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An Acoustic Signal Delay Estimation Method Based on Phase Difference and Maximum Likelihood Estimation

A technique of maximum likelihood estimation and delay estimation, which is applied in the field of acoustic signal delay estimation based on phase difference and maximum likelihood estimation.

Active Publication Date: 2019-04-30
XIDIAN UNIV
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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the current target passive positioning method has high computational complexity, and it is impossible to estimate the position of the target in real time and realize the target tracking for the moving target.

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  • An Acoustic Signal Delay Estimation Method Based on Phase Difference and Maximum Likelihood Estimation
  • An Acoustic Signal Delay Estimation Method Based on Phase Difference and Maximum Likelihood Estimation
  • An Acoustic Signal Delay Estimation Method Based on Phase Difference and Maximum Likelihood Estimation

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[0043] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] Such as figure 1 As shown, the acoustic signal delay estimation method based on phase difference and maximum likelihood estimation provided by the embodiment of the present invention includes the following steps:

[0046] S101: Under the noise background, use the acoustic sensor array to collect signals and perform preprocessing through cross-correlation function and short-time Fourier transform to obtain frequency domain signals;

[0047] S102: Calculate the relative phase rat...

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Abstract

The invention belongs to the technical field of wireless monitoring, and discloses a sound signal time delay estimation method based on a phase difference and maximum likelihood estimation. The methodcomprises the steps that in a noise background, signals are acquired by a sound sensor array and preprocessed through a cross-correlation function and short-time Fourier transform to obtain frequencydomain signals; the relative phase ratios of two sound signals are calculated, and the probabilities of all possible time delay estimation values are obtained by combining the principle of a maximumlikelihood estimation algorithm; and on the condition of not relying on signal and noise prior knowledge, the time delay value corresponding to a maximum probability peak value is taken as the final time delay estimation value. According to the sound signal time delay estimation method, the time difference of arrival (TDOA) of a sound source can be precisely estimated; 10 groups of data with the length of 1,024 sampling points are acquired, the mean square errors of the delay time are calculated when 0.0029 s, 0.0059 s, 0.0088 s and 0.0118 s are delayed respectively, and it can be seen that the method has the high accuracy through the diagram 1 and the diagram 2.

Description

technical field [0001] The invention belongs to the technical field of wireless monitoring, in particular to an acoustic signal delay estimation method based on phase difference and maximum likelihood estimation. Background technique [0002] Target passive positioning technology has been a hot issue in the field of wireless monitoring and has been widely used in military monitoring, environmental monitoring, emergency rescue and disaster relief. The passive target itself does not emit electromagnetic waves and has high concealment. Therefore, it is very necessary to study the accurate passive target positioning scheme. At present, the positioning technology based on geometric parameter optimization has been studied at home and abroad, which can be mainly divided into four categories based on time of arrival TOA, time difference of arrival TDOA, angle of arrival AOA, and received signal strength RSS. Time of Arrival TOA positioning technology estimates the target position b...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06G01S11/14
CPCG01S11/14H04J3/0635
Inventor 刘立芳杨海霞齐小刚王静刘兴成
Owner XIDIAN UNIV
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