Featured Technologies and Progress of BDS Spatiotemporal Parameter Services

The BeiDou Global Navigation Satellite System (BDS-3) started providing fully operational global services on July 31, 2020. It provides global positioning, navigation and timing (PNT) services and serves as key infrastructure for the determination and maintenance of the spatiotemporal reference frame in China. Challenges in the production of the spatiotemporal parameters of BDS exist due to its unique hybrid satellite constellation and regional-tracking-only capability. Innovative approaches are applied in the BDS ground control segment to ensure its high accuracy, high availability and high reliability. This paper introduces parts of these innovative approaches and discusses some key concepts of the ongoing comprehensive PNT system, which is regarded as the next-generation of BDS.