Orbit Residual Analysis of BDS Satellite Based on Ranging Information and Telemetry Parameters

摘要

Navigation satellites provide navigation, positioning, and timing services to users by broadcasting navigation ephemeris. The ground operation control system establishes a space reference to maintain the system, performs precise satellite orbit determinations, and completes satellite broadcast ephemeris forecasting. As of now, BDS-2 regional system has provided service for more than seven years. During the long-term on-orbit operation, the system provided stable navigation services in the Asia-Pacific region. It is inevitable that a single satellite is in orbit failure. With the continuous improvement of ranging accuracy, orbit determination, and broadcast ephemeris and breakthroughs in key technologies, it provides a certain empirical basis for the treatment of abnormal in-orbit problems. Taking the C06 satellite of the BDS-2 system as an example, this article detailed the process of the C06 satellite's two orbital URE divergences in April and September 2018. Based on the results, the possible causes were analyzed from the two aspects of ranging data and in-orbit telemetry parameters. This provides a certain reference method for similar orbit residual mutations and cause analysis.