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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 the degree of freedom and the reduction of the array aperture, the limited transmission power, etc., and achieve the effects of easy change of positions, low cost, and convenient mass production

Active Publication Date: 2018-05-04
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • 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
  • Direction of Arrival Estimation Method Based on Nested Subarray Array
  • Direction of Arrival Estimation Method Based on Nested Subarray Array

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Experimental program
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Effect test

Embodiment 1

[0046] In Embodiment 1, both the sub-array structure and the array element structure within the sub-array adopt the nested sub-array array DOA estimation of the uniform linear array ULA structure.

[0047] Step 1. Given the total number of array elements S, construct the subarray structure and the array element structure within the subarray.

[0048] The non-uniform array structure in the prior art includes three: one is the minimum redundant array MRA, and its structure is to obtain the array structure of the minimum redundant sequence and the minimum redundant array MRA according to the total array element number S; the second is the embedding The nested array NA is constructed by obtaining the nesting series of the array according to the total number of array elements S, and then determining the number of array elements on each level according to the nesting series, thereby obtaining the array structure of the nested array NA; The third is the coprime array CA, whose struct...

Embodiment 2

[0112] In Embodiment 2, the sub-array structure adopts a uniform linear array ULA structure, and the sub-array element structure adopts a minimum redundant array MRA structure for nested sub-array DOA estimation.

[0113] The difference between this embodiment 2 and embodiment 1 is that the structure of the sub-array and the structure of the array elements in the sub-array are different in step 1, and the other steps are the same as in embodiment 1. The steps of constructing the structure of the sub-array and the structure of the array elements in the sub-array are as follows:

[0114] (1a) Given the total number of array elements S, factorize S to obtain the number of array elements in the sub-array M and the number of sub-arrays 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 array elements in the sub-array, the structure of the array elements in the sub-array is designed to be the sam...

Embodiment 3

[0129] In Embodiment 3, the sub-array structure adopts the ULA structure of the uniform linear array, and the array element structure in 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 this embodiment 3 and embodiment 1 is that the structure of the sub-array and the structure of the array elements in the sub-array are different in step 1, and the other steps are the same as in embodiment 1. The steps of constructing the sub-array structure and the structure of the array elements 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 array elements M in the sub-array 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 array elements in the sub-array, the structure of the array elements...

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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 in particular relates to a non-equidistant linear array configuration method, which is used for estimating the direction of arrival when the number of targets is greater than the number of array elements, and improving the degree of freedom, angle measurement accuracy and density of the array. Background technique [0002] Direction of Arrival (DOA) estimation is an important research direction in radar and sonar signal processing. For a uniform linear array with S array elements, the maximum number of targets that can be resolved by traditional DOA estimation methods such as MUSIC and ESPRIT is S-1. The problem of underdetermined DOA estimation, that is, DOA estimation where the number of targets is greater than the number of array elements, often appears and arouses extensive research interest. An effective way to solve this problem is to improve the DOF of direction of arrival estimation by using ...

Claims

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Application Information

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Patent Type & Authority Patents(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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