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Performance Analysis of Several GPS/Galileo Precise Point Positioning Models.

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  • 1Department of Civil Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada. akram.afifi@ryerson.ca.

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Precise Point Positioning (PPP) models using GPS/Galileo data show improved convergence and precision. The between-satellite single-difference (BSSD) model offers significant enhancements in both aspects compared to traditional methods.

Keywords:
BSSDGPSGalileoPPPambiguitydecoupled clock

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Area of Science:

  • Geodesy and Satellite Navigation
  • Global Navigation Satellite Systems (GNSS)

Background:

  • Precise Point Positioning (PPP) is crucial for accurate positioning.
  • Integrating dual-frequency GPS and Galileo observations enhances PPP performance.
  • Various PPP models exist, including un-differenced and between-satellite single-difference (BSSD) modes.

Purpose of the Study:

  • To evaluate the performance of different GPS/Galileo PPP models.
  • To compare convergence time and solution precision across various models.
  • To assess the impact of using IGS-MGEX network products.

Main Methods:

  • Utilized dual-frequency GPS/Galileo observations in un-differenced and BSSD modes.
  • Employed IGS-MGEX network products for satellite differential code biases and clock/orbital error corrections.
  • Modified Natural Resources Canada's GPSPace PPP software to accommodate different models.
  • Processed six datasets from six IGS stations.

Main Results:

  • Traditional un-differenced, decoupled clock, and semi-decoupled clock GPS/Galileo PPP models improved convergence by ~25% over GPS-only.
  • Semi-decoupled GPS/Galileo PPP enhanced solution precision by ~25% compared to the traditional un-differenced model.
  • BSSD GPS/Galileo PPP models improved convergence by ~50% and precision by 50% (loose) or 25% (tight) versus un-differenced GPS-only.

Conclusions:

  • GPS/Galileo PPP models, particularly BSSD, offer substantial improvements in convergence and precision.
  • The choice of PPP model significantly impacts positioning accuracy and efficiency.
  • Integration of multi-GNSS data and advanced models is key for future high-accuracy positioning.