Patent ID: 6328264
Filing Date: 2001-12-11
Classification: B64G,H04B

Abstract:
A communication system, whereinplural individual elliptical orbits in which an apogee is located on a specified service area are so defined that an individual right ascension of a north-bound node is established with a designated angle;an artificial satellite is made to travel on a respective ones of said plural individual elliptical orbit; anda group of artificial satellites arranged on respective ones of said plural individual elliptical orbits are used so that at least one of the artificial satellites having a communication system is always viewable within a pre-defined range of operational elevational angle in a zenith direction from said service area, and that said group of artificial satellites are on respective orbits obtained by combining an inclination angle and an eccentricity squared of said individual elliptical orbit so that a right ascension of north-bound node is a designated angle and that a time period during which an respective ones of said group of artificial satellites is viewable from ground is substantially identical.