Patent ID: 6422516
Filing Date: 2002-07-23
Classification: B64G,H04B

Abstract:
An orbit control system having an artificial satellite tracking and supervisory facility whichestimates orbits of a group of flying artificial satellites; obtains an orbit-controlled value and attitude-controlled value required by said estimated orbits and a pre-defined target controlled value; and establishes a control command corresponding to an individual controlled value and transmits said control command to said group of artificial satellites, wherein said artificial satellite is placed into an orbit in which an individual satellite orbits on an elliptical orbit so that at least one of the artificial satellites is always viewable within a pre-defined range of operational elevational angle in a zenith direction from a service area; and a group of said artificial satellites are satellites on respective different orbits obtained by combining an inclination angle and an eccentricity squared of said elliptical orbit so that a time period during which one artificial satellite of said group of said artificial satellites is viewable from ground is substantially identical to a time period during which another artificial satellite of said group of said artificial satellites is viewable from ground.