Liquid crystal phased array wave control data determination method based on wave surface iteration

A technology of data determination and liquid crystal phase, which is applied in static indicators and other directions, can solve the problems of low wave control accuracy and no significant increase in the number of deflection angles, and achieve the effect of satisfying high precision

Inactive Publication Date: 2011-09-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, there are relatively few studies on wave control accuracy. David proposed a method to obtain high-precision beam scanning by optimizing the phase offset
This method can reduce the accuracy error of the deflection angle to a certain extent, but the number of deflection angles that can be achieved is not significantly improved.

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  • Liquid crystal phased array wave control data determination method based on wave surface iteration
  • Liquid crystal phased array wave control data determination method based on wave surface iteration
  • Liquid crystal phased array wave control data determination method based on wave surface iteration

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Embodiment Construction

[0046] In order to verify the feasibility of the present invention, a specific implementation of the present invention is given below in combination with a simulation example, and the simulation results are compared and analyzed, and its performance is compared with that of the traditional wave control method.

[0047] Assuming that the number of steps that can be realized by the liquid crystal phased array is M=4, the laser wavelength is 1.064 μm, the total number of electrodes (that is, the number of liquid crystal phased array units) is N=64, and the electrode spacing d is 5 μm. According to formula (2) and formula (3) calculated in 0 ~ θ spot The deflection angle achieved within the range and the theoretical deflection angle, where θ spot = λ Nd Indicates the far-field beamwidth.

[0048] image 3 Among them, the deflection angle achieved by the traditional wave control method is quite inconsist...

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Abstract

The invention relates to a liquid crystal phased array wave control data determination method based on wave surface iteration, which belongs to the technical field of laser phased array radar and relates to liquid crystal phased array wave beam control. The method mainly comprises the following steps of: (1) calculating an emergency stage wave surface by using a traditional wave control method according to a deflexion angle required to be obtained; (2) calculating an average slope of the stage wave surface and an ideal linear wave surface to obtain an average slope error; (3) recording a stepedge position included in the stage wave surface and calculating the change of the average slope of each step edge after translation; and (4) judging whether the change of the average slope after thetranslation of the step reduces the average slope error or not; and if so, judging whether the step edges are moved leftwards or rightwards and carrying out iteration; and if not, stopping the iteration. By utilizing the relation of the average slope of the emergency stage wave surface of the liquid crystal phased array and the angle error, the invention obtains high-precision wave control data through the translation of the step edges, and can realize wave beam scanning with higher precision and more angles in comparison with the traditional wave control method.

Description

technical field [0001] The invention belongs to the technical field of laser phased array radar, and relates to liquid crystal phased array beam control, in particular to a method for determining beam control data (that is, voltage code) of liquid crystal phased array. Background technique [0002] Liquid crystal phased array technology is a new type of phased array technology, which uses the electronically controlled birefringence characteristics of liquid crystals, that is, by loading different voltage values ​​to control the birefringence of liquid crystals, so as to realize the phase modulation of light waves to achieve the beam. deflection. Compared with the traditional microwave phased array, it has the characteristics of low cost, light weight, low driving voltage and high pointing accuracy, and can be used in beam control, beam scanning, laser communication and other fields. In addition, it is more suitable for applications where the deflection angle is required to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133
Inventor 孔令讲朱颖宋艳杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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