Topological design and routing for low-Earth orbit satellite networks

Multi-source data integration and multi-scale modeling framework for progressive prediction of complex geological interfaces in tunneling

“…Some constellations [8], [2], [9], [4] have implemented inter-satellite link (ISL) for inter-satellite information transfer, at which point the system can be abstracted as a network system, in which the design of space network structure must take into account the motion and traffic characteristics between satellite nodes in the system. Satellite link establishment does not necessarily follow the principle of closest proximity, and some researchers have studied the constellation topology design, also called Link Assignment, which abstracts the FSA with a finite state machine and uses an optimization method to dynamically adjust the link establishment between satellites according to the load situation [10], [11], and the link can be established by satellites within any satellite visual range (LoS). Bhattacherjee [12] ignored the nearest neighbor principle and proposed a topology design method for the giant constellation network and abstracted it as an integer linear programming problem, using moduli units to reduce the problem complexity for optimization.…”

Topology construction technology of LEO satellite based on multi-objective optimization algorithm

“…Due to the rapid movement speed of LEO satellites, the connection topology of satellites varies greatly in different time slots, as shown in Figure 2.1. This paper models the satellite network learning from the ideas of the FSA [11] . Because of the periodicity of the motion of LEO constellations, a cicle of topology change is set as T. During period T, there is a topology changing period and a topology retention period in which the satellite topology remains unchanged, abstracting the time-continuous LEO satellite network into C time slots, in which the distance adjacency matrix between satellites remains unchanged, as shown in Figure 2.2.…”

“…Constraint (2-9) denotes the pitch angle range visible to two satellites blocked by the earth. Constraint(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) indicates the maximum number of links that any node can connect, that is, the maximum degree of nodes. Constraint (2-12) denotes the maximum effective distance of laser communication between two adjacent satellites.…”

Fast-Convergence Reinforcement Learning for Routing in LEO Satellite Networks

“…There are two satellite-to-satellite links within the satellite network. The link with an orbiting satellite is an intra-satellite link, and the link between adjacent orbiting satellites is an inter-satellite link [18]. So each satellite has up to four neighbor nodes to communicate with, leaving little decision space for the satellite when considering packet forwarding.…”