Computational imaging with low-order OAM beams at microwave frequencies

Area of Science:

• Electromagnetics
• Computational Imaging
• Radar Technology

Background:

• Vortex electromagnetic waves possess unique wavefront characteristics.
• Orbital angular momentum (OAM) beams offer potential for advanced radar imaging applications.
• Existing radar imaging techniques face limitations in measurement requirements and resolution.

Purpose of the Study:

• To develop a computational imaging model utilizing OAM waves for target reconstruction with limited measurements.
• To propose a novel measurement matrix and reconstruction method in Cartesian coordinates.
• To validate the super-resolution imaging capability of OAM-based computational imaging through simulations and experiments.

Main Methods:

• A computational imaging model was constructed using OAM waves.
• A specific measurement matrix was designed for OAM-based imaging.
• A target reconstruction algorithm was developed and implemented in Cartesian coordinates.
• Simulations were performed to assess noise robustness.
• Outdoor experiments were conducted to verify imaging performance.

Main Results:

• The proposed computational imaging approach demonstrated robustness against noise.
• Simulations confirmed the feasibility of target reconstruction with limited measurements.
• Outdoor experiments validated the super-resolution imaging ability of the OAM-based technique.
• Experimental results aligned well with theoretical predictions.

Conclusions:

• OAM-based computational imaging offers a promising approach for radar sensing.
• The developed technique enables high-resolution target reconstruction with reduced measurement data.
• This research advances the field of OAM-based sensing technologies.