Three-dimensional object imaging with vortex wave tomography

Area of Science:

• Electromagnetics
• Wave Physics
• Radar Technology

Background:

• Vortex electromagnetic (EM) waves carrying orbital angular momentum (OAM) offer a new paradigm for object imaging.
• Exploiting the OAM index and azimuthal angle relationship enables reconstruction of object azimuth profiles.

Purpose of the Study:

• To propose a tomography vortex wave radar system for three-dimensional (3D) target information reconstruction.
• To leverage signal bandwidth, OAM degree of freedom, and tomographic techniques for enhanced imaging.

Main Methods:

• Generated vortex waves analyzed via intensity and wavefront distributions.
• Developed a 3D imaging model and a 2D imaging method to mitigate Bessel function modulation effects.
• Created 3D imaging algorithms for target localization in range, azimuth, and elevation.

Main Results:

• Demonstrated robust 3D imaging performance for multiple targets at various elevation angles.
• Achieved super-resolution in the azimuth dimension, validated by theoretical analysis.
• Presented generated vortex waves through intensity and wavefront analysis.

Conclusions:

• The tomography vortex wave radar effectively reconstructs 3D target information.
• This technology advances 3D imaging capabilities, particularly for stare illuminating scenarios.
• The system provides robust performance and azimuth super-resolution for complex target environments.