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Real-time Precise Point Positioning with a Xiaomi MI 8 Android Smartphone.

Bo Chen1, Chengfa Gao2, Yongsheng Liu3

  • 1School of Transportation, Southeast University, Nanjing 211189, China. 220172986@seu.edu.cn.

Sensors (Basel, Switzerland)
|June 28, 2019
PubMed
Summary

This study explores precise point positioning (PPP) for smartphones without reference stations. A modified PPP method using multi-GNSS data on the Xiaomi MI 8 achieved average horizontal and vertical errors of 0.81m and 1.65m, respectively.

Keywords:
Android smartphoneGNSS raw observationsReal-time Precise Point PositioningXiaomi MI 8

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation
  • Mobile Sensing

Background:

  • Global Navigation Satellite System (GNSS) positioning is increasingly integrated into smartphones for widespread applications.
  • The Xiaomi MI 8, a dual-frequency GNSS smartphone, signifies advancements in mobile GNSS technology.
  • Accurate real-time smartphone positioning without external reference stations remains a challenge.

Purpose of the Study:

  • To investigate the optimal real-time Global Navigation Satellite System (GNSS) positioning performance achievable with smartphones.
  • To address the challenge of non-fixed differences between pseudorange and carrier phase observations in smartphone GNSS measurements.
  • To evaluate a modified precise point positioning (PPP) strategy for real-time smartphone applications.

Main Methods:

  • Analysis of raw GNSS measurements from multiple smartphones, including the Xiaomi MI 8.
  • Modification of the precise point positioning (PPP) algorithm to account for observed pseudorange and carrier phase discrepancies.
  • Implementation and testing of a real-time PPP strategy estimating dual clock biases on the Xiaomi MI 8.

Main Results:

  • Observed non-fixed differences between pseudorange and carrier phase observations across tested smartphones.
  • The modified real-time PPP strategy utilizing multi-GNSS (GPS, BDS, Galileo) data on the Xiaomi MI 8.
  • Achieved average Root Mean Square (RMS) positioning errors of 0.81 m (horizontal) and 1.65 m (vertical).
  • Real-time positioning errors in North and East directions fell below 1 m within 30 seconds.

Conclusions:

  • Multi-GNSS data significantly enhances smartphone positioning performance in real-time PPP.
  • The modified PPP method effectively mitigates issues with pseudorange and carrier phase observations.
  • Smartphone-based real-time PPP offers promising accuracy for mass-market applications.