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A Multitask Network for People Counting, Motion Recognition, and Localization Using Through-Wall Radar.

Junyu Lin1, Jun Hu1, Zhiyuan Xie1

  • 1School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China.

Sensors (Basel, Switzerland)
|October 14, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel multitask network for through-wall radar (TWR) systems. The network accurately performs people counting, action recognition, and localization simultaneously, enhancing safety and rescue operations.

Keywords:
Doppler signaturelocalizationmotion recognitionpeople countingresidual attention networkthrough-wall radar

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Area of Science:

  • Radar Systems Engineering
  • Artificial Intelligence in Security
  • Signal Processing

Background:

  • Through-wall radar (TWR) utilizes low-frequency electromagnetic waves for penetrating detection, crucial for public safety, counterterrorism, and disaster rescue.
  • Current TWR research often focuses on single tasks like detection or counting, limiting comprehensive situational awareness.
  • Practical TWR applications demand simultaneous people counting, action recognition, and precise localization.

Purpose of the Study:

  • To develop and validate a multitask network capable of concurrently executing people counting, action recognition, and localization using TWR data.
  • To process range-time-Doppler (RTD) spectra from 1D radar signals for comprehensive human activity analysis.
  • To address the limitations of single-task TWR systems by offering integrated people monitoring capabilities.

Main Methods:

  • A multitask deep learning network employing convolutional layers and attention modules was designed to process RTD spectra.
  • Confidence matrices were generated, encoding people count, motion category, and location information as labels.
  • A summed individual task loss function was formulated, converting the localization problem into a multilabel classification task.

Main Results:

  • The multitask network achieved 96.94% accuracy in people counting and 96.03% in motion recognition on a test set of 10,032 samples.
  • The system demonstrated an average distance error of 0.12 m for localization through a 24 cm thick brick wall.
  • The proposed method effectively extracts deep features for simultaneous multi-task TWR analysis.

Conclusions:

  • The developed multitask network offers a robust and accurate solution for integrated people counting, action recognition, and localization in through-wall scenarios.
  • This approach significantly advances the capabilities of TWR systems for enhanced public safety and emergency response.
  • The findings highlight the potential of deep learning and attention mechanisms in complex radar signal processing for real-world applications.