Performance assessment of BeiDou-3 PPP-B2b real time pre-cise point positioning

Area of Science:

• Geodesy and Geomatics
• Satellite Navigation Systems
• Signal Processing

Background:

• Existing precise point positioning (PPP) studies often neglect real-world interferences like signal occlusions and delays.
• This oversight limits the accurate assessment of real-time PPP service performance.
• The PPP-B2b service offers precise satellite orbit and clock offset data crucial for advanced positioning.

Purpose of the Study:

• To evaluate the real-time static and kinematic precise point positioning (PPP) performance using the PPP-B2b service.
• To assess the impact of using BeiDou Navigation Satellite System (BDS-3) alone versus a combination of BDS-3 and Global Positioning System (GPS).
• To analyze convergence times and positioning accuracy under various conditions.

Main Methods:

• Real-time static and kinematic PPP solutions were computed using BDS-3 and BDS-3/GPS data.
• The performance was evaluated based on signal matching, convergence speed, and positioning accuracy.
• Interferences like occlusions and delays were considered in the assessment framework.

Main Results:

• Both BDS-3 and GPS demonstrated strong signal matching with PPP-B2b, leading to rapid convergence in static PPP.
• BDS-3/GPS integration reduced static PPP convergence time by approximately 30% compared to BDS-3 alone.
• Real-time kinematic PPP achieved decimeter-level accuracy (4 cm horizontal, 8 cm vertical post-convergence) with a longer convergence time of ~1.5 hours.

Conclusions:

• The PPP-B2b service, when combined with BDS-3 and GPS, significantly enhances real-time static PPP performance.
• Decimeter-level accuracy is achievable in real-time kinematic PPP, though convergence is slower due to clock biases.
• The study highlights the importance of considering real-world signal conditions for accurate PPP performance assessment.