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Direction-of-arrival estimation method based on nested subarray array

A direction-of-arrival estimation and formula technology, applied in the field of signal processing, can solve the problems of limited transmission power, degree of freedom and array aperture reduction, etc., and achieve the effects of easy change of positions, strong angle resolution, and convenient mass production

Active Publication Date: 2016-08-03
XIDIAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, since the estimation algorithm based on spatial smoothing is generally only suitable for uniform linear arrays, DOA estimation can only use a part of the virtual array constructed by the coprime array, which will reduce the degree of freedom and the array aperture.
[0005] However, even if the array structure has a high degree of freedom and array aperture, the issue of array density must also be considered. A lower array density will cause limited transmission power, which is undesirable in actual engineering
[0006] In summary, although the existing arrays can obtain more degrees of freedom than the number of array elements, they all have certain limitations, so it is necessary to design a new array with better comprehensive performance

Method used

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  • Direction-of-arrival estimation method based on nested subarray array
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Embodiment 1

[0046] In the first embodiment, the sub-array structure and the inner element structure of the sub-array both adopt the uniform linear array ULA structure to estimate the direction of arrival of the nested sub-array array.

[0047] Step 1. Given the total number of elements S, construct the sub-array structure and the element structure in the sub-array.

[0048] The non-uniform array structure in the prior art includes three: one is the minimum redundant array MRA, the structure of which is to obtain the minimum redundant sequence and the minimum redundant array MRA according to the total number of array elements S; the second is the embedded The structure of the nested array NA is to obtain the nesting level of the array according to the total number of array elements S, and then determine the number of array elements on each level according to the nesting level, so as to obtain the array structure of the nested array NA; The three are the coprime array CA, the structure of which ...

Embodiment 2

[0112] In Embodiment 2, the sub-array structure adopts a uniform linear array ULA structure, and the inner element structure of the sub-array adopts a nested sub-array array with a minimum redundant array MRA structure to estimate the direction of arrival of the nested sub-array.

[0113] The difference between the second embodiment and the first embodiment is that the structure of the sub-array and the structure of the element in the sub-array are different in step 1, and the other steps are the same as in the first embodiment. The steps for constructing the sub-array structure and the structure of the element in the sub-array are as follows:

[0114] (1a) Given the total number of elements S, factorize S to obtain the number of elements M and the number of subarrays N:

[0115] S=M·N,

[0116] Among them, the values ​​of M and N are the closest, and M≥2, N≥2;

[0117] (1b) According to the number M of the element in the sub-array, the structure of the element in the sub-array is desig...

Embodiment 3

[0129] In Embodiment 3, the sub-array structure adopts the uniform linear array ULA structure, and the inner element structure of the sub-array adopts the nested linear array NA structure to estimate the direction of arrival of the nested sub-array array.

[0130] The difference between the third embodiment and the first embodiment is that the structure of the sub-array and the structure of the element in the sub-array are different in step 1, and the other steps are the same as in the first embodiment. The steps for constructing the sub-array structure and the structure of the element in the sub-array are as follows:

[0131] 1-a) Given the total number of array elements S, factorize S to obtain the number of elements M and the number of sub-arrays N:

[0132] S=M·N,

[0133] Among them, the values ​​of M and N are the closest, and M≥2, N≥2;

[0134] 1-b) According to the number M of the elements in the sub-array, the structure of the elements in the sub-array is designed to be the sam...

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Abstract

The invention discloses a direction-of-arrival estimation method based on a nested subarray array, and mainly solves the problem existing in the prior art that the degree of freedom, array aperture and array density are not high. The realization process includes the steps of: 1. giving the total number of array elements, and determining the number of subarrays and the number of array elements in each subarray; 2. selecting a uniform linear array or minimum redundancy array or nested linear array structure according to the number of array elements in each subarray; 3. selecting a uniform linear array or minimum redundancy array or nested linear array structure according to the number of the subarrays; 4. constructing a nested subarray array according to a selected array element structure in each subarray and subarray structure; 5. obtaining received data X(t) according to the nested subarray array; 6. obtaining differential synthesis array received data zc according to X(t), and then obtaining a rank recovery data covariance matrix RSS; and 7. decomposing characteristic values of the RSS to obtain a direction-of-arrival estimation angle. The direction-of-arrival estimation method provided by the invention has the advantages of flexible array configuration and good direction-of-arrival estimation angle measurement performance under the same conditions, and can be used for radar target signal detection or power estimation.

Description

[0001] The invention belongs to the technical field of signal processing, and particularly relates to a non-equidistant linear array configuration method, which is used to estimate the direction of arrival when the number of targets is greater than the number of array elements, and to improve the degree of freedom, angle measurement accuracy and density of the array. Background technique [0002] DOA estimation of the direction of arrival is an important research direction in radar and sonar signal processing. For a uniform linear array with S array elements, the traditional direction of arrival estimation method is adopted, such as MUSIC, ESPRIT, etc. The maximum number of targets that can be resolved is S-1. The under-determined direction of arrival estimation problem, that is, DOA estimation with the number of targets greater than the number of array elements often appears and arouses widespread research interest. An effective method to solve this problem is to use an equivale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 杨明磊陈伯孝孙磊曾小路
Owner XIDIAN UNIV
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