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Ultrasonic multiple-access ranging system using spread spectrum and MEMS technology for indoor localization.

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This study compares direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS) ultrasound for indoor localization. FHSS shows better robustness in multi-sender environments, while DSSS offers slightly higher accuracy in single-sender setups.

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Area of Science:

  • Engineering
  • Acoustics
  • Signal Processing

Background:

  • Indoor localization is a significant engineering challenge.
  • Ultrasound ranging systems utilize wideband techniques for localization.
  • Direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS) ultrasound signals offer high accuracy.

Purpose of the Study:

  • To investigate and compare a novel ranging method using FHSS with finite impulse response filtering against DSSS.
  • To evaluate localization performance in single- and dual-sender environments.

Main Methods:

  • Utilized micro-electromechanical systems as ultrasonic sensors.
  • Implemented senders using field-programmable gate arrays.
  • Compared DSSS and FHSS ultrasound ranging techniques in controlled experimental setups.

Main Results:

  • In a single-sender setup, DSSS demonstrated slightly superior accuracy and precision over FHSS.
  • In a dual-sender setup, FHSS proved more robust against near-far effects compared to DSSS.

Conclusions:

  • The choice between DSSS and FHSS for ultrasound localization depends on the specific environmental conditions.
  • FHSS is preferable in scenarios with multiple potential signal sources due to its enhanced robustness.