Featured services and performance of BDS-3

Area of Science:

• Satellite Navigation Systems
• Geodesy
• Signal Processing

Background:

• The BeiDou-3 Navigation Satellite System (BDS-3) provides standard Positioning, Navigation, and Timing (PNT) functions.
• BDS-3 also offers specialized satellite-based services categorized into geostationary orbit (GEO) and medium earth orbit (MEO) services.

Purpose of the Study:

• To describe the featured services offered by BDS-3, including regional and global capabilities.
• To evaluate the performance and accuracy of these specialized BDS-3 services.

Main Methods:

• Analysis of inter-satellite link (ISL) contributions to constellation accuracy.
• Performance evaluation of regional short message communication service (RSMCS), radio determination satellite service (RDSS), BDS satellite-based augmented service (BDSBAS), and satellite-based precise point positioning (B2b-PPP).
• Assessment of global short message communication service (GSMCS) and MEO-based search and rescue (MEOSAR) service performance.

Main Results:

• Inter-satellite links (ISLs) significantly improve orbit determination and time synchronization accuracy.
• BDS-3 precise orbits and broadcast clock achieve Root Mean Square (RMS) accuracies of 25.1 cm and 2.01 ns.
• Featured services demonstrate high success rates (e.g., RSMCS >99.9%, MEOSAR >99%) and precise positioning (e.g., B2b-PPP <0.6 m).

Conclusions:

• The integration of ISLs in the BDS-3 constellation substantially enhances the performance and capabilities of global featured services.
• BDS-3 provides robust and accurate PNT functions alongside a suite of advanced regional and global services.
• The system's performance metrics indicate high reliability and accuracy across all evaluated services.