Communication satellite system, earth-side control facility, ground facility, artificial satellite, communication ground center, and transmission route search device

A communication satellite system comprising:

• a plurality of artificial satellites that fly in inclined circular orbits of six or more orbital planes, respectively, the orbital planes having a common orbital inclination and having azimuth components of normal vectors of the orbital planes offset from each other in east-west direction, wherein
• the plurality of artificial satellites include eight or more artificial satellites on each of the orbital planes,
• each of the artificial satellites on each of the orbital planes includes a fore-aft communication device which is communication devices oriented forward in a flying direction on the orbital plane and rearward in the flying direction,
• each of the artificial satellites on each of the orbital planes forms a first communication network covering an entire circumference of the inclined circular orbit by forming cross-link communication with an artificial satellite flying in front in the flying direction and an artificial satellite flying behind in the flying direction via the fore-aft communication device, and
• each of the artificial satellites on each of the orbital planes
• passes over each of a northern edge of the inclined circular orbit and a southern edge of the inclined circular orbit in synchronization with artificial satellites on other orbital planes,
• forms a second communication network by forming, when passing over the northern edge of the inclined circular orbit, cross-link communication with artificial satellites passing over the northern edges of the inclined circular orbits that are contained in adjacent orbital planes via the fore-aft communication device, the adjacent orbital planes being orbital planes neighboring said orbital plane that contains said inclined circular orbit, and
• forms a third communication network by forming, when passing over the southern edge of the inclined circular orbit, cross-link communication with artificial satellites passing over the southern edges of the inclined circular orbits that are contained in the adjacent orbital planes via the fore-aft communication device.