Method for managing intersatellite links in a low earth orbit satellite system

摘要

A method of managing inter-satellite links (ISLs) in a LEOS system. Intra-plane ISLs are established between a subject satellite and adjacent satellites in the same orbital plane. These intra-plane ISLs are generally fixed during all operations and will not be severed or reestablished once they have been initially established. Neighbor ISLs are established to minimize offset between a subject satellite and the neighboring satellites with which it has neighbor ISLs. However, satellites in the neighbor plane may be selected for neighbor ISLs which do no currently provide the minimal offset position but soon will based upon the continuing relative motion between the planes. Altering neighbor ISLs for an orbital plane is coordinated within a plane to eliminate loops and inefficient routing paths. Seam ISLs are also managed. When a satellite operates in a teardrop area (area in which the satellite provides some coverage), the satellite establishes seam ISLs to up to two seam satellites in a seam orbital plane. However, when the satellite moves into a mesh area, it may relinquish all seam ISLs. When such operation occurs, an ISL between the seam satellite previously having a link to the subject satellite may be established to a satellite in an adjacent plane.