Abstract
The core performance elements of global navigation satellite system include availability, continuity, integrity and accuracy, all of which are particularly important for the developing BeiDou global navigation satellite system (BDS-3). This paper describes the basic performance of BDS-3 and suggests some methods to improve the positioning, navigation and timing (PNT) service. The precision of the BDS-3 post-processing orbit can reach centimeter level, the average satellite clock offset uncertainty of 18 medium circular orbit satellites is 1.55 ns and the average signal-in-space ranging error is approximately 0.474 m. The future possible improvements for the BeiDou navigation system are also discussed. It is suggested to increase the orbital inclination of the inclined geostationary orbit (IGSO) satellites to improve the PNT service in the Arctic region. The IGSO satellite can perform part of the geostationary orbit (GEO) satellite’s functions to solve the southern occlusion problem of the GEO satellite service in the northern hemisphere (namely the “south wall effect”). The space-borne inertial navigation system could be used to realize continuous orbit determination during satellite maneuver. In addition, high-accuracy space-borne hydrogen clock or cesium clock can be used to maintain the time system in the autonomous navigation mode, and stability of spatial datum. Furthermore, the ionospheric delay correction model of BDS-3 for all signals should be unified to avoid user confusion and improve positioning accuracy. Finally, to overcome the vulnerability of satellite navigation system, the comprehensive and resilient PNT infrastructures are proposed for the future seamless PNT services.
Highlights
The BeiDou navigation satellite system (BDS) provides more services compared with other global navigation satellite systems (GNSSs)
The inclination of medium circular orbit (MEO) and inclined geostationary orbit (IGSO) satellites is 55°, which indicates that the service performance of BDS-3 will be significantly degraded in high latitude area
If the inclination angle of IGSO satellites are increased and an appropriate ground reference station is built in the Arctic region, the BDSPPP and regional short message communication (RSMC) services can be provided to users in the Arctic region
Summary
The BeiDou navigation satellite system (BDS) provides more services compared with other global navigation satellite systems (GNSSs). The space– time datum, signal-in-space quality, accuracy of satellite broadcast ephemeris, the accuracy of the post-processing precise orbit, time synchronization accuracy, satellite clock offset accuracy and the basic PNT service Performance evaluation methods The spatial signal accuracies of BDS-3 include broadcast orbit accuracy, broadcast clock offset accuracy, signal-inspace ranging error (SISRE), broadcast ionospheric delay model accuracy, etc.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
