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Multi-target far and near field mixed source positioning method under unknown colored noise

A technology of colored noise and near-field sources, applied in positioning and directional multi-channel systems, directional multi-channel systems using radio waves, etc. Problems such as poor stickiness

Active Publication Date: 2016-05-04
JILIN UNIV
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Problems solved by technology

[0006] The invention provides a multi-target far-near-field mixed source positioning method under unknown colored noise to solve the problems of poor robustness to complex noise in the existing far-near-field mixed source positioning technology, and additional deviations in the separation process of the far-field source and the near-field source.

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  • Multi-target far and near field mixed source positioning method under unknown colored noise
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  • Multi-target far and near field mixed source positioning method under unknown colored noise

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Embodiment Construction

[0082] Include the following steps:

[0083] Step 1: Use a symmetrical uniform linear sensor array to receive the target signal, and determine the form of the far-near field mixed source observation signal;

[0084] Suppose M (including M 1 near-field sources and M-M 1 far-field sources) uncorrelated signal sources are incident on a symmetrical uniform linear array composed of L=2N+1 sensors, where d is the array element spacing and is equal in length, and array element 0 is used as a reference array element, then the lth The received signal of (1≤l≤L) sensors at time t can be expressed as:

[0085]

[0086] where x l (t) is the sensor observation signal, s m (t) is the far-field source or near-field source envelope, n l (t) is the additive background noise of the sensor, M is the number of sources, is the angular frequency of the source signal, τ lm is the time delay difference from the reference array element to the lth sensor from the source m (1≤m≤M);

[0087] ...

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Abstract

The invention provides a multi-target far and near field mixed source positioning method under unknown colored noise, and belongs to the field of array signal processing. The method comprises the steps: receiving a target signal through employing a symmetric uniform linear sensor array; determining the types of observation signals of far and near field mixed sources; calculating a covariance matrix of array observation data; extracting far-field and near-field source components; obtaining a corresponding noise subspace, and achieving the estimation of a far-field source azimuth angle; obtaining a near-field source difference matrix; obtaining a corresponding signal subspace; searching an estimated near-field source azimuth angle through a one-dimensional angle; substituting the estimated near-field source azimuth angle into a two-dimensional MUSIC spectrum peak search, and achieving the estimation of a near-field source distance. The method is advantageous in that the method improves the applicability of the far and near field mixed source positioning technology to complex noises, avoids an introduced additional deviation in a separation process, improves the near-field source positioning performance, avoids two-dimensional spectrum peak search, and achieves the automatic matching of angle and distance.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a multi-target near-field source positioning method under unknown colored noise. Background technique [0002] Passive source location parameter estimation is the main research content in the field of array signal processing, which has important research significance and practical application value. According to the distance between the positioning target and the receiving sensor array, the traditional source location technology can be divided into far-field source location and near-field source location. However, in some practical applications, such as when using a microphone array to locate the speaker, the target signal may be located in the Fraunhofer (Fraunhofer) area of ​​the array aperture, or in the Fresnel (Fresnel) area of ​​the array aperture, That is, the array observation signal is composed of far-field sources and near-field sources. In essence, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/00G01S5/18G01S3/74G01S3/80
CPCG01S3/74G01S3/8006G01S5/00G01S5/18
Inventor 孙晓颖刘国红温艳鑫陈建燕学智
Owner JILIN UNIV
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