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Related Experiment Video

Updated: Aug 10, 2025

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Frequency Comb-Based Ground-Penetrating Bioradar: System Implementation and Signal Processing.

Di Shi1, Gunnar Gidion1, Taimur Aftab1

  • 1Laboratory for Electrical Instrumentation and Embedded Systems, Department of Microsystems Engineering-IMTEK, University of Freiburg, Georges-Köhler-Allee 106, 79110 Freiburg, Germany.

Sensors (Basel, Switzerland)
|February 11, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel frequency comb continuous wave (FCCW) bioradar for detecting breathing through building materials. The system, integrated with software-defined radio, shows promise for search and rescue operations.

Keywords:
bioradarfrequency combground-penetratingrange gatingrespiration detectionsearch and rescuesignal processingsoftware-defined radio

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Area of Science:

  • Radar Systems Engineering
  • Biomedical Sensing
  • Remote Sensing Technology

Background:

  • Radars offer potential for detecting vital signs of individuals trapped under debris.
  • Existing broadband radar systems like ultra-wideband (UWB) and frequency-modulated continuous wave (FMCW) require channel synchronization.
  • Step frequency continuous wave (SFCW) radar has limitations in scan rate for rapid detection.

Purpose of the Study:

  • To implement and evaluate a novel frequency comb continuous wave (FCCW) bioradar module.
  • To demonstrate the capability of FCCW radar for detecting human respiration through nonmetallic building materials.
  • To explore the integration of FCCW bioradar into unmanned aircraft systems for search and rescue.

Main Methods:

  • Utilized a commercial software-defined radio (SDR) to implement the FCCW bioradar module.
  • Employed frequency domain-based data acquisition, eliminating the need for transmit-receive channel synchronization.
  • Applied inverse fast Fourier transform (IFFT) for signal decomposition, range-based separation, and interference removal.

Main Results:

  • Successfully detected centimeter-range chest wall motions indicative of respiration.
  • Demonstrated detection of an alive person through various nonmetallic building materials using a 1.3 GHz center frequency FCCW bioradar.
  • Achieved a high effective scan rate due to the instantaneous wide bandwidth of the frequency comb.

Conclusions:

  • The developed FCCW bioradar is effective for detecting human vital signs through obstacles.
  • The system's lack of synchronization requirements and high scan rate make it suitable for rapid search and rescue.
  • Integration with unmanned aircraft systems presents a viable solution for enhanced disaster response capabilities.