Electromagnetic vortex imaging method based on orbital angular momentum bimodal multiplexing
A technology of orbital angular momentum and imaging method, which is applied in the direction of measuring device, using re-radiation, radio wave measurement system, etc., can solve the problems of limiting the efficiency of electromagnetic vortex imaging, and achieve the effect of improving imaging efficiency
Active Publication Date: 2019-11-26
NAT UNIV OF DEFENSE TECH
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[0056] In order to facilitate the implementation of the present invention, further description will be given below in conjunction with specific examples.
[0057] refer to figure 1 , the present embodiment provides an electromagnetic vortex imaging method based on orbital angular momentum dual-mode multiplexing, comprising the following steps:
[0058] S1. Construct a uniform circular array for generating vortex electromagnetic waves carrying positive and negative dual-mode multiplexing.
[0059] refer to figure 2 , Arrange N identical transmitting antenna array elements at equal intervals on a circle with radius a to form a uniform circular array. One of the transmitting antenna elements is randomly selected as the initial transmitting element, and the azimuth angle of the initial transmitting element is set to zero degrees. Starting from the initial transmitting element, the transmitting antenna elements on the uniform circular array are sequentially numbered as 1, 2, 3,...
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The invention discloses an electromagnetic vortex imaging method based on orbital angular momentum bimodal multiplexing, which comprises the steps of firstly, constructing a uniform circular array, changing the frequency of an excitation signal transmitted by the uniform circular array and the number of the orbital angular momentum modals, and enabling the uniform circular array to sequentially generate vortex electromagnetic waves with different frequencies and different angular momentum modal multiplexing to irradiate a target; sequentially receiving target echo data of the vortex electromagnetic waves with different frequencies and different modal multiplexing by adopting a single receiving array element antenna, and performing phase compensation processing on the target echo data; andprocessing each piece of target echo data after phase compensation processing by adopting a Hilbert transform method, demodulating target information carried by a single orbital angular momentum modal, reconstructing frequency-single modal two-dimensional echo data, and then performing two-dimensional Fourier transform on the frequency-single modal two-dimensional echo data to obtain a target two-dimensional image. Compared with vortex electromagnetic wave imaging which does not utilize modal multiplexing and carries single modal orbital angular momentum in a traversing manner, the method reduces the orbital angular momentum traversal by half and improves electromagnetic vortex imaging efficiency.
Description
technical field [0001] The invention relates to the technical field of electromagnetic vortex imaging, in particular to an electromagnetic vortex imaging method based on dual-mode multiplexing of orbital angular momentum. Background technique [0002] As an all-weather, all-weather, and long-distance information acquisition method, radar high-resolution imaging has very important applications in the fields of space target monitoring, remote sensing mapping, and ocean observation. The existing high-resolution imaging radar mainly obtains high resolution in the range direction by transmitting broadband signals, and obtains high resolution in the azimuth direction by forming a large virtual synthetic aperture through the relative motion of the radar and the target. However, in practical applications, it is often necessary to conduct long-term uninterrupted staring observations on a certain key area, and the radar and the target are in relatively static observation geometric con...
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Login to View More IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 程永强刘红彦刘康王宏强王建秋
Owner NAT UNIV OF DEFENSE TECH