Frequency selection based two-dimensional imaging method of whirling electromagnetic waves

By selecting the optimal frequency to cover the elevation angle in vortex electromagnetic wave imaging, the problem of resolution degradation in vortex electromagnetic wave imaging technology is solved, achieving high-resolution imaging within different elevation angle ranges and improving imaging quality.

CN117289264BActive Publication Date: 2026-07-21NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2023-09-21
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing vortex electromagnetic wave imaging technology suffers from frequency divergence, which degrades the target resolution at different elevation angles, affecting the imaging signal-to-noise ratio and azimuth resolution.

Method used

The initial elevation angle of the target is obtained by estimating the direction of arrival, the optimal imaging frequency is determined, the main lobe of the vortex electromagnetic beam covers the elevation angle, and range-azimuth two-dimensional imaging is performed at this frequency. For multi-target scenes, the imaging results are fused to optimize the imaging performance.

Benefits of technology

It effectively solves the resolution degradation problem caused by vortex electromagnetic beam divergence, achieves the most ideal azimuth resolution in different elevation ranges, and improves imaging performance.

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Abstract

The application discloses a frequency selection based two-dimensional imaging method of vortex electromagnetic waves, and belongs to the technical field of radar imaging. The method of the application firstly obtains a preliminary pitch angle of a target through a direction of arrival estimation method; determines a best imaging frequency corresponding to the pitch angle, wherein the best imaging frequency refers to a vortex electromagnetic wave working frequency which enables a main lobe of a vortex electromagnetic wave beam under a maximum mode number to cover the pitch angle; and excites the vortex electromagnetic waves to perform distance-azimuth two-dimensional imaging on the target by taking the determined best imaging frequency as a working frequency. The application further discloses a frequency selection based two-dimensional imaging device of vortex electromagnetic waves. Compared with the prior art, the application can effectively solve the problem of resolution deterioration of targets at different pitches caused by the divergence of vortex electromagnetic wave beams, and the most ideal azimuth resolution can be achieved within different pitch ranges.
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