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Direction-of-arrival estimation method based on differential array

A technology of direction of arrival estimation and differential array, which is applied to the direction of the direction determination, the system to determine the direction or offset, the direction finder using ultrasonic/sonic/infrasonic waves, etc., which can solve the problem of wideband DOA estimation accuracy error , to achieve the effect of reducing positioning accuracy, reducing computational complexity and improving accuracy

Active Publication Date: 2020-06-05
西北工业大学太仓长三角研究院 +1
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Problems solved by technology

[0006] In engineering practice, for limited sampling data, the beamforming matrix does not satisfy the unitary matrix condition, that is, the spatial noise of the beams is spatially correlated. At this time, the traditional wideband beamforming spatial MUSIC algorithm has a low precision for wideband DOA estimation. large error

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  • Direction-of-arrival estimation method based on differential array
  • Direction-of-arrival estimation method based on differential array
  • Direction-of-arrival estimation method based on differential array

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Embodiment Construction

[0067] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0068] Device embodiment: When using this technology to identify and locate broadband signal sources in a complex background environment, first use the HMM algorithm to identify and judge the signals collected by the microphone array. If the recognition rate exceeds the threshold, it means that the signal collected this time contains the source signal of interest, then transfer to the subsequent signal source positioning module, and use the improved broadband beam spatial positioning algorithm to accurately locate the direction of the source wave; if If the recognition rate does not exceed the threshold, it means that the signal collected this time does not contain the source signal of interest. Then use the microphone array to collect new signals from the space again, and continue the processing flow of step 1.

[0069] Such as figure 1 Shown, the present inven...

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Abstract

The invention provides a direction-of-arrival estimation method based on a differential array. An HMM-based sound source identification module and a signal source positioning module are introduced into a traditional sound source identification and positioning system; therefore, an information source signal and an interference and noise signal are separated in a complex environment; compared with atraditional positioning algorithm, the method effectively reduces the operation complexity on the basis of guaranteeing the positioning precision, and improves the discrimination among different signal sources through employing a weighted signal subspace (WSS) algorithm under the condition that the incoming wave directions of a plurality of signal sources are very close.

Description

technical field [0001] The invention belongs to the research on the multiple signal classification (MUSIC) algorithm in the subspace method, and realizes the super-resolution estimation of the arrival direction of the incident signal by using the improved beam space method and the weighted signal subspace algorithm. Compared with the classical MUSIC algorithm, the computational complexity is reduced, and the performance of the wideband beam space MUSIC algorithm is improved by introducing a Weighted Signal Subspace (WSS) estimator. Background technique [0002] As a branch of array signal processing field, microphone array has been widely used in video conferencing, speech enhancement and recognition, etc. Sound source localization is an important basis for spatial filtering of microphone arrays, and has developed rapidly in recent years. Array-based positioning algorithms can be divided into super-resolution algorithms and non-super-resolution algorithms. The super-resolu...

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Application Information

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IPC IPC(8): G01S3/802
CPCG01S3/8027
Inventor 智永锋
Owner 西北工业大学太仓长三角研究院
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