High-precision three-dimensional sound source localization scheme based on PDH demodulation technology

Abstract

The invention provides a high-precision three-dimensional sound source localization scheme based on a PDH demodulation technology. According to the scheme, thehigh-precision three-dimensional sound source localization scheme mainly comprises a narrow linewidth light source module, a high-precision three-dimensional sound source fiber FBG-FP probe module and a PDH demodulation feedback control module. According to the main scheme, a seed source in the narrow linewidth light source module provides three different sideband frequency optical signals through single sideband modulation, the three different sideband frequency optical signals are injected into a high-precision three-dimensional sound source optical fiber FBG-FP probe module, and the three different sideband frequency optical signals correspond to three axial sound sensitive FBG-FP; optical signals are reflected and then injected into a PDH demodulation feedback control module, feedback control is carried out on three sideband frequency radio frequency sources according to obtained PDH error signals in three axial directions, when sound source information exists, feedback control output in the three axial directions has difference in time sequence and intensity, and real-time high-precision monitoring of three axial sound sources is achieved after calculation. According to the scheme, the high-precision FBG-FP is taken as a sensing core, so that the single-axis sound source monitoring resolution and precision are improved, the accuracy of three-dimensional sound source positioning is greatly improved, and the high-precision three-dimensional sound source localization scheme has a relatively great application prospect.

Description

Technical field: [0001] The invention relates to the field of optical fiber sensing, in particular to a high-precision three-dimensional sound source localization scheme based on PDH demodulation technology. Background technique: [0002] Sound source localization (Direction-of-Arrival) technology has a wide range of application requirements, combined with other localization methods can achieve high-precision target identification. The DOA system is mainly composed of sound source acquisition system, sound source signal preprocessing system and sound source calculation system. At present, researchers have mainly done a lot of work on the processing and calculation of sound source signals (Yang Peng, Xu Qinqi, Sun Hao, Zu Linan, Zheng Yun, Yin Zhe, Wu Xiuqian. Three-dimensional sound source localization method [P]. Tianjin: CN103064061A, 2013-04-24; Zhu Jian, Zhang Xiangdong, Luo Zhiping, Yan Dong, Chen Zhuo. A microphone array Sound source localization method and device [P]...

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Problems solved by technology

The DOA system is mainly composed of sound source acquisition system, sound source signal preprocessing system and sound source calculation system. At present, researchers have mainly done a lot of work on the processing and calculation of sound source signals (Yang Peng, Xu Qinqi, Sun Hao, Zu Linan, Zheng Yun, Yin Zhe, Wu Xiuqian. Three-dimensional sound source localization method [P]. Tianjin: CN103064061A, 2013-04-24; Zhu Jian, Zhang Xiangdong, Luo Zhiping, Yan Dong, Chen Zhuo. A microphone array Sound source localization method and device [P]. Shandong: CN107422305A, 2017-12-01.), the sound source acquisition system uses a relatively mature electrical microphone array, but in fact the acquisition of the front-end sound source signal is the ultimate limit of the DOA system performance

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