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Time-of-Flight Microwave Camera.

Gregory Charvat1, Andrew Temme2, Micha Feigin1

  • 1Massachusetts Institute of Technology Media Lab, 75 Amherst St., Cambridge, Massachusetts, USA, 02139.

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Summary
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This study presents a novel multispectral microwave imaging system. It overcomes resolution and "stealth" region challenges for practical, camera-like microwave imaging of everyday objects.

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Area of Science:

  • Applied Physics
  • Electromagnetics
  • Imaging Science

Background:

  • Microwave imaging offers penetration through opaque materials but faces limitations in resolution and "stealth" regions due to specularity.
  • Conventional microwave imaging systems struggle with achieving high lateral and depth resolution.

Purpose of the Study:

  • To demonstrate a multispectral time-of-flight microwave imaging system that addresses resolution and "stealth" limitations.
  • To enable "camera-like" functionality for microwave imaging of everyday objects.

Main Methods:

  • Utilized a large passive aperture for improved lateral resolution.
  • Employed multiple illumination points and data fusion to mitigate "stealth" regions.
  • Incorporated a frequency modulated continuous wave (FMCW) receiver for depth resolution.

Main Results:

  • Achieved a lateral resolution of 1.5 degrees and a time resolution of 200 ps (6 cm).
  • Captured multispectral images across the X frequency band (8-12 GHz).
  • Successfully imaged objects in free space and behind materials like drywall and plywood.

Conclusions:

  • The developed microwave imaging system effectively overcomes key challenges in the field.
  • This technology offers practical, "camera-like" microwave imaging capabilities for diverse applications.