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Near-field signal source positioning method based on improved MUSIC algorithm

A positioning method and signal source technology, applied in the field of signal processing, can solve problems such as low precision, non-uniform noise, and complex construction process of Toeplitz matrix, so as to improve the accuracy of direction of arrival estimation and distance estimation, and ensure positioning efficiency Effect

Active Publication Date: 2021-11-30
XIDIAN UNIV
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Problems solved by technology

This method effectively solves the problem of non-uniform noise when locating near-field signal sources, but the disadvantage is that there is no constraint on the steering vector, and the spatial spectral function is directly constructed by using the steering vector and the noise subspace matrix, resulting in the direction of arrival of the near-field signal source The precision of estimation and distance estimation is low, and the construction process of Toeplitz matrix is ​​complicated, and the computational complexity is high

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  • Near-field signal source positioning method based on improved MUSIC algorithm
  • Near-field signal source positioning method based on improved MUSIC algorithm
  • Near-field signal source positioning method based on improved MUSIC algorithm

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[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] refer to figure 1 , the present invention comprises the following steps:

[0040] Step 1) Construct a uniform linear array P:

[0041] Construct a uniform line array P={p including M omnidirectional sensor array elements 0 ,...,p m ,...,p M-1}, and p 0As a reference array element, the distance between adjacent omnidirectional sensor array elements in the uniform linear array P is d, where M≥2, p m Indicates the m+1th omnidirectional sensor array element, d≤λ / 4, and λ is the narrowband signal wavelength incident to the array;

[0042] The structure of the received signal model of the uniform linear array in this embodiment is as follows: figure 2 As shown, the uniform line array P={p including M=7 omnidirectional sensor array elements 0 ,p 1 ,...,p 6}, the uniform linear array P is located on the one-dimensional coord...

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Abstract

The invention provides a near-field signal source positioning method based on an improved MUSIC algorithm. The near-field signal source positioning method comprises the following implementation steps of constructing a uniform linear array P, obtaining an array output signal vector X(t) of the uniform linear array P, obtaining an estimated value of a covariance matrix of the received data array to obtain a noise subspace matrix Un, constructing a cost function V(b, c), and obtaining a cost function solution set based on an improved MUSIC algorithm, and obtaining a positioning estimation result of the near-field signal source through drawing an amplitude spectrogram. According to the improved MUSIC algorithm, the solution set of the cost function is obtained through derivation of the cost function, then the amplitude spectrogram is drawn according to the solution set of the cost function, the positioning estimation result of the near-field signal source is obtained, and the estimation precision of the direction of arrival and the distance in near-field signal source positioning is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a near-field signal source positioning method, in particular to a near-field signal source positioning method based on an improved MUSIC algorithm, which can be used to acquire signal azimuth parameters. Background technique [0002] Array signal processing is an important branch of modern signal processing. Its research content includes signal detection, parameter estimation, spatial filtering, target imaging, etc., and is widely used in radar, sonar, communication, navigation, seismic exploration, radio astronomy, electronic medical treatment And many other military and civilian fields. According to the distance between the signal source and the receiving array, it can be divided into far-field signal source and near-field signal source. Compared with the far-field signal source, the processing of the signal emitted by the near-field signal source is more complicated. A...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/00G06F17/11G06F17/15G06F17/16
CPCG01S3/00G06F17/11G06F17/15G06F17/16Y02D30/70
Inventor 蔡晶晶李盼盼鲍丹谭富伟
Owner XIDIAN UNIV
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