A high-resolution positioning method of rotating sound source based on phase average

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 125-136.

CHU Ning1,2, HUANG Qian1, YU Liang3, NING Yue1, XU Jianfeng2, WU Dazhuan1

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Abstract

Here, a high-resolution localization method of rotating sound source based on phase average was proposed, and the applicable conditions of phase average technology were given. To solve rotating blur caused by Doppler effect, a rotating sound signal was divided into enough time series slices. In each slice, a rotating sound source with small displacement was approximately equivalent to a static sound source for positioning. The advantage was the interpolation calculation of de-Doppler effect being avoided and the phase continuity of time domain waveform being preserved. Furthermore, to improve the positioning resolution, the energy transmission model based on beamforming was modified with the convolution model, and the deconvolution algorithm was used to eliminate positioning ambiguity and improve positioning accuracy. The advantage was the point spread function (PSF) in convolution model being able to establish the connection between array measurement and sound source rotating. Thus, PSF was used to characterize the positioning performance of microphone array and analyze effects of frequency on positioning resolution. Finally, the effectiveness and robustness of the proposed method were verified using simulation, rotating monopole experiments and fan tests.

Key words

phase average / rotating sound source localization / Doppler effect / deconvolution / point spread function (PSF)

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CHU Ning, HUANG Qian, YU Liang, NING Yue, XU Jianfeng, WU Dazhuan. A high-resolution positioning method of rotating sound source based on phase average[J]. Journal of Vibration and Shock, 2021, 40(19): 125-136

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