BDS-3 RNSS technical characteristics and service performance

Abstract

A detailed description of BDS-3 including constellation design, different types of services, signal structure, coordinate and time frame, mechanics of orbit determination and time synchronous is provided. A RNSS service performance assessment parameters list is provided. It consists of parameters about time and coordinate frame, signal quality, signal in space accuracy and service performance. Tracking data is collected from stations globally distributed, and performance of BDS-3 initial service is assessed. From results, ratio bias of signal component effective power is less than 0.25 dB, S curve bias is less than 0.3 ns, position dilution of precision (PDOP) availability of current constellation is better than 85% at global level, signal-in-space ranging error is 0.48 m(RMS), signal-in-space availability reached 99.78%, signal-in-space continuity reached 99.99%, UTC offset error is 19.1 ns. All of them fulfill the design specification and requirements of BDS open service performance standard. Compared to BDS-2 satellites, current BDS-3 constellation realized global coverage and achieved a better performance in signal-in-space error, signal-in-space availability and signal-in-space continuity.