Planar phased array-based two-dimensional beam scanning method

A beam scanning, plane phase technology, applied in the field of beam scanning, can solve the problems of unevenness and discrete scanning range, and achieve the effect of continuous scanning, improving diffraction efficiency, and simple and easy-to-understand model.

Inactive Publication Date: 2019-05-21
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention is a two-dimensional beam scanning method based on a planar phased array, which overcomes the d

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  • Planar phased array-based two-dimensional beam scanning method
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  • Planar phased array-based two-dimensional beam scanning method

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[0030] The embodiments of the present invention will be described below in conjunction with the drawings. However, the following examples are limited to explaining the present invention.

[0031] A two-dimensional beam scanning method based on a planar phased array of the present invention, the specific steps are as follows:

[0032] Step one, establish as figure 1 In the plane phased array scanning model shown, θ is the scanning elevation angle, φ is the scanning azimuth, N is the number of elements in the x direction, M is the number of elements in the y direction, select N=M=200, the wavelength of the incident light wave Is 532.8nm, d x And d y Respectively represent the distance between the elements in the x direction and the y direction, both of which are taken as half the wavelength. The electric field intensity pattern at a specific point in the far field can be expressed as the product of the pattern in the x direction and the y direction. The expression is as follows:

[00...

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Abstract

The invention discloses a planar phased array-based two-dimensional beam scanning method. According to the prior art, when a liquid crystal spatial light modulator is adopted to deflect a two-dimensional beam, only a limited deflection angle can be realized; a one-dimensional phase modulation diagram needs to be rotated; an entire scanning range is in sparse and uneven concentric circle distribution; and as a scanning angle increases, diffraction efficiency is seriously degraded, and as a result, problems such as a problem of failure to meet the practical requirements of capture, tracking andaiming (ATP) in spatial optical communication which require beam continuous scanning can be solved. With the method adopted, the problems of scanning range discreteness and uneven distribution can besolved, diffraction efficiency can be improved, and the requirements of practical application can be better met.

Description

technical field [0001] The invention relates to the technical field of beam scanning, in particular to a two-dimensional beam scanning method based on a planar phased array, which is mainly used for beam scanning based on a liquid crystal spatial light modulator. Background technique [0002] Beam scanning technology refers to the technology of precisely controlling the direction of the laser beam, and has a wide range of application backgrounds in many fields such as laser communication, spacecraft, biomedicine and military affairs. With the mature laser technology and the global overall development of informatization, the space laser communication technology with the advantages of large communication capacity, small size, low power consumption and good confidentiality has been paid attention to. In space laser communication technology, Acquisition, Tracking and Targeting (ATP) of communication terminal is one of its key technologies, and it is also an important guarantee f...

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Application Information

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IPC IPC(8): G02B27/00G02F1/133H04B10/548
Inventor 胡婕杜升平郭弘扬任曦
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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