Research on Strategy of Access Node Selection for Space-Based Relay Network Based on Navigation Satellites

At present, all next generation GNSS navigation satellites have plan to equip with laser inter satellite links for high-precision ranging and high-speed data transmission. Compared with other space systems, navigation satellites have the advantages of excellent coverage performance and high-precision space-time reference. Combined with the abundant communication bandwidth of laser inter satellite links, they naturally have the potential to become the backbone network of space-based communication relay. According to the configuration characteristics of Beidou navigation satellite constellation, this paper proposes a scheme of access node selection for space-based relay network based on Beidou navigation satellite. Firstly, the delay of navigation satellite constellation network is analyzed theoretically, then two access node selection schemes are given, and the performance of the proposed scheme, such as access node coverage and queuing delay of the whole network, is simulated and analyzed, which provides a reference for the future design of space-based relay network based on navigation satellite.