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MA-RTI: Design and Evaluation of a Real-World Multipath-Assisted Device-Free Localization System.

Marco Cimdins1, Sven Ole Schmidt1, Fabian John1

  • 1Department of Electrical Engineering and Computer Science, Technische Hochschule Lübeck, Mönkhofer Weg 239, 23562 Lübeck, Germany.

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Summary

Device-free localization (DFL) systems can now be easily deployed indoors using the proposed modular system. This system utilizes multipath-assisted radio-tomographic imaging (MA-RTI) for accurate obstacle detection and localization.

Keywords:
MQTTchannel impulse responsedevice-free localizationmultipath componentsmultipath-assistedradio tomographic imagingraytracingsystem architectureultra-wideband

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Area of Science:

  • Wireless Sensor Networks
  • Indoor Localization
  • Radio Tomography

Background:

  • Device-free localization (DFL) systems detect and locate obstacles using radio frequency channel changes.
  • Current DFL systems are difficult to deploy outside labs due to complex configuration and lack of modularity.

Purpose of the Study:

  • To propose and evaluate a modular and easy-to-set-up DFL system for indoor environments.
  • To address the challenges of DFL system deployment in real-world settings.

Main Methods:

  • Developed MA-RTI, a modular DFL system using a multipath-assisted radio-tomographic imaging algorithm.
  • Implemented an architectural model for modularity and a 3D spatial model to minimize configuration overhead.
  • Utilized ultra-wideband (UWB) technology and channel impulse responses (CIRs) for measurements.

Main Results:

  • The DFL system achieved an update rate of approximately 46 Hz after pre-processing.
  • Localization accuracy was 1.0 m in 50% of cases and 1.8 m in 80% of cases.
  • The system was successfully deployed and evaluated in a real-world office environment with four sensor nodes.

Conclusions:

  • The proposed MA-RTI system offers a practical solution for indoor DFL deployment.
  • The modular architecture and 3D spatial model simplify system setup and configuration.
  • While MA fingerprinting offers higher accuracy, it requires extensive training, making MA-RTI a more accessible alternative.