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Microphone localization with self calibrating acoustic GPS

Ernst, Daniel and Ahlefeldt, Thomas and Haxter, Stefan and Spehr, Carsten (2017) Microphone localization with self calibrating acoustic GPS. 23rd AIAA/CEAS Aeroacoustics Conference, 05.-06. Juni 2017, Denver, USA.

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Official URL: https://www.aiaa.org/EventDetail.aspx?id=33590

Abstract

The exact positions of microphones are mandatory when using them as an array to apply beamforming algorithms. Nevertheless to obtain these positions in the three dimensional space is challenging. In this paper, further developments of the acoustic calibration unit, proposed in 2009 by Lauterbach are presented. The acoustic calibration unit consists of several speakers and a reference microphone to obtain the positions of an arbitrary amount of target microphones via triangulation. These calculated positions is not necessarily the geometric position of the microphone, it is the acoustic position, which includes possible phase shifts, directivity and mounting effects. In the new acoustic calibration unit a second reference microphone is installed to measure the actual speed of sound. A new triangulation algorithm was developed to reduce the uncertainty of the known reference positions. Furthermore the new acoustic calibration unit was tested on an traversed array with 16 microphones in an anechoic chamber and the open jet array of the ONW-LLF Windtunnel with an diameter of about 4 m. In the final paper a third measurement will be included with an array where the geometric microphone positions are known within a tolerance of 1/100 mm.

Item URL in elib:https://elib.dlr.de/118005/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://doi.org/10.2514/6.2017-3842
Title:Microphone localization with self calibrating acoustic GPS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ernst, DanielDaniel.Ernst (at) dlr.deUNSPECIFIED
Ahlefeldt, Thomasthomas.ahlefeldt (at) dlr.deUNSPECIFIED
Haxter, StefanStefan.Haxter (at) dlr.deUNSPECIFIED
Spehr, Carstencarsten.spehr (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Microphone Localization, Acoustic GPS
Event Title:23rd AIAA/CEAS Aeroacoustics Conference
Event Location:Denver, USA
Event Type:international Conference
Event Dates:05.-06. Juni 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Bachmann, Barbara
Deposited On:11 Jan 2018 08:46
Last Modified:04 Dec 2018 14:44

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