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Position Accuracy Improvement by Implementing the DGNSS-CP Algorithm in Smartphones.

Donghwan Yoon1, Changdon Kee2, Jiwon Seo3

  • 1School of Aerospace Engineering, Sejong University, Seoul 05006, Korea. donghwan@sju.ac.kr.

Sensors (Basel, Switzerland)
|June 21, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a new software-based method to improve Global Navigation Satellite System (GNSS) accuracy in smartphones. The novel approach enhances positioning precision by 30%-60% without hardware changes.

Keywords:
androiddifferential GNSSglobal navigation satellite systemlocation-based systemsmartphone

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Area of Science:

  • Geomatics Engineering
  • Mobile Computing
  • Satellite Navigation Systems

Background:

  • Smartphone Global Navigation Satellite System (GNSS) accuracy is crucial for location-based services.
  • Traditional Differential GNSS (DGNSS) methods are incompatible with current smartphone architectures.
  • Existing GNSS positioning errors in smartphones range from 3-4 meters.

Purpose of the Study:

  • To develop and apply a novel DGNSS-correction projection method for commercial smartphones.
  • To enhance the position accuracy of multi-constellation GNSS (GPS, GLONASS, BeiDou) receivers.
  • To enable software-based GNSS error correction without hardware modification.

Main Methods:

  • Calculated local line-of-sight unit vectors from Android LocationManager data (elevation, azimuth).
  • Transformed vectors to Earth-centered, Earth-fixed coordinates.
  • Constructed a multi-constellation observation matrix using line-of-sight vectors for position-domain correction.

Main Results:

  • Improved standalone GNSS accuracy by 30%-60% in static and dynamic tests.
  • Reduced positioning errors from 3-4 meters to approximately 1 meter.
  • Demonstrated effective position error correction solely through software implementation.

Conclusions:

  • The proposed DGNSS-correction projection method significantly enhances smartphone GNSS accuracy.
  • The software-based approach offers a portable and cost-effective solution for improving location services.
  • This method eliminates the need for hardware or infrastructure alterations in smartphones.