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A New DGNSS Positioning Infrastructure for Android Smartphones.

Duojie Weng1, Xingli Gan2,3, Wu Chen1

  • 1Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong M1504, China.

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This study introduces a new Differential Global Navigation Satellite System (DGNSS) infrastructure for smartphones. It enhances positioning accuracy to better than 2 meters without hardware changes, benefiting smart city applications.

Keywords:
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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Smart City Technologies

Background:

  • Smartphone Global Navigation Satellite System (GNSS) accuracy is typically 5-10 meters.
  • Existing mid- and low-end smartphones often lack raw GNSS data access, preventing Differential GNSS (DGNSS) use.
  • DGNSS technology, using reference stations, can achieve sub-meter accuracy with advanced receivers.

Purpose of the Study:

  • To develop a DGNSS infrastructure for correcting standalone smartphone GNSS positions using reference station data.
  • To enable DGNSS capabilities on common smartphones without requiring advanced hardware.
  • To efficiently serve a large user base with improved positioning accuracy.

Main Methods:

  • Developed a DGNSS infrastructure utilizing a Client/Server architecture.
  • Generated position corrections based on GNSS satellite IDs contributing to the smartphone's solution.
  • Implemented a method equivalent to direct range-domain correction.

Main Results:

  • Achieved horizontal positioning accuracy better than 2 meters in open areas across field tests.
  • Demonstrated over 50% accuracy improvement in some afternoon tests.
  • Validated the infrastructure's effectiveness without necessitating hardware modifications.

Conclusions:

  • The proposed DGNSS infrastructure significantly enhances smartphone positioning accuracy.
  • The system is scalable and efficient for mass DGNSS positioning requests.
  • This advancement supports smart city applications demanding higher location precision.