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Acoustic signal angle estimation method based on Beidou timing and microphone array

A microphone array, Beidou timing technology, applied in directions such as direction finders using ultrasonic/sonic/infrasonic waves, systems for determining direction or offset, etc., which can solve the algorithm deviation, the array element interval cannot be satisfied, and half-wavelength requires angle defuzzification and other problems, to achieve the effect of solving noise and reverberation, low equipment cost, and low environmental noise interference

Inactive Publication Date: 2019-07-02
ZHEJIANG UNIV
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Problems solved by technology

[0003] For the angle estimation method of high-frequency acoustic signals, the traditional MUSIC algorithm has an angle deambiguation problem because the array element spacing cannot meet the half-wavelength requirement. There is no effective solution to the situation

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  • Acoustic signal angle estimation method based on Beidou timing and microphone array
  • Acoustic signal angle estimation method based on Beidou timing and microphone array
  • Acoustic signal angle estimation method based on Beidou timing and microphone array

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] refer to figure 1 , the present invention provides a method based on Beidou timing and microphone array acoustic signal ranging and used for angle estimation, the method is composed of a loudspeaker and a microphone microphone array embedded in the Beidou timing module, comprising the following steps:

[0044] Step 1: Clock synchronization: The speaker and the microphone array use the built-in Beidou timing module to achieve microsecond-level clock synchronization;

[0045] Step 2: Ranging: The loudspeaker periodically emits a short-term high-frequency linear FM sound signal, and each array element of the microphone array collects the sound signal, and processes the sending and receiving signals through the GCC-PHAT algorithm and the reverberation filtering algorithm to obtain the sound source and The distance information between arra...

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Abstract

The invention discloses an acoustic signal angle estimation method based on Beidou timing and a microphone array. Therefore, noise and reverberation problems in the acoustic signal propagation processare solved effectively under the condition of not causing the noise pollution on the environment; and thus angle information of an acoustic source relative to the base station is obtained. Two hardware devices with Beidou timing modules embedded are arranged. The acoustic source is a loudspeaker being able to emit a customized short-time high-frequency chirp signal. The base station is a microphone array formed by a plurality of microphones. The acoustic source and the base station carry out microsecond-level Beidou clock synchronization; the acoustic source sends a chirp signal and the basestation receives the signal and acquires distance information between the acoustic source and the base station based on a GCC-PHAT algorithm and a reverberation filtering algorithm; and then on the basis of the geometric method, a distance measured by an array element is converted into an angle and a final angle of the acoustic source relative to the base station is obtained by using a weighted summation method.

Description

technical field [0001] The invention belongs to the field of Beidou and acoustic joint positioning, and in particular relates to an acoustic signal angle estimation method based on Beidou timing and a microphone array. Background technique [0002] At present, the demand for high-precision positioning is increasing day by day, and GNSS positioning is easily blocked by buildings, resulting in positioning failure. Therefore, it is necessary to use additional reference signals to assist positioning in indoor and complex outdoor environments. In the prior art, methods such as UWB, WIFI, and Bluetooth are relatively difficult in large-scale promotion due to factors such as their own compatibility, ranging range, and ranging accuracy. Acoustic-based positioning technology is widely used as a high-precision positioning method in radar, sonar and other fields. Its strong compatibility, low cost, and high precision have gradually become an important means in the positioning field. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 王智嵇程柴晴峰王晓轩陈敏麟
Owner ZHEJIANG UNIV
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