sound Source Localization System based on Direction-of-Arrival Estimation

Georg K. J. Fischer; Thomas Schaechtle; Moritz Schabinger; Alexander Richter; Ivo Häring; Fabian Höflinger; Stefan J. Rupitsch

arXiv · 2508.12024

MASSLOC: A Massive Sound Source Localization System based on Direction-of-Arrival Estimation

Georg K. J. Fischer·Thomas Schaechtle·Moritz Schabinger·Alexander Richter·Ivo Häring·Fabian Höflinger·Stefan J. Rupitsch

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Abstract

Acoustic indoor localization offers the potential for highly accurate position estimation while generally exhibiting low hardware requirements compared to Radio Frequency (RF)-based solutions. Furthermore, angular-based localization significantly reduces installation effort by minimizing the number of required fixed anchor nodes. In this contribution, we propose the so-called MASSLOC system, which leverages sparse two-dimensional array geometries to localize and identify a large number of concurrently active sources. Additionally, the use of complementary Zadoff-Chu sequences is introduced to enable efficient, beamforming-based source identification. These sequences provide a trade-off between favorable correlation properties and accurate, unsynchronized direction-of-arrival estimation by exhibiting a spectrally balanced waveform. The system is evaluated in both a controlled anechoic chamber and a highly reverberant lobby environment with a reverberation time of 1.6 s. In a laboratory setting, successful direction-of-arrival estimation and identification of up to 14 simultaneously emitting sources are demonstrated. Adopting a Perspective-n-Point (PnP) calibration approach, the system achieves a median three-dimensional localization error of 55.7 mm and a median angular error of 0.84 deg with dynamic source movement of up to 1.9 mps in the challenging reverberant environment. The multi-source capability is also demonstrated and evaluated in that environment with a total of three tags. These results indicate the scalability and robustness of the MASSLOC system, even under challenging acoustic conditions.

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BibTeX RIS

Georg K. J. Fischer, Thomas Schaechtle, Moritz Schabinger, Alexander Richter, Ivo Häring, Fabian Höflinger, Stefan J. Rupitsch. 2025-08-16. MASSLOC: A Massive Sound Source Localization System based on Direction-of-Arrival Estimation. https://arxiv.org/abs/2508.12024

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