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Orthogonal Chirp-Based Ultrasonic Positioning.

Mohammad Omar Khyam1, Shuzhi Sam Ge2, Xinde Li3,4

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117580, Singapore. m.khyam@unswalumni.com.

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|April 28, 2017
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Summary
This summary is machine-generated.

This study introduces an ultrasonic positioning system (UPS) using orthogonal chirp waveforms for efficient spectrum use. The system achieves high accuracy, with root-mean-square errors of 4.54 mm for precise indoor positioning.

Keywords:
multiple accessorthogonal chirptime-of-flightultrasonic indoor positioning

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Area of Science:

  • Signal Processing
  • Acoustic Systems
  • Wireless Positioning

Background:

  • Efficient spectrum utilization is crucial for multiple transmitter systems.
  • Orthogonal chirp waveforms offer advantages for signal multiplexing and positioning.
  • Existing ultrasonic positioning systems face challenges in simultaneous transmissions.

Purpose of the Study:

  • To present a novel chirp-based ultrasonic positioning system (UPS) utilizing orthogonal chirp waveforms.
  • To enable simultaneous transmissions from multiple transmitters for enhanced spectral efficiency.
  • To evaluate the performance and accuracy of the proposed system in an indoor environment.

Main Methods:

  • Utilizing orthogonal chirp waveforms for simultaneous multi-transmitter communication.
  • Applying oversampling methodology inspired by orthogonal frequency-division multiplexing (OFDM).
  • Conducting correlation analysis, simulations, and experimental evaluations for ultrasonic positioning.

Main Results:

  • Demonstrated efficient utilization of the available frequency spectrum.
  • Achieved positioning root-mean-square errors (RMSEs) of 4.54 mm within a 1000 mm range.
  • Reported a 90% error of 6.68 mm, indicating high accuracy in indoor environments.

Conclusions:

  • The proposed orthogonal chirp waveform-based UPS efficiently utilizes the frequency spectrum.
  • The system demonstrates high accuracy for indoor ultrasonic positioning applications.
  • This method offers a robust solution for multi-transmitter positioning scenarios.