Electromagnetic vortex imaging method under single-antenna receiving condition

Abstract

The invention provides an electromagnetic vortex imaging method under a single-antenna receiving condition. The technical scheme comprises the following steps: S1, N identical antennas are evenly distributed on a circumference to form a transmitting array; S2, electromagnetic vortexes of different frequencies and different orbital angular momentum modes are transmitted in turn using the transmitting array, and a single antenna in the center of the transmitting array receives each target echo, wherein the amplitude and phase information of the target echo received constitute frequency-orbital angular momentum mode two-dimensional echo data; S3, phase compensation is made for the received two-dimensional echo data according to the prior information of the parameters of the transmitting array and the elevation angle of a target to get preprocessed two-dimensional echo data; and S4, two-dimensional Fourier transform is carried out on the preprocessed two-dimensional echo data to get a distance-azimuth two-dimensional image of the target. The receiving process is simple. The method is easy to implement. Reference can be provided for the development of target recognition and new-system radar imaging technologies.

Description

technical field [0001] The present invention relates to the technical field of microwave imaging, in particular to the electromagnetic vortex imaging technology, and more specifically to the electromagnetic vortex imaging by using a single antenna to receive echoes. Background technique [0002] Radar imaging technology is not limited by natural conditions, and has very important applications in the fields of space target monitoring, remote sensing mapping, and ocean observation. Most of the existing high-resolution imaging radars are based on the range-Doppler principle, and the azimuth resolution depends on the viewing angle range of the radar. In practical applications, it is sometimes necessary to conduct long-term uninterrupted stationary observations of a key area. Under such staring observation conditions, it is difficult to obtain high azimuth resolution by imaging techniques under the range-Doppler framework. [0003] Orbital angular momentum is an important physic...

AI Technical Summary

Problems solved by technology

In the case of array reception, each antenna needs to receive the echo signal at the same time, and the time synchronization accuracy between the antennas has a great impact on the imaging quality, which is more complicated to implement

When the target elevation angle is small, direct imaging processing of the echoes received by a single antenna cannot resolve the target azimuth

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