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Doppler effect in the time-domain beamforming for rotating sound source identification
1School of Aeronautics and Astronautics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
The Journal of the Acoustical Society of America
|August 6, 2020
Summary
This study addresses the Doppler effect in rotating sound source identification using ROSI beamforming. It details how to eliminate ghost contributions caused by the Doppler effect, improving source localization accuracy.
Area of Science:
- Acoustics
- Signal Processing
- Mechanical Engineering
Background:
- Rotating sound source identification is crucial for industrial applications.
- ROSI (Rotating Source Identification) beamforming is a key technique for this purpose.
- The Doppler effect presents challenges in accurately identifying moving sound sources.
Purpose of the Study:
- To identify and eliminate the Doppler effect within ROSI beamforming.
- To address ghost contributions in ROSI caused by rotating sound sources.
- To enhance the accuracy of rotating sound source localization.
Main Methods:
- Analysis of Doppler effect-induced ghost contributions in ROSI.
- Investigation of modulation frequencies equal to rotation frequency.
- Utilizing rotational symmetry arrays to mitigate ghost contributions.
Main Results:
- Non-zero sources induce ghost contributions at sideband frequencies in ROSI.
- These ghost contributions are modulated by the source's rotation frequency.
- Rotational symmetry arrays can eliminate specific sideband ghost contributions.
Conclusions:
- Effective identification and elimination of the Doppler effect are essential for accurate ROSI beamforming.
- Understanding and mitigating ghost contributions improves rotating sound source localization.
- The proposed methods enhance the reliability of ROSI for arbitrary microphone configurations.
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