Array beam forming method based on directional diagram reconstruction unit

A pattern reconstruction and pattern technology, applied in the field of electromagnetic waves, can solve the problem of lack of a good pattern optimization method, and achieve the effect of lowering the side lobe level and improving the gain.

Active Publication Date: 2020-07-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At present, the selection of different pattern patterns of array elements is mainly done by experience. Usually, all units choose the same pattern pattern, and there is no better pattern pattern optimization method to assist in pattern optimization.

Method used

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  • Array beam forming method based on directional diagram reconstruction unit
  • Array beam forming method based on directional diagram reconstruction unit
  • Array beam forming method based on directional diagram reconstruction unit

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Embodiment Construction

[0024] Taking the line array antenna as an example, the theoretical process of the planar array antenna can be deduced by analogy. Assuming that the antenna has N array elements with K different pattern patterns (uniform or non-uniform) with arbitrary distribution characteristics, then when the array antenna receives signals, the combined electric field strength of the array antenna can be described as:

[0025]

[0026] where w n 、a n (θ) and E n,k (θ) are respectively the complex weight coefficient of the nth array element factor, the array factor, and the far-field electric field intensity corresponding to the kth pattern pattern, and the azimuth angle θ∈[0°,180°].

[0027] Vectorize the above formula to get:

[0028] f(θ)=e a (θ)w (2)

[0029] Among them, the array weight coefficient vector composed of N array element weight coefficients e a (θ)=a(θ)⊙e N,K (θ), a(θ)=[a 1 (θ)...a n (θ)...a N (θ)] H , e a (θ) is the product of the array factor of N units a...

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Abstract

The invention provides an array beam forming method based on a directional diagram reconstruction unit. The method comprises the following steps: 1) an initialization step; and 2) an iteration step: firstly, solving a convex optimization problem by traversing all different directional diagram combination modes, then, taking a directional diagram mode combination with the minimum sidelobe level asan optimal directional diagram mode combination in an iteration process, and outputting the optimal directional diagram mode combination and a corresponding optimal array weight coefficient. Through optimal selection of the array unit directional diagram mode and optimal design of the array weight coefficient, self-adaptive matching of the directional diagram mode and array beam pointing is achieved, the sidelobe level of the array antenna is lowered, and the gain of the array antenna is improved.

Description

technical field [0001] The invention relates to electromagnetic wave technology, in particular to array beam forming technology. Background technique [0002] With its flexible beam scanning capability, array antennas are widely used in many fields related to national economy and people's livelihood, such as radar, communication, navigation, and remote sensing. In order to transmit or receive signals in different directions, the array antenna is generally required to have a wide-angle scanning capability. In order to realize this function, the industry proposes a radiation pattern reconfigurable antenna, which is an antenna capable of reconfiguring the radiation pattern while keeping the antenna frequency and polarization characteristics unchanged. Since the current distribution on the antenna radiating structure directly determines the characteristics of the antenna radiation pattern, selecting the various current distributions required and the method of switching between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q3/28
CPCH01Q3/28
Inventor 雷世文田径胡皓全丁孝翔林志鹏陈波杨伟唐璞何子远邱翔东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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