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A New Indoor Positioning System Architecture Using GPS Signals.

Rui Xu1, Wu Chen2, Ying Xu3

  • 1The Hong Kong Polytechnic University, Hong Kong, China. ruixu.nj@gmail.com.

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Summary

This study introduces a novel pseudolite system for indoor positioning. It enables standard Global Positioning System (GPS) receivers to achieve accurate indoor positioning without hardware modifications.

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Area of Science:

  • Navigation Systems
  • Indoor Positioning Technology
  • Signal Processing

Background:

  • Pseudolite systems offer advantages for indoor positioning, including wide coverage and accuracy.
  • Existing pseudolite systems often require modifications to standard Global Positioning System (GPS) receivers.
  • This limitation hinders the widespread adoption of pseudolite technology for indoor navigation.

Purpose of the Study:

  • To propose a new pseudolite-based indoor positioning system architecture.
  • To enable the use of common GPS receivers without hardware modifications.
  • To achieve accurate indoor positioning using GPS-like signals.

Main Methods:

  • The proposed system receives real-world GPS signals and retransmits them via indoor antennas.
  • A single clock synchronizes all transmitters (Tx) for consistent signal timing.
  • A software GPS receiver simulates the system's performance for validation.

Main Results:

  • The system successfully processes GPS-like signals using standard receiver functions (acquisition, tracking, decoding).
  • High-accuracy horizontal positioning was demonstrated in both static and dynamic simulations.
  • No hardware modifications were needed for the user's GPS receiver.

Conclusions:

  • The developed pseudolite system architecture effectively overcomes the limitations of traditional systems.
  • It provides a viable solution for accurate indoor positioning using unmodified commercial GPS receivers.
  • This advancement facilitates broader implementation of GPS-based indoor navigation solutions.