Satellite, satellite control method and satellite communication system
First Claim
1. An artificial satellite traveling on an elliptical orbit, in which said elliptical orbit is defined by six orbit-related parameters obtained with input conditions including the geographical condition of the service area to be covered by the artificial satellite, a minimum operational elevational angle within which the artificial satellite can be viewed from the service area, and a reference time for defining the orbit parameters.
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Abstract
In order to establish the communication lines among the movable bodies and/or fixed stations and to configure communication system with a small number of satellites, present method has the steps of determining six orbit-related parameters by using a input conditions including a geographical condition of the service area, a desired service time and the tolerance of an ascending vertical angle within which the satellite can be viewed from the service area, and establishing the satellite communication with one or more satellites, an individual satellite being arranged on the orbits selected and combined among plural elliptical orbits corresponding to the determined six orbit-related parameters on which the satellites stay for a sufficiently long time that they may come successfully into sight in the zenith direction.
35 Citations
36 Claims
- 1. An artificial satellite traveling on an elliptical orbit, in which said elliptical orbit is defined by six orbit-related parameters obtained with input conditions including the geographical condition of the service area to be covered by the artificial satellite, a minimum operational elevational angle within which the artificial satellite can be viewed from the service area, and a reference time for defining the orbit parameters.
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3. A group of artificial satellites traveling on an elliptical orbit, wherein six orbit-related parameters of the elliptical orbits of the individual artificial satellites are obtained with input conditions including a geographical condition of the service area to be covered by the artificial satellites, a minimum operational elevational angle within which any one of the group of artificial satellites can be viewed from the service area, and a reference time for defining the orbit parameters, and
wherein one or more artificial satellites are arranged on individual orbital planes within a predetermined range of the minimum operational elevational angle viewed in the zenith direction from the service area by combining plural elliptical orbits so that at least one or more artificial satellites can always come in sight.
- 8. A method of determining six orbit-related parameters of an artificial satellite traveling on an elliptical orbit, wherein said six orbit-related parameters of the elliptical orbit of the artificial satellite are obtained with input conditions including a geographical condition of a service area to be covered by the artificial satellites, a minimum operational elevational angle within which any one of the group of artificial satellites can be viewed from the service area, and a reference time defining orbit parameter.
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10. A method of arranging a plurality of artificial satellites traveling on elliptical orbits,
wherein six orbit-related parameteres of the elliptical orbits of the individual artificial satellites are obtained with input conditions including a geographical condition of a service area to be covered by the artificial satellites, a minimum operational elevational angle within which any one of the group of artificial satellites can be viewed from the service area, and a reference time defining the orbit parameters, and wherein in the case where plural artificial satellites are arranged, one of more artificial satellites may be arranged on individual orbital planes within a predetermined range of the minimum operational elevational angle as viewed in the zenith direction from the service area by combining plural elliptical orbits so that at least one or more artificial satellites can always come in sight.
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11. A method of determining six orbit-related parameters of artificial parameters, comprising the steps of:
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setting a polygon including a semi-major axis, a perigee argument, a semi-vertical angle, a service time and a service area, setting a number of satellites and a right ascension of a north-bound node and true anomaly of the individual satellites, setting an initial value for an orbital inclination angle, calculating a duration time for a satellite coming into sight from each apex of the polygon, setting a combination of orbital inclination angle and eccentricity squared, and resetting the right ascension of a north-bound node and true anomaly of the individual satellite.
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Specification