Radar target two-dimensional imaging method based on vortex electromagnetic wave

A vortex electromagnetic wave and radar target technology, which is applied in radio wave reflection/re-radiation, radio wave measurement system, utilization of re-radiation, etc., can solve the problem that OAM radar cannot realize pitch angle imaging, etc., and achieve high angle imaging resolution Effect

Active Publication Date: 2017-03-22
ZHEJIANG UNIV
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Problems solved by technology

[0005] The present invention proposes a radar target two-dimensional imaging method based on vortex electromagnetic waves, the purpose of which is to solve the problem that

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  • Radar target two-dimensional imaging method based on vortex electromagnetic wave
  • Radar target two-dimensional imaging method based on vortex electromagnetic wave
  • Radar target two-dimensional imaging method based on vortex electromagnetic wave

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The two-dimensional imaging method of the radar target based on the vortex electromagnetic wave proposed by the present invention, the specific embodiments are as follows:

[0033] The uniform loop antenna array is composed of Q=8 antennas, and an antenna is placed at the center of the array to receive the scattered echo signal of the target, and the transmitted signal s(t)=cos(2πf c t), signal frequency f c =2.4GHz, the corresponding wavelength λ=0.125m, and the array radius is d=10λ. The radar target is composed of M=2 ideal scattering points, and the position of each scattering point in the radar observation coordinate system can be expressed as Radar observation coordinate system such as figure 1 shown, specific

[0034]

[0035]

[0036] The scattering intensity σ of the scattering point 1 =1, σ 2 =1.

[0037] ...

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Abstract

The invention discloses a radar target two-dimensional imaging method based on vortex electromagnetic waves. The radar target two-dimensional imaging method is based on an echo model of ideal scattering points under projection of the vortex electromagnetic waves generated by a uniform loop antenna array, performs orbital angular momentum (OAM) mode sampling on radar target echo signals and calculates a related function, adopts a multiple signal classification (MUSIC) algorithm to obtain a spatial spectrum function, and carries out two-dimensional spectrum peak searching to realize two-dimensional joint detection of a pitch angle and an azimuth angle of a radar target. Compared with a traditional direction-of-arrival (DOA) estimation scheme based on a plane wave MUSIC algorithm, the radar target two-dimensional imaging method provided by the invention can realize higher angular resolution; and compared with an existing radar target azimuth angle imaging scheme based on vortex electromagnetic waves, the radar target two-dimensional imaging method can realize the imaging of the target pitch angle without increasing hardware cost, and is of great reference significance to the modern radar design of the new system.

Description

technical field [0001] The invention relates to the field of radar target imaging, in particular to a two-dimensional radar target imaging method based on vortex electromagnetic waves. Background technique [0002] The rapid development of wireless communication technology provides great convenience for efficient and fast information exchange in modern society. However, with the rapid growth of mobile device usage and the continuous emergence of new services, even if technologies such as multi-port and channel multiplexing are adopted to improve communication capacity, spectrum congestion problems caused by limited spectrum resources are still unavoidable. In the background of , Orbital Angular Momentum (OAM), as the basic physical quantity of the electromagnetic field, has theoretically infinite and mutually orthogonal modes, so it is hoped that it can solve the spectrum congestion problem of the wireless communication channel in the above-mentioned radio frequency segment....

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 张朝阳武华阳袁裕清
Owner ZHEJIANG UNIV
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