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Near-Field Three-Dimensional Planar Millimeter-Wave Holographic Imaging by Using Frequency Scaling Algorithm.

Ye Zhang1, Bin Deng2, Qi Yang3

  • 1College of Electronic Science, National University of Defense Technology, Changsha 410073, China. fighting_zy10@126.com.

Sensors (Basel, Switzerland)
|October 28, 2017
PubMed
Summary

A new 3D frequency scaling algorithm (FSA) enhances near-field millimeter-wave (MMW) holographic imaging. This fast FSA improves accuracy and efficiency for MMW imaging by correcting range cell migration without interpolation.

Keywords:
3-D holographic imagingfrequency scaling algorithmmillimeter-wavenear-field

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Signal Processing
  • Imaging Science

Background:

  • Near-field millimeter-wave (MMW) holographic imaging presents challenges in accurately reconstructing images due to complex wave phenomena.
  • Conventional Range Migration Algorithms (RMA) often neglect the cross-range range coupling term, limiting imaging performance.
  • Achieving a large depth of focus is crucial for practical MMW imaging applications.

Purpose of the Study:

  • To present a fast three-dimensional (3-D) frequency scaling algorithm (FSA) for near-field planar millimeter-wave (MMW) holographic imaging.
  • To address and correct the cross-range range coupling term in MMW holographic imaging.
  • To improve the efficiency and accuracy of MMW holographic imaging compared to conventional methods.

Main Methods:

  • Development of a 3-D frequency scaling operator to eliminate space-varying range cell migration.
  • Implementation of a range migration correction factor to compensate for residual migration.
  • Utilizing chirp multiplications and fast Fourier transforms (FFTs) for efficient signal processing.
  • Performing matched filtering in the cross-range direction for final image reconstruction.

Main Results:

  • The proposed 3-D FSA effectively corrects range cell migration without interpolation for de-chirped signals.
  • The algorithm demonstrates comparable accuracy to conventional RMA but with significantly improved computational efficiency.
  • Satisfying imaging results were achieved through both simulation and experimental validation.

Conclusions:

  • The novel 3-D FSA offers an efficient and accurate solution for near-field planar MMW holographic imaging.
  • The algorithm's ability to handle the cross-range range coupling term enhances imaging fidelity.
  • This advancement holds promise for improved MMW imaging systems and applications.