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A Modified Single-Frequency PPP Method for the Positioning and Time Transfer with BDS-3.

Mingjun Ouyang1, Xiangwei Zhu1, Junzhi Li1

  • 1School of Electronics and Communication Engineering, Sun Yat-Sen University, Guangzhou 510006, China.

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Summary

This study enhances BeiDou Navigation Satellite System (BDS) positioning accuracy using single-frequency precise point positioning (PPP). The modified GRAPHIC technique achieves decimeter-level accuracy, improving results significantly compared to general methods.

Keywords:
BDS-3group and phase ionospheric correction (GRAPHIC)precise point positioningsingle frequencytime transfer

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Area of Science:

  • Satellite Navigation Systems
  • Geodesy
  • Signal Processing

Background:

  • The BeiDou Navigation Satellite System (BDS) is a global navigation satellite system.
  • Accurate positioning is crucial for various applications.
  • Single-frequency precise point positioning (PPP) methods face challenges in achieving high accuracy.

Purpose of the Study:

  • To evaluate the performance of single-frequency PPP using BDS signals.
  • To validate a modified group and phase ionospheric correction (GRAPHIC) technique.
  • To assess the improvement in positioning accuracy with multiple BDS signals.

Main Methods:

  • Conducted time-frequency transfer and positioning experiments using BDS-3 (B1I, B1C, B2a, B3I) and BDS-2 (B2I) signals.
  • Employed the single-frequency precise point positioning (PPP) method.
  • Validated a modified group and phase ionospheric correction (GRAPHIC) technique.

Main Results:

  • Achieved decimeter-level positioning accuracy with 18 selected stations using single-frequency PPP.
  • Demonstrated significant improvements in positioning accuracy across five frequencies compared to the general observation approach (ranging from 10.3% to 80.3%).
  • Showcased frequency stability comparable to dual-frequency systems with BDS.

Conclusions:

  • The modified GRAPHIC technique effectively enhances single-frequency PPP accuracy for BDS.
  • Multi-frequency observations with BDS significantly improve positioning precision.
  • BDS single-frequency PPP shows promising results for high-accuracy positioning applications.