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Double-hole co-prime array antenna structure

An array antenna and antenna structure technology, which is applied in the field of double-hole coprime array antenna structure, can solve the problems of loss of degrees of freedom, etc., and achieve the goals of reducing the number of antenna elements, flexible and simple antenna layout, good angle estimation performance and spatial resolution Effect

Active Publication Date: 2021-01-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difference co-array (Difference co-array) produced by the existing coprime array (Difference co-array), that is, the virtual array, the existing holes lead to a lot of loss of available degrees of freedom

Method used

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  • Double-hole co-prime array antenna structure
  • Double-hole co-prime array antenna structure
  • Double-hole co-prime array antenna structure

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Embodiment Construction

[0022] The present invention is described in further detail now in conjunction with accompanying drawing.

[0023] The invention discloses a Coprime array with a two-hole difference co-array (CATHDC) antenna structure. The structure is composed of four sparse sub-arrays, the total number of array elements is T, and the number of antennas is N, and M, wherein N and M=3 are coprime integers, M in and d≤λ / 2 is the unit array element spacing, λ is the carrier wavelength,

[0024] Table 1 shows the parameters of the relevant sparse array structure required by this patent, including array layout, continuous DOF ​​(uDOF), weight function w(1), w(2), w(3) and coupling rate, where TCA represents de Redundant coprime array (thinned coprime array), kECA is k-time extended coprime array (k-time extended coprime array), CCA is complementary coprime array (complementary coprime array), NA is two-level nested array (nested array) ), SNA2 is a 2-order super nested array (2-order sup...

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Abstract

A double-hole co-prime array antenna structure is composed of four sparse sub-arrays, the total number of array elements is T, the number of antennas is N and M respectively, N and M are co-prime integers, and M is smaller than N. The array element in the CATHDC antenna structure is as shown in the description, d is smaller than or equal to [lambda] / 2, and is the unit array element interval, and [lambda] is the carrier wavelength, the antenna aperture is expanded, the mutual coupling effect is weakened, the antenna array layout is simple, and the degree of freedom higher than that of an existing co-prime array can be obtained. A virtual array generated by the CATHDC is a uniform array with unit array element spacing, a classical signal arrival angle estimation algorithm can be directly applied in combination with a spatial smoothing method, and the problem of angle ambiguity is avoided.

Description

technical field [0001] The invention belongs to the field of array antenna layout, and in particular relates to a dual-hole coprime array antenna structure. Background technique [0002] The traditional antenna layout is limited by the half-wavelength, that is, the distance between the array elements is smaller than half-wavelength. Therefore, when the number of antennas is fixed, the aperture of the antenna is limited. At the same time, small array elements will also lead to a strong mutual coupling effect between antenna elements. In addition, the number of targets that can be identified by traditional DOA estimation algorithms is limited by the number of antenna elements in the physical array, that is, degrees of freedom. When the number of targets exceeds the number of antenna elements, many algorithms will fail. [0003] At present, a kind of antenna structure layout called coprime array has received extensive attention. Its element spacing breaks through the half-wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q21/00H01Q1/36H01Q3/00H01Q3/02
CPCH01Q1/36H01Q3/005H01Q3/02H01Q21/00
Inventor 郑旺张小飞李建峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS