To provide a
monitoring system capable of performing constant global monitoring with a small number of satellites and high in monitoring performance such as spatial resolution and monitoring performance.SOLUTION: A
monitoring system 3000 comprises: a plurality of monitor satellites including a first monitoring device directed to an
earth surface and a second monitoring device directed to an earth circumference; and a ground facility. Six or more monitor satellites form a
satellite constellation of an
equator sky satellite group flying over the
equator with less than
orbit inclination of 10 degrees. The
monitoring system 3000 has an
elliptic orbit, expands a monitoring range of the second monitoring device to a
high latitude side near a remote point, and expands it to a
low latitude side near a near point. The monitoring
system 3000 can monitor, against a cosmic background, a tangential direction of a north
latitude of 20 degrees at an
orbit altitude of about 400 km, a tangential direction of a north
latitude of 30 degrees at an
orbit altitude of about 1,000 km, a tangential direction of a north
latitude of 40 degrees at an orbit altitude of about 2,000 km, a tangential direction of a north latitude of 50 degrees at an orbit altitude of about 3,600 km, and a tangential direction of a north latitude of 60 degrees at an orbit altitude of about 12,800 km.SELECTED DRAWING: Figure 44