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Millimeter wave imaging system modeling: spatial frequency domain calculation versus spatial domain calculation.

Feng Qi1, Vahid Tavakol, Ilja Ocket

  • 1Division ESAT-TELEMIC, Katholieke Universiteit Leuven, Kasteelpark Arenberg 10, Leuven-Heverlee, 3001, Belgium. feng.qi@esat.kuleuven.be

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|December 26, 2009
PubMed
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This study compares two simulation methods for active millimeter wave imaging systems. Spatial domain calculations are more accurate for rough objects, especially considering near-field effects in indoor applications.

Area of Science:

  • Physics
  • Electromagnetics
  • Imaging Science

Background:

  • Active millimeter wave (MMW) imaging is a key technology for security and industrial inspection.
  • A gap exists in system-level simulation tools for MMW imaging.
  • Existing simulation methods require evaluation for accuracy and applicability.

Purpose of the Study:

  • To introduce and evaluate two distinct modeling approaches for active millimeter wave imaging systems.
  • To compare the accuracy of spatial frequency domain and spatial domain calculations.
  • To assess the suitability of these models for indoor applications and industrial inspection.

Main Methods:

  • Developed two modeling approaches: one based on Fourier optics (spatial frequency domain) and another on wave propagation (spatial domain).

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  • Compared simulation results for both smooth and rough objects.
  • Incorporated near-field effects into the spatial domain model for indoor scenarios.

    • Main Results:

    • Spatial frequency domain calculations showed significant amplitude errors (up to 50%) for rough objects.
    • Spatial domain calculations, including near-field effects, provided more accurate results, particularly for indoor applications.
    • The study highlights the need for careful application of concepts like point-spread function and f-number in coherent MMW imaging.

    Conclusions:

    • The spatial domain modeling approach is more robust and accurate for active millimeter wave imaging, especially with rough surfaces and in near-field conditions.
    • Accurate system-level simulation tools are crucial for advancing MMW imaging applications in security and industry.
    • Further research should focus on refining spatial domain models to encompass complex scenarios in MMW imaging.