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A Near Field Array Beam Steering Method

A beam control and near-field technology, applied in the field of signal processing, can solve problems such as reduced accuracy, lack of flexibility, and long time to solve complex problems, and achieve the effect of improving flexibility

Active Publication Date: 2022-04-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has disadvantages. The convex optimization design is usually handed over to the computer for one-step solution. After the user enters the input, the output is obtained, and there are almost no other intermediate processes.
Although this method has high accuracy and can solve many complex problems, it lacks flexibility, and due to the characteristics of the convex optimization algorithm itself, it takes a long time to solve complex problems.
[0005] Although the above beam steering methods can solve the problem of weight vector design in beamforming to a certain extent, each has its own shortcomings, and it is difficult to achieve a good balance between time complexity and accuracy.
When the accuracy needs to be improved in the design, the high time cost generated makes it difficult to implement the deployment in the actual system; and the method adopted to improve the time efficiency will reduce the accuracy to a certain extent and weaken the effect of beamforming
And the above-mentioned beam control method can usually only be used for near-field beam control on a single plane. When it is necessary to control and design a beam in a section, the above-mentioned method cannot be realized.

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  • A Near Field Array Beam Steering Method
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  • A Near Field Array Beam Steering Method

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Experimental program
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Effect test

Embodiment 1

[0038] The purpose of this embodiment is to perform near-field beamforming at different focusing distances, and to verify that the low sidelobe beam control for a single focusing plane can be realized as proposed in the present invention. In this embodiment, the size of the array is 21×21 array elements, and the two-dimensional planar array with an interval of half a wavelength is carried out. The center point of the array is the point reference point labeled (11,11). For the points at 12λ, 15λ and 18λ A beamforming simulation with a maximum sidelobe gain of -30dB is carried out on the plane.

[0039] The beamforming simulation implementation method of the embodiment is as attached figure 1 shown. attached figure 2 Given the physical model used in this embodiment, since it only targets a single plane, only the focal plane is considered in the model of this embodiment. Since this method realizes global control based on iterative control, first in the attached image 3 The be...

Embodiment 2

[0041] The purpose of this embodiment is to perform near-field beamforming for a section, and to verify that the method proposed in the present invention can implement beam control with low sidelobe for the near-field section. In this embodiment, the size of the array is 21 × 21 array elements, and the two-dimensional planar array with a half-wavelength interval is carried out. The center point of the array is the point reference point labeled (11, 11), and the area included in 12λ-18λ is carried out. Beamforming simulation with maximum sidelobe gain of -30dB.

[0042] The beamforming simulation implementation method of the embodiment is as attached figure 1 shown. attached figure 2 Given the physical model used in this embodiment, the focal plane is selected as the plane at 15λ. The distance of plane 1 is 12λ, and the distance of plane 2 is 18λ, which represent the upper and lower bounds of the interval. . For the area included in 12λ-18λ, in this embodiment, a step siz...

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Abstract

The invention belongs to the technical field of signal processing, and relates to a beam control method based on a near-field array. The present invention first performs beamforming according to the initial weight vector to obtain the initial beam pattern, and on this basis, finds the maximum gain value point for iterative adjustment, and adjusts the maximum gain value point of the side lobe in the controlled plane or interval to the target in each iteration value until the side lobe area meets the design requirements, the obtained weight vector is the final result. Compared with the array element excitation weighting method and the convex optimization method, the invention has higher accuracy and flexibility, and has a good balance between the time complexity and the accuracy of the algorithm. The present invention can also perform interval beam control on the basis of single-plane beam control, and realize interval low sidelobe beam formation in a near-field scene.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a near-field array beam control method. Background technique [0002] With the development of array signal processing technology, near-field antenna array has become a hot topic under the background that the research on far-field antenna array is becoming more and more mature. Near-field antenna arrays have been widely used in microphone arrays, wireless charging technology, radio frequency identification technology, sonar, radar and other fields, involving people's daily life and even national defense. Results in far-field array studies can be transferred to conclusions in near-field conditions with limitations. An important issue in near-field array signal processing is how to design the weighting vector of the array so that it can meet different requirements. There are two methods currently being studied: the array element excitation weighting method and the convex o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04B7/08G06F17/16
CPCH04B7/0617H04B7/086G06F17/16
Inventor 潘延廖红舒甘露
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA