DOA estimation algorithm for obtaining coherent signal subspace by utilizing orthogonality

A technology of signal subspace and coherent signal, applied in the field of DOA estimation of coherent signal source, to achieve the effect of good estimation performance

Inactive Publication Date: 2018-10-26
GUIZHOU INST OF TECH
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Problems solved by technology

[0003] In practical engineering, due to the influence of multipath, the signal received by the array receiver is often a mixture of incoherent and correlated signals, which makes the rank of the covariance matrix smaller than the number of signals, resulting in the classic MUSIC algorithm and ESPRIT algorithm cannot be directly DOA estimation for coherent signals

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  • DOA estimation algorithm for obtaining coherent signal subspace by utilizing orthogonality
  • DOA estimation algorithm for obtaining coherent signal subspace by utilizing orthogonality
  • DOA estimation algorithm for obtaining coherent signal subspace by utilizing orthogonality

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] A DOA estimation algorithm using orthogonality to obtain coherent signal subspaces, comprising the following steps:

[0027] Step 1, use the MUSIC algorithm to estimate the non-coherent signal.

[0028] Step 2, separate the coherent signal subspace from the signal subspace by orthogonality, and construct the covariance matrix of the coherent signal.

[0029] Step 3, recover the rank of the covariance matrix of the coherent signal with the spatial smoothing technique.

[0030] Step 4, process the covariance matrix of the coherent signal after rank restoration, and estimate the DOA of the non-coherent signal.

[0031] The specific process is as follows:

[0032] according to figure 1 Uniform linear array model, assuming that K far-field narrowband signals are incident on a uniform linear array composed of N array elements from different directions, and the n...

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Abstract

The invention discloses a DOA estimation algorithm for obtaining a coherent signal subspace by utilizing orthogonality. The algorithm separates the coherent signal subspace from a signal subspace by utilizing the orthogonality of a column vector of a transition matrix, constructs a correlation matrix by utilizing the coherent signal subspace, and restores an order of the correlation matrix by utilizing spatial smoothing technology on the correlation matrix, and finally processes the correlation matrix after restoration of the order, thereby estimating an arrival direction of the coherent signal. According to the algorithm, derivation and implementation steps of the algorithm are provided, a simulation experiment is designed, and simulation results show the validity of the algorithm.

Description

technical field [0001] The invention relates to the field of DOA estimation of coherent signal sources, in particular to a DOA estimation algorithm for obtaining coherent signal subspaces by using orthogonality. Background technique [0002] Signal DOA estimation is an important part of array signal processing, and it has applications in many fields such as radar, sonar, and wireless communication. Many high-performance DOA estimation algorithms have been proposed in the past 30 years. Among them, the subspace algorithm represented by the multiple signal classification algorithm MUSIC algorithm and the rotation invariant technology ESPRIT algorithm has attracted the attention and attention of many scholars since it was proposed. This type of algorithm has the advantages of high resolution and high estimation accuracy. [0003] In practical engineering, due to the influence of multipath, the signal received by the array receiver is often a mixture of incoherent and correlate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/12
CPCG01S3/12
Inventor 聂玺曾凯
Owner GUIZHOU INST OF TECH
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