Joint Optimization of Distance and Stability Link Assignment Strategy in Cislunar Space Networks

The cislunar space network is attracting increasing international attention due to the rapid advancements in launch technology and the growing demand for deep space exploration. This network promises to facilitate lunar exploration and ensure robust communication links between the Moon and Earth. In designing a reliable topology for dynamically changing networks, such as the cislunar space network, considerations must include distance, link stability, and antenna limitations. However, existing link assignment strategies primarily focus on Low Earth Orbit (LEO) satellite networks. This paper proposes a collaborative scheme for link assignment named the Joint Optimization of Distance and Stability (JODS) Link Assignment Strategy. This method utilizes static snapshots derived from network status data exported from the Satellite Tool Kit (STK) and divides the constellation period into unequal time slots to address the comprehensive demands of distance and stability. The cislunar space network is modeled as a graph, with links assigned using the JODS strategy. Simulation results indicate that JODS reduces link changes by 28.68%, decreases the average distance by 15.82%, and significantly increases the fully-connected time compared to the simulated annealing algorithm and the LDL algorithm.