Method for coherent signal source DOA estimation under co-prime area array

A surface array and signal source technology, applied in the field of coherent signal source DOA estimation under coprime surface array, can solve the problem of signal covariance matrix rank deficit and so on

Active Publication Date: 2020-06-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] In order to solve the problem of the rank deficit of the received signal covariance matrix in the signal parameter estimation of the coherent source in the prior art, the present invention provides a method for DOA estimation of the coherent source under the coprime planar array, which realizes coprime Two-Dimensional DOA Estimation of Coherent Signal Sources in Plane Array

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  • Method for coherent signal source DOA estimation under co-prime area array
  • Method for coherent signal source DOA estimation under co-prime area array
  • Method for coherent signal source DOA estimation under co-prime area array

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Embodiment Construction

[0051] Below in conjunction with embodiment the present invention will be further described.

[0052] 1. Data model

[0053] The topological structure of the coprime array is as figure 1 shown. Compared with the traditional planar array, the coprime planar array can be divided into two subarrays, denoted as subarray 1 and subarray 2, and the elements of the subarrays only overlap at the origin. Among them, sub-array 1 is the number of array elements M 1 × M 1 The uniform area array, sub-array 2 consists of array elements M 2 × M 2 A uniform array of . The element spacing of sub-array 1 in the direction of X-axis and Y-axis is d 1 = M 2 λ / 2, where: λ is the wavelength of the incident signal, and the element spacing of sub-array 2 in the X-axis and Y-axis directions is d 2 = M 1 λ / 2. Therefore, the total number of array elements of the coprime plane array is Array element position L s It can be represented by the following set:

[0054] L s ={(zd 1 ,nd 1 )|0≤z,...

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Abstract

The invention discloses a method for estimating a two-dimensional direction of arrival (DOA) of a coherent signal source under a co-prime area array. The method comprises the following steps: firstly,introducing a spatial smoothing technology to pre-process a covariance matrix of received data, so that the covariance matrix recovers a column full rank; on the basis, the method estimates the direction of arrival of a coherent signal source based on the rotation invariance of the array, and eliminates a fuzzy value by means of the co-prime relationship of two sub-area arrays in the array. Effective positioning of the spatial coherent signal source can be realized, and DOA estimation performance is excellent. In addition, automatic pairing of signal two-dimensional parameters can be realizedwithout an additional angle pairing method, and two-dimensional spectral peak search is not required in parameter estimation, so that the algorithm is low in complexity.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and relates to a positioning method of a coherent signal source, in particular to a method for DOA estimation of a coherent signal source under a coprime plane array. Background technique [0002] As an important branch of array signal processing, signal space spectrum estimation is widely used in many military and national economic fields such as radar, communication, sonar, survey, radio astronomy and biomedical engineering. Classic super-resolution DOA estimation algorithms include subspace decomposition algorithms, subspace fitting algorithms, etc., and these algorithms have good spatial spectrum estimation performance under ideal conditions. In the actual environment, due to the influence of factors such as multipath propagation, there are a large number of coherent signal sources. Because the signal subspace and noise subspace of the coherent signal source interpenetrate, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/74
CPCG01S3/74
Inventor 周梦婕张小飞林新平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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