DOA tracking method based on sparse array

A sparse array, DOA technology, applied in the field of DOA tracking based on sparse array, can solve problems such as poor performance and general performance, and achieve the effect of improved accuracy and superior tracking performance

Pending Publication Date: 2021-12-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Although the PAST algorithm has advantages in computational complexity, its performance is relatively general, especially at low signal-to-noise ratios.

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  • DOA tracking method based on sparse array
  • DOA tracking method based on sparse array
  • DOA tracking method based on sparse array

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0027] Symbol representation: in the present invention, E(·) represents expectation, (·) H , (·) T , (·) * Respectively represent conjugate transposition, transpose, conjugate operation, . / represents element division, I m Represents the unit matrix of m×m, vec( ) represents vectorization, diag(a) represents a diagonal matrix composed of elements in vector a, ⊙ represents the Khatri-Rao product, Denotes the Kronecker product.

[0028] The present invention provides a nested array DOA tracking method. The array antenna structure used in the method consists of two array elements whose numbers are N respectively. 1 and N 2 The uniform array composition, the total number of array elements is N=N 1 +N 2 ,Such as figure 2 As shown, the array...

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Abstract

The invention discloses a DOA (Direction of Arrival) tracking method based on a sparse array, belongs to the field of DOA tracking, and is applied to a DOA tracking system consisting of passive array elements arranged in a certain form. The method specifically comprises the following steps: firstly, receiving a signal by using a sparse array to obtain measurement information at each moment, and carrying out virtualization processing on the received signal; then obtaining a DOA estimated value at the starting moment of the information source by using a DFT algorithm; constructing total least squares (TLS) through first-order Taylor expansion to obtain offset of adjacent moments; and finally, compensating the offset of two adjacent moments on the basis of the estimated angle to realize DOA tracking. The method can obtain very high estimation precision, achieves good compromise between performance and complexity, and has important application value.

Description

technical field [0001] The invention belongs to the field of direction of arrival (Direction of Arrival, DOA) tracking, and relates to a DOA tracking method based on a sparse array. Background technique [0002] Compared with traditional arrays, sparse arrays can obtain larger array apertures and higher degrees of freedom, so they have more advantages in spectral estimation accuracy and resolution. Taking the two-level nested array as an example, its construction method can be expressed as: it consists of two uniform linear arrays, and the number of elements of the first-level uniform linear array is N 1 , the array element interval is d, and the number of array elements of the second uniform linear array is N 2 , the array element interval is (N 1 +1) d. The array structure breaks through the half-wavelength limitation of the element spacing of the traditional antenna array, which expands the antenna aperture and improves the angle estimation performance. [0003] The e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G06F17/14G06F17/16
CPCG01S3/14G06F17/141G06F17/16
Inventor 张淇婷李建峰朱珂慧汤亚为
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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