Characteristics of crosslinks between satellites in large symmetric constellations

In large constellations of satellites it is often important to provide communication links between the satellites, These crosslinks require that there be a continuous unobstructed line of sight between the linked satellites. Furthermore, it is desired to select crosslink partners such that gimbal angles and rates on the crosslink antennas are kept within reasonable bounds. It may also be attractive to select crosslink partners so that all satellites in the constellation are connected in a single communication loop. This paper examines the availability and characteristics of crosslinks in large symmetric (Walker-type) constellations, Equations are developed which allow the determination of acceptable crosslink partners and describe the gimbal angle requirements to complete the link. In many cases, multiple crosslink paths are available and the characteristics of these are analyzed to enable the user to select the best option for his purposes.