DOA estimation method based on enhanced nested array

An enhanced, DOA technology, which is applied to direction finders for measuring directions, direction finders using electromagnetic waves, and direction finders using radio waves. Differential co-array is not continuous and other issues

Inactive Publication Date: 2020-04-03
JINLING INST OF TECH
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Problems solved by technology

Compared with the uniform linear array, the sparse non-uniform linear array has more degrees of freedom and can estimate more sources; the array configuration of MRA and MHA has no closed expression; the differential common array of CPA and its derivative array It is not continuous, and the effective array aperture is low; the differential co-array of nested array has non-porous characteristics, but its continuous degree of freedom and effective array aperture need to be further improved

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  • DOA estimation method based on enhanced nested array
  • DOA estimation method based on enhanced nested array
  • DOA estimation method based on enhanced nested array

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Embodiment Construction

[0050] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0051] refer to figure 1 , a kind of DOA estimation method based on enhanced nested array of the present invention, comprises:

[0052] Step 1: Construct an enhanced nested array using two uniform line arrays with different element spacing and an independent sensor;

[0053] The enhanced nested array consists of three parts: a uniform linear array a, a uniform linear array b and an independent sensor o:

[0054] Define a uniform linear array a containing N 1 array elements, the array element spacing is d; the uniform linear array b contains N 2 -1 array element, the array element spacing is N 1 d;

[0055] Take the first array element of the uniform linear array a as the initial array element, and the independent sensor o is located at (2N 1 At +1)d, the distance between the first element of the uniform linear array b and the sensor o is ...

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Abstract

The invention discloses a DOA estimation method based on an enhanced nested array. The DOA estimation method comprises the following steps: constructing the enhanced nested array by utilizing two uniform linear arrays with different array element distances and an independent sensor; spatial sampling is carried out on the target radiation source, and vectorization processing is carried out on a covariance matrix of an antenna array receiving signal; calculating a differential common matrix of the enhanced nested array; meshing the observation airspace, and constructing an over-complete basis matrix; and converting a DOA estimation problem of the target radiation source into a problem of solving an l1 norm minimization constraint equation based on a compressed sensing method, and realizing DOA estimation of the target radiation source through spectral peak search. Based on an enhanced nested array and a compressed sensing theory, a DOA estimation problem is converted into a norm minimization constraint equation solving problem, high-precision DOA estimation can be realized under non-ideal conditions such as a low signal-to-noise ratio and a small snapshot number, and the number of estimated signal sources is greater than the number of array elements.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and in particular relates to an enhanced nested array-based DOA estimation method. Background technique [0002] DOA estimation is an important research branch in the field of array signal processing, and has important application value in the fields of radar, sonar, and wireless communication, where antenna arrays are used to receive spatial sampling of incident signals. The most widely used uniform linear array in the field of array signal processing is limited by the degree of freedom and array aperture, which leads to the limitation of the number of resolvable signals and DOA estimation accuracy based on this type of array direction finding method. [0003] At present, some sparse non-uniform linear arrays have proposed new ideas for high-precision DOA estimation, typical ones are: minimum redundant array (MRA), minimum hole array (MHA), nested array (NA) and coprime array (CP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S3/782G01S3/802
CPCG01S3/143G01S3/782G01S3/8027
Inventor 赵嫔姣胡国兵陈正宇陈恺张清
Owner JINLING INST OF TECH
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