In this paper, for Multi-Spacecraft System (MSS) with a directed communication topology link and a static virtual leader, a controller is proposed to realize attitude consensus and attitude stabilization with stochastic links failure and actuator saturation. First, an MSS attitude error model suitable for a directed topology link and with a static virtual leader based on SO(3) is derived, which considers that the attitude error on SO(3) cannot be defined based on algebraic subtraction. Then, we design a controller to realize the MSS on SO(3) with attitude consensus and attitude stabilization under stochastic links failure and actuator saturation. Finally, the simulation results of a multi-spacecraft system with stochastic links failure and a static virtual leader spacecraft are demonstrated to illustrate the efficiency of the attitude controller.

Aiming at the research of large-scale satellite constellation, the research content of communication resources is put forward. With the successful construction of several low-orbit constellations, the commercialization of large-scale satellite constellations has begun. This kind of large-scale satellite constellation can simultaneously take into account the advantages of low delay, wide coverage and large traffic. In order to make efficient use of earth station resources, it has become the technical bottleneck of large-scale satellite constellation research. The multi-star and multi-station topology is proposed to better focus on this problem. Combined with the link time resources, a satellite-earth link time model is proposed. On this basis, the time-slot insertion strategy is proposed, and the multi-star and multi-station link schedules are obtained by taking the overall link efficiency of multi-ground stations as the optimization objective. The feasibility and superiority of the proposed strategy are verified by comparing the performance with random strategy and greedy strategy.

Recently, Non-Terrestrial Satellite Networks (NTSTs) have gained more and more attentions due to global coverage, low latency, and high-speed communications. The routing scheme is one of the primary challenges for NTSNs, due to the mega scale of an NTSN constellation and the dynamic topology feature. To solve many pressing problems, a Compass time-space Model-based Virtual IP (CMVIP) routing scheme is proposed in this paper. In order to compensate for discontinuities in existing topology models, a compass-shaped time-space model is proposed. It can be adapted with Inter-Satellite-Link (ISL) and Ground-Satellite-Link (GSL) transmissions. A distributed algorithm with multiple optimization objectives and multiple constraints is applied for routing path discovery. To more realistically verify the specific scheme, a traffic model that supports two different services is proposed. Access and bearer services are the two main applications of an NTSN. Experimental results demonstrate that the proposed scheme achieves superior Quality-of-Service (QoS) performance. In addition, comparison results demonstrate that the CMVIP routing scheme is superior to the Virtual-Topology-based Shortest Path (VT-SP) routing algorithm.