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Hongbin He

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Proceedings Article | 10 October 2023 Paper

Harmonic frequency and direction joint estimation for airborne acoustic target localization

Hongbin He, Yong Chen, Xingfang Luo

Proceedings Volume 12799, 127994C (2023) https://doi.org/10.1117/12.3005840

KEYWORDS: Superposition, Fourier transforms, Target detection

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For the line spectrum detection of airborne sound, sometimes there may be errors in the fundamental frequency of the signal. Moreover, the line spectrum detection only considers the frequency band of the signal fundamental frequency, so the utilization rate of harmonic frequency energy is low. To solve these problems, this paper proposes a joint estimation method of harmonic frequency and direction in airborne acoustic target location based on microphone array. First, using the characteristics of line spectrum signal, minimum variance distortionless response (MVDR) beam scanning is carried out in the frequency band where the signal fundamental frequency is located to avoid fundamental frequency error. Then, according to the frequency multiplication relationship between fundamental frequency and harmonic, the superposition of harmonic frequency energy is used to ensure the peak value of target signal in frequency domain and azimuth. Through Matlab simulation and experimental data analysis, the effectiveness of this method is proved.

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