Near-field three-dimensional radar imaging techniques and applications.

Area of Science:

• Electromagnetics and Applied Physics
• Signal Processing
• Imaging Science

Background:

• Near-field imaging utilizes active radar transceivers across a broad frequency spectrum (100 MHz to >350 GHz).
• Applications include radar cross-section imaging, concealed weapon detection, ground penetrating radar, through-barrier imaging, and nondestructive evaluation.
• Existing techniques often face limitations in resolution and illumination quality.

Purpose of the Study:

• To present novel three-dimensional (3D) radio frequency (RF) imaging techniques.
• To describe computational wavefront reconstruction methods for enhanced image quality.
• To showcase the application of these 3D RF imaging techniques.

Main Methods:

• Development of 3D imaging systems using rectilinear and cylindrical configurations.
• Employment of active radar transceivers operating at application-specific frequencies.
• Utilization of computational wavefront reconstruction algorithms for image processing.

Main Results:

• Demonstration of 3D RF imaging capabilities in various near-field scenarios.
• Optimized resolution and illumination quality achieved through computational wavefront reconstruction.
• Successful application results presented for diverse imaging tasks.

Conclusions:

• 3D RF imaging techniques, particularly with computational wavefront reconstruction, provide significant advancements in near-field sensing.
• The described rectilinear and cylindrical methods are versatile and applicable to a range of critical applications.
• Further development in this area promises enhanced capabilities for detection and evaluation.