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Beam forming method based on time modulation array

A beamforming method and time modulation technology, applied in antenna arrays, electrical components, circuits, etc., can solve the problems of increasing the number of iterations of the calculation scale cycle, slow array optimization process, unsatisfactory results, etc., to improve the optimization ability The effect of descending, shortening optimization time, and increasing beamforming speed

Active Publication Date: 2015-03-25
XIDIAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the existing beamforming methods use the standard evolutionary algorithm to directly perform beam synthesis on the pattern. This method can obtain better results for simple one-dimensional beamforming problems, but for two-dimensional beamforming problems, due to The number of optimization variables is very large, which seriously increases the calculation scale and the number of loop iterations, making the array optimization process very slow, and the standard evolutionary algorithm can easily make the population premature and fall into a local optimal solution. not satisfied

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  • Beam forming method based on time modulation array
  • Beam forming method based on time modulation array
  • Beam forming method based on time modulation array

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Embodiment 1: The main lobe area of ​​the center frequency pattern is -0.3≤u≤0.3, -0.3≤v≤0.3, the dynamic range of the static excitation amplitude of the time modulation array is [0.1,1], and the dynamic range of the pulse duration is [0.1,1] set of parameters for beamforming.

[0035] Step 1: Set the target to be optimized.

[0036] Setting the target to be optimized includes: the level value E of the center frequency pattern to be shaped d , the dynamic range A of the static excitation amplitude of the time-modulated array ε and the dynamic range of the pulse duration t ε .

[0037] Step 2: Initialize Time Modulated Array Excitation I 0 .

[0038] Use the Woodward-Lawson sampling synthesis method to perform initial synthesis on the central frequency pattern to be shaped to obtain the array excitation, and use this array excitation as the initial excitation I of the time-modulated array 0 :

[0039] (2a) Calculate the spatial sampling position (u p ,v q ):

[...

Embodiment 2

[0100] Embodiment 2: the main lobe area of ​​the central frequency pattern is the Chinese map shape, the dynamic range of the static excitation amplitude of the time modulation array is [0.1,1], and the pulse duration dynamic range is [0.1,1] A set of parameters is carried out Beamforming.

[0101] Step 1: Set the target to be optimized.

[0102] Setting the target to be optimized includes: the level value E of the center frequency pattern to be shaped d ', the dynamic range A of the static excitation amplitude of the time-modulated array ε ' and the dynamic range of the pulse duration t ε '.

[0103] Step 2: Initialize Time Modulated Array Excitation I 0 '.

[0104] Use the Woodward-Lawson sampling synthesis method to perform initial synthesis on the central frequency pattern to be shaped to obtain the array excitation, and use this array excitation as the initial excitation I of the time-modulated array 0 ':

[0105] 2a) Calculate the spatial sampling position (u' p'...

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Abstract

The invention discloses a beam forming method based on a time modulation array. The beam forming method based on the time modulation array mainly solves the problems that the number of optimization variables of an existing time modulation array is large, the beam forming speed is low, the optimization capacity is poor, and the situation of running into a locally optimal solution occurs easily. The beam forming method based on the time modulation array includes the first step that a target to be optimized is set according to a system index; the second step that time modulation array stimulation is initialized according to a center frequency directional diagram to be formed; the third step that the center frequency directional diagram is optimized through an artificial bee colony algorithm in order to obtain final array stimulation; the fourth step that a first sideband frequency directional diagram is optimized through the artificial bee colony algorithm to obtain pulse beginning time and pulse duration; the fifth step that a final static stimulation amplitude and a phase of the time modulation array are isolated according to the final array stimulation and the pulse duration, and then beam forming is achieved. The beam forming method based on the time modulation array can reduce the number of the variables required by optimization of different frequency directional diagrams, is high in convergence rate, is high in global optimization capacity, enables people to jump out of the locally optimal solution easily and can meet the requirement of the time modulation array for beam forming.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to the shape optimization of array antenna pattern, which can be used for the pattern design of time modulation array antenna. Background technique [0002] In order to obtain a strong beamforming capability, traditional methods usually use reflector antenna technology. However, the processing of the reflector antenna is difficult, the volume is large, and the weight is heavy, which is not conducive to realization, and the ability to control the ripple coefficient and sidelobe level of the target radiation area is poor. Compared with the reflector antenna, the planar phased array antenna has a simple structure and is easy to process; it has wider azimuth and elevation scanning capabilities, a narrower beam and higher gain, and is easy to implement three-dimensional beamforming. These characteristics make the planar The phased array antenna has been paid more and more a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q21/00H01Q3/26
Inventor 李文涛杨京花丹黑永强史小卫
Owner XIDIAN UNIV