A Hybrid Navigation Constellation Inter-satellite Link Assignment Algorithm for the Integrated Optimization of the Inter-satellite Observing and Communication Performance

摘要

The optimization of the inter-satellite link assignment is an important technical issue, especially, for the case that the number of inter-satellite spot-beam antennas is less than assignable links. Based on Minimum Spanning Tree (MST) theory in graph theory, this paper proposes a link assignment algorithm for the hybrid navigation constellation using GEO, IGSO and MEO satellites. Using GEO satellites as the core transfer node, this algorithm assigns inter-satellite links with lower communication costs firstly, and then assigns links at least once for all visible satellites by applying the iterative assignment. As a consequence, the integrated optimization of the inter-satellite observing and communication performance can be achieved. The simulated results show that, compared to the mesh-link assignment algorithm used for the Iridium system, the proposed link assignment algorithm can be able to improve the precision of orbit determination and reduce whole-network average communication delay.