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A Method for Doa Estimation of Coherent Sources in Coprime Plane Array

A technology of area array and information source, which is applied in the field of DOA estimation of coherent information sources under coprime area array, can solve problems such as signal covariance matrix rank deficit, and achieve the effect of low algorithm complexity

Active Publication Date: 2022-04-08
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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  • A Method for Doa Estimation of Coherent Sources in Coprime Plane Array

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[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 two-dimensional direction of arrival (Direction of arrival, DOA) estimation method of a coherent signal source under a coprime surface array. This method firstly introduces the spatial smoothing technique to preprocess the covariance matrix of the received data to restore the full rank. On this basis, the method estimates the direction of arrival of the coherent signal source based on the rotation invariance of the array, and eliminates the ambiguity value with the help of the mutual prime relationship between the two sub-arrays in the array. The invention can realize effective location of space coherent information sources, and has excellent DOA estimation performance. In addition, the present invention can realize automatic pairing of signal two-dimensional parameters without an additional angle matching method, and does not need to search for two-dimensional spectrum peaks in parameter estimation, so the complexity of the algorithm is low.

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 Patents(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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