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Intelligent incident wave direction detection method based on phase regulation metasurface

A detection method and metasurface technology, applied in radar and military fields, can solve problems such as inconvenience, and achieve the effects of high speed, simple control circuit and high efficiency

Pending Publication Date: 2021-07-09
ZHEJIANG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Traditional detection methods bring great inconvenience to both hardware and software

Method used

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  • Intelligent incident wave direction detection method based on phase regulation metasurface
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  • Intelligent incident wave direction detection method based on phase regulation metasurface

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Embodiment

[0031] Such as figure 1 As shown, according to the needs of actual engineering, the direction of the incident wave targeted by the method of the present invention is -60°≤θ≤60°,

[0032] Such as figure 1 As shown, the observation space of the incident wave detection method is mainly composed of a metasurface array that can dynamically adjust the transmitted wave and a receiving antenna. The metasurface is a phase-tunable transmissive metasurface. The receiving antenna is placed at an oblique rear position at a suitable distance from the metasurface.

[0033] Such as figure 2 As shown, in order to verify the incident wave direction detection method, the metasurface array in the present invention is composed of cells with a side length of 15mm arranged periodically, 40 cells in the x direction, 20 cells in the y direction, and the metasurface consists of 800 cells. Such as image 3 As shown, each unit includes four metal layers and three dielectric layers. The thickness...

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Abstract

The invention discloses an intelligent incident wave direction detection method based on a phase regulation metasurface, and aims to combine the phase regulation and control metasurface with a neural network calculation method to realize detection of the direction of an incident wave. The system is composed of an incident space, an observation space and an estimation space. A spherical coordinate system is adopted for representation of the incoming wave direction. The observation space is composed of a transmission type metasurface and a receiving antenna, wherein the transmission type metasurface is formed by periodically arranging sub-wavelength size units with adjustable phases. When the electromagnetic wave is incident, the metasurface of the observation space transforms a plurality of different phase distributions, and the receiving antenna receives corresponding amplitude data and sends the amplitude data into the neural network trained in advance to predict the direction of the incident wave. The receiving antenna is located at the oblique rear position of the metasurface. The metasurface formed by arranging the units with the thickness smaller than the wavelength is adopted to regulate and control electromagnetic waves, the receiving unit is only provided with one receiving antenna, equipment is simple and convenient to control and is suitable for development of the integration and miniaturization trend in the future.

Description

technical field [0001] The present invention relates to the fields of military and radar, in particular to a new type of intelligent incident wave direction detection method that uses deep learning as a calculation method to form a system composed of a phase-adjustable transmissive metasurface and a single receiving antenna. Background technique [0002] The direction detection of incident wave has always been a hot and difficult issue in military affairs. The term used in radar and military related fields is the direction of arrival positioning technology, and the classic methods mainly include beamforming technology, adaptive nulling technology and spatial spectrum estimation technology. It is inevitable that its equipment is based on phased array radar implementation. Phased array radar consists of hundreds or even tens of thousands of antennas. Each antenna unit is equipped with TR components and is controlled by an independent phase shift switch. By controlling the pha...

Claims

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14Y02D30/70
Inventor 黄敏郑斌陈红胜刘健
Owner ZHEJIANG UNIV
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