Acoustic source orientation estimation method for compressed gas leakage in wireless acoustic sensor network

Abstract

The invention discloses a sound source orientation estimation method for compressed gas leakage in a wireless sound sensor network, and mainly solves the following problems that (1), the detection is not complete and safe because a worker needs to carry out regular inspection tour nearby a to-be-detected part; (2), the sampling rate is high, the data size is large and the needed storage capacity is large. The method comprises the following implementation steps: (1), arranging a microphone array; (2), selecting a reference microphone and a compressed sampling microphone; (3), carrying out the standard sampling; (4), carrying out the compressed sampling; (5), constructing a sparse base matrix; (6), constructing a measurement matrix; (7), carrying out the estimation of sound source orientation of compressed gas leakage. The method can directly obtain the accurate sound source orientation of compressed gas leakage in a node of a wireless sound sensor network through a small amount of low-speed sampling data, is small in needed storage capacity, is high in real-time performance, and is easy for hardware implementation.

Description

technical field [0001] The invention belongs to the field of gas leakage detection, and further relates to a method for estimating the direction of a sound source of compressed gas leakage under the background of a wireless acoustic sensor network (Wireless Acoustic Sensor Network). The invention uses the compression sampling method to reduce the sampling rate and sampling number of the microphones in the nodes of the wireless acoustic sensor network, and can accurately estimate the direction of the sound source of compressed gas leakage in each node of the wireless acoustic sensor network. Background technique [0002] The ultrasonic waves produced by compressed gas leakage are higher than the perception of human ears. According to the good directionality of ultrasonic wave propagation, the sound source direction of compressed gas leakage can be obtained. Using the ultrasonic characteristics of compressed gas leakage to estimate the direction of the sound source of compress...

AI Technical Summary

Problems solved by technology

Although this method improves the accuracy of the estimation of the direction of the sound source of compressed gas leakage, the disadvantages of this method are: it requires staff to conduct regular inspections at close range at the location to be detected, and it is difficult to detect areas that are difficult for personnel to reach. The detection is not comprehensive; in addition, in the event of flammable, explosive or toxic gas leakage, the life safety of the staff will be threatened

Although this method uses the sparse representation method to accurately obtain the sound source direction of the compressed gas leakage, there are still shortcomings in this method: each microphone needs to sample a large amount of data at a high sampling rate, resulting in a large amount of storage required for this method. Large, slow operation speed, and difficult to implement on hardware

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