Fast communication: Calibration errors of uniform linear sensor arrays for DOA estimation: an analysis with SRP-PHAT

Authors:
M. Swartling;N. Grbić
Affiliations:
Department of Electrical Engineering, Blekinge Institute of Technology, SE-371 79 Karlskrona, Sweden;Department of Electrical Engineering, Blekinge Institute of Technology, SE-371 79 Karlskrona, Sweden
Venue:
Signal Processing
Year:
2011

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Abstract

This article presents an analysis of the sensitivity of geometrical sensor errors in acoustic source localization using the well-established SRP-PHAT method. The array in this analysis is a uniform linear array and the intended source is human speech in the far field. Two major results are presented: inner-sensor geometrical errors in the linear array produce smaller localization errors than corresponding geometrical errors do in the two end-point sensors, and the localization error rises sharply for a total geometrical error exceeding the equivalence of the acoustic propagation distance of 23 of the sample time instance (approximately 3cm at 8kHz). The article also provides a mathematical and graphical explanation of the results.