Sound source locating method

A sound source localization and sound source technology, applied in the directions of localization, measurement devices, instruments, etc., can solve problems such as unsatisfactory results, and achieve the effect of overcoming the problem of non-uniform sound speed and ensuring sensitivity and reliability.

Inactive Publication Date: 2016-03-23
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

In theory, three sensor nodes can determine the position of the sound source. However, due to the existence of various measurement errors, the results obtained by using only three sensor nodes for positioning are generally not ideal. Usually, multiple sensors are deployed according to certain rules. Accurate localization of sound sources in the test area

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Taking two-dimensional space as an example below, the detailed implementation steps and calculation methods of the present invention are exemplified:

[0034] Such as figure 1 Shown:

[0035] The first step: place the sensor nodes in the test area to obtain the position coordinates of each sensor node; use the wind speed and direction sensors to obtain wind field parameters, including wind direction and wind speed; at the same time use the temperature sensor to obtain the temperature T of the test site; according to the temperature The temperature measured by the sensor calculates the speed of sound at the current temperature, and the empirical relationship between temperature (T) and the speed of sound is:

[0036] c 0 ≈331.6+0.6T(1)

[0037] The second step: according to the relative position of the sound source to be measured to e...

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Abstract

The invention relates to a sound source locating method comprising the following steps: (1) laying sensor nodes, and acquiring the parameters of a wind field; (2) correcting the sound velocity in different directions of propagation according to the position of a sound source to be detected relative to the sensor nodes; (3) using the corrected sound velocity to represent the propagation time of the sound source to be detected to the sensor nodes; and (4) calculating a first time delay difference for the sound source to be detected reaching two sensor nodes, measuring a second time delay difference for the sound source to be detected reaching the two corresponding sensor nodes, building an equation set based on the first time delay difference and the second time delay difference, and solving the equation set to obtain the location of the sound source. As the influence of the difference in sound velocity in different directions of propagation caused by the wind field is corrected radically, the defect of the traditional method in non-uniform velocity is overcome. Moreover, no other variables are introduced, and no requirement on the number of the sensor nodes is added.

Description

technical field [0001] The invention belongs to the field of acoustic signal processing, and relates to a distributed sensor positioning technology, in particular to a sound source positioning method. Background technique [0002] With the development of wireless sensor network and electronic technology, sound source localization technology has developed rapidly in the military and civilian fields because of its advantages of low cost, high security, and high concealment. The target positioning of aircraft, ground vehicles and artillery shells, surface ships and underwater submarines has gradually extended to civilian fields such as seismic detection and medical imaging, showing increasing application value. [0003] Distributed sound source localization technology uses multiple sensors to lay out according to certain rules, each sensor collects sound signals, and uses signal processing algorithms to determine the position of the sound source based on the collected signals. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 陈建峰闫青丽戚茜史文涛祁文涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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