Ka Band Holographic Imaging System Based on Linear Frequency Modulation Radar

Area of Science:

• Applied physics
• Radar technology
• Holographic imaging

Background:

• Millimeter wave (MMW) technology is increasingly used for security screening.
• Existing systems face challenges in real-time 3D imaging of concealed items.
• MMW offers safe, non-ionizing radiation that penetrates clothing effectively.

Purpose of the Study:

• To develop a novel planar millimeter wave (MMW) system for simultaneous 3D imaging of both sides of a person.
• To utilize a generalized holographic reconstruction algorithm for real-time image generation.
• To assess the system's spatial resolution and sensitivity for security screening applications.

Main Methods:

• Implementation of a Ka-band planar system using low-cost linear frequency modulation (LFM) radar.
• Development of a simple and efficient system calibration method.
• Real-time image reconstruction using a generalized holographic algorithm.

Main Results:

• The system achieves a spatial resolution of 6 mm or better for non-obscured items.
• Resolution may slightly decrease to 7 mm when items are hidden by clothing.
• Confirmed spatial sensitivity of at least 2 mm for detecting concealed objects.

Conclusions:

• The developed MMW system provides effective real-time 3D imaging for security screening.
• The system demonstrates promising spatial resolution and sensitivity, even with clothing concealment.
• This technology enhances the capability for detecting dangerous items.