Loading patent…
OwnerToshihide Maeda, Nobuo Hamano +6inventors
InventorsToshihide Maeda, Nobuo Hamano, Shigeki Nakamura, Tomiharu Yoshida, Masataka Owada, Masahiko Ikeda, Takashi Yabutani, Masahiro Ito
Estimating the term…
A communication line not affected by artificial structures and plants is established between mobile objects and stationary stations surrounded with skyscrapers, and economical artificial satellite service capable of efficiently performing satellite broadcast, mobile satellite communication, satellite-to-satellite communication and earth surveillance is provided using the communication line and by constructing the system with a small number of satellites. Six orbital elements 7-12 of a plurality of artificial satellites at reference time 5 are determined, and a plurality of elliptical orbits corresponding to the determined six orbital elements are combined, and then each of the satellites is appropriately arranged on each of the orbits to form a group of artificial satellites. Satellite communication or satellite broadcast is performed using the group of artificial satellites.
A communication system comprising a plurality of artificial satellites each having a communication unit traveling on elliptical orbits with an orbital period of 24 hours, each of the orbits is formed so that an orbital inclination angle is larger than 37 degrees and smaller than 44 degrees and an eccentricity is not larger than 0.24, or so that an orbital inclination angle is larger than 40 degrees and smaller than 44 degrees and an eccentricity is larger than 0.24 and smaller than 0.35.
A communication system comprising a group of artificial satellites each having a communication unit, wherein a plurality of elliptical orbits of which an apogee is located above a specified service target area are set so that an angle between right ascensions of north-bound node become a predetermined value, each of the satellites traveling on each of the elliptical orbits, the group of artificial satellites being arranged on said elliptical orbits so that at least one of the artificial satellite having the communication unit is always visible within a predetermined elevation angle with respect to a zenith direction from said service target area, wherein
A communication system comprising a plurality of artificial satellites each having a communication unit traveling on elliptical orbits, wherein arguments of perigee are set to values with a predetermined allowance in a setting process of said plurality of artificial satellites.
A communication system comprising a group of artificial satellites, wherein a plurality of elliptical orbits are set so that each apogee is located above a specified service target area and the orbits projected on the ground nearly agree with one another;
A communication system comprising a group of artificial satellites, wherein a service target area is an area set by latitudes and longitudes of four positions of a northernmost end, a southernmost end, a westernmost end and a easternmost end of said service target area, or a polygonal area including the whole service target area set by latitudes and longitudes other than those of said four positions when said service target area is not completely included in said quadrangle having apices of said four positions;
A communication system comprising a group of artificial satellites, wherein a service target, area is an area selected from the whole world within a range from latitude approximately 70 degrees north to latitude approximately 70 degrees south;
A communication system comprising a group of artificial satellites, wherein a service target area is an area selected from the whole world within a range from latitude approximately 85 degrees north to latitude approximately 85 degrees south;
A communication system comprising a group of artificial satellites each having a communication unit, wherein a plurality of elliptical orbits of which an apogee is located above a specified service target area are set so that an angle between right ascensions of north-bound node become a predetermined value, each of the satellites traveling on each of the elliptical orbits, the group of artificial satellites being arranged on said elliptical orbits so that at least one of the artificial satellite having the communication unit is always visible within a predetermined elevation angle with respect to a zenith direction from said service target area, wherein said group of artificial satellites are a plurality of artificial satellites of which arguments of perigee are set to values with a predetermined allowance in a setting process of said plurality of artificial satellites.
A communication system comprising a group of artificial satellites, wherein a service target area is an area set by latitudes and longitudes of four positions of a northernmost end, a southernmost end, a westernmost end and a easternmost end of said service target area, or a polygonal area including the whole service target area set by latitudes and longitudes other than those of said four positions when said service target area is not completely included in said quadrangle having apices of said four positions;
A communication system comprising a group of artificial satellites, wherein a service target area is an area selected from the whole world within a range from latitude approximately 70 degrees north to latitude approximately 70 degrees south;
A communication system comprising a group of artificial satellites, wherein a service target area is an area selected from the whole world within a range from latitude approximately 85 degrees north to latitude approximately 85 degrees south;
An orbit arranging method for artificial satellites, wherein a plurality of artificial satellites are arranged so that four elements of a semi-major axis, an eccentricity, an argument of perigee-and an orbital inclination angle of the artificial satellite traveling on an orbit are set to nearly equal values among the artificial satellites, and said value of argument of perigee is set with a predetermined allowance.
An orbit arranging method for artificial satellites, wherein a plurality of artificial satellites are arranged so that four elements of a semi-major axis, an eccentricity, an argument of perigee and an orbital inclination angle of the artificial satellite traveling on an orbit are set to nearly equal values among the artificial satellites and so as to be spaced a true anomaly of nearly 360 degrees/N (N is number of the satellites), and said value of argument of perigee is set with a predetermined allowance.
A communication system comprising a group of artificial satellites each having a communication system composed of three or four artificial satellites traveling on different three or four elliptical orbits, wherein
A tracking and controlling facility for tracking and controlling an artificial satellite, wherein an artificial satellite to be tracked and controlled is
Dependencies are inferred from the claim text.