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Rapid and high-resolution imaging method based on OAM radar imaging system

A technology of radar imaging and imaging method, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation and other directions, can solve the problems of not being able to send multiple vortex electromagnetic waves at the same time, low imaging efficiency, etc. The effect of increased efficiency and low complexity

Inactive Publication Date: 2021-08-20
HEFEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, in the radar imaging system based on the MIMO model of vortex electromagnetic waves, since the scattered echoes of vortex electromagnetic waves to ideal scattering points are approximately regarded as spherical waves, multiple vortex electromagnetic waves cannot be simultaneously sent for imaging, resulting in poor imaging efficiency. high

Method used

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  • Rapid and high-resolution imaging method based on OAM radar imaging system
  • Rapid and high-resolution imaging method based on OAM radar imaging system
  • Rapid and high-resolution imaging method based on OAM radar imaging system

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Embodiment 1

[0035] This example introduces in detail the reconstruction of the target image using fast and high-resolution OAM-based radar imaging technology in conjunction with the accompanying drawings.

[0036] At the transmitting end, the UCA with N=41 is used to generate the vortex electromagnetic wave with the OAM state of 20, in (1000m, 0.25π, 0.5π) point normalized electric field strength is:

[0037]

[0038] The echo signal received by the nth array element can be expressed as:

[0039]

[0040] Add the vortex phase of the OAM state L (-19≤L≤20) to the echo signals received by these N array elements and add them up:

[0041]

[0042] At the transmitting end, the UCA generates a vortex electromagnetic wave whose OAM state is -20. The normalized electric field strength at a point is:

[0043]

[0044] The echo signal received by the nth array element can be expressed as:

[0045]

[0046] Add the vortex phase of the OAM state L (-20≤L≤20) to the echo signals r...

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Abstract

The invention discloses a rapid and high-resolution imaging method based on an OAM radar imaging system. The imaging method can obtain high imaging efficiency while having high resolution in the azimuth direction. Firstly, a transmitting end uses a UCA of N (N is an odd number) array elements to generate and transmit vortex electromagnetic waves in an OAM state, so that the imaging efficiency is greatly improved. Then, vortex phases of different OAM states are respectively added to the received echo signals, so that a relatively high azimuth resolution is obtained. Phase compensation is carried out, and target reconstruction is realized on the compensated echo signals through a 2FFT algorithm. According to the technology, high resolution in the azimuth direction can be kept while high imaging efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of vortex electromagnetic radar imaging, in particular to a fast and high-resolution imaging method based on an OAM radar imaging system. Background technique [0002] The vortex electromagnetic wave is applied in radar imaging, which can realize the resolution of the azimuth and direction of the target in the beam. In 1992, Allen et al. proved that a Laguerre-Gaussian beam with a helical wavefront carries orbital angular momentum (OAM). Subsequently, Turnbull et al. used the spiral phase plate (SPP) to generate vortex electromagnetic waves in the millimeter wave band for the first time. In 2013, Guo Guirong and others applied the vortex electromagnetic wave to the radar imaging system for the first time, realizing the resolution of the azimuth of the target within the beam. After years of research by researchers at home and abroad, in-depth research has been carried out on the radar imaging system based o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 郭忠义郭凯王运来
Owner HEFEI UNIV OF TECH
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