Ultrahigh altitude sun-synchronous orbit satellite system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64G-001/10
B64G-001/00
출원번호
UP-0630087
(2004-06-22)
등록번호
US-7806369
(2010-10-26)
국제출원번호
PCT/JP2004/008742
(2004-06-22)
§371/§102 date
20061220
(20061220)
국제공개번호
WO05/123507
(2005-12-29)
발명자
/ 주소
Kawaguchi, Junichiro
출원인 / 주소
Japan Aerospace Exploration Agency
대리인 / 주소
Westerman, Hattori, Daniels & Adrian, LLP
인용정보
피인용 횟수 :
3인용 특허 :
2
초록▼
An ultrahigh altitude sun-synchronous orbit satellite system having one or plural satellites orbiting the sun such that the satellites revolve around the earth in a substantially circular or elliptic motion at an altitude of several million kilometers from the earth, beyond the sphere of earth gravi
An ultrahigh altitude sun-synchronous orbit satellite system having one or plural satellites orbiting the sun such that the satellites revolve around the earth in a substantially circular or elliptic motion at an altitude of several million kilometers from the earth, beyond the sphere of earth gravity influence. The satellites are placed on an orbital plane relative to both the sun and the earth and keep a distance and geometry between the satellites, sun and earth substantially constant. The satellite system performs any one of the services of space observation, global observation, and satellite communication. The satellites orbit the sun with both inclination and eccentricity distinct from those of the revolution of the earth and revolve around the earth with a sun synchronous property in which the local solar time is kept constant at a point on the surface of the earth directly beneath the satellite.
대표청구항▼
The invention claimed is: 1. An ultrahigh altitude sun-synchronous orbit satellite system, comprising: one or plural satellites orbiting the sun such that the one or plural satellites revolve around the earth in a substantially circular or elliptic motion at an altitude of several million kilometer
The invention claimed is: 1. An ultrahigh altitude sun-synchronous orbit satellite system, comprising: one or plural satellites orbiting the sun such that the one or plural satellites revolve around the earth in a substantially circular or elliptic motion at an altitude of several million kilometers from the earth, said altitude of several million kilometers being beyond the sphere of earth gravity influence, said one or plural satellites being placed on an orbital plane relative to both the sun and the earth and keeping the distance and geometry between the one or plural satellites and the sun and between the one or plural satellites and the earth substantially constant, the satellite system performing any one of the services of space observation, global observation, and satellite communication, wherein the one or plural satellites orbit the sun with both inclination and eccentricity distinct from those of the earth revolution and revolve around the earth with a sun synchronous property in which the local solar time is kept constant at a point on the surface of the earth directly beneath the satellite. 2. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1, wherein each of the one or plural satellites is a sun-synchronous orbit satellite having a rotation period of approximately one year. 3. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1 or 2, wherein each of the one or plural satellites is a sun-synchronous orbit satellite which makes an orbital revolution motion around the sun governed by the sun's gravity, but revolves around the earth at a distance of at least several millions of kilometers keeping clear of the gravitational influence zone of the earth. 4. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1 or 2, wherein a vector, which is perpendicular to the orbital plane of each of the one or plural satellites, is substantially fixed relative to revolution around the sun, and substantially the entire celestial sphere is scanned and swept during a single revolution about the sun, while avoiding the effects of light and heat from the earth, whereby the space observation is performed. 5. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1 or 2, wherein the local solar time at a sub-satellite point on the surface of the earth is constantly maintained as the same local solar time when each of the one or plural satellites flies over said sub-satellite point, said sub-satellite point being a point on the surface of the earth directly below the satellite where a line connecting the satellite and the center of the earth intersects the surface of the earth. 6. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1 or 2, wherein in the satellite communication, substantially a hemisphere of the earth coverage can be realized at a time simultaneously with one of the one or plural satellites, and substantially the entire region of the earth coverage can be achieved by disposing a small number or three of the one or plural satellites in the said satellite system at equal intervals. 7. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1 or 2, wherein by using perturbation of the attraction of the earth gravity in each of the one or plural satellites, the geometrical relation in terms of a direction and a distance among sun, earth, and the one or plural satellites, in the said satellite system, is kept constant season to season during the revolution about the sun in such a way that said one or plural satellites in said ultrahigh altitude sun-synchronous orbit passes over the meridian line of any given point on the surface of the earth at the same local solar time while substantially maintaining the geometrical relation for a wide range of ratio between an orbit inclination angle and eccentricity. 8. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1 or 2, Wherein the ratio between the orbit inclination angle and eccentricity in each of the one or plural satellites is set to 1.73, and a geometrical relation in terms of a direction and a distance among sun, earth, and the one or plural satellites, in the said satellite system, is kept constant season to season during the revolution about the sun in such a way that said one or plural satellites in said ultrahigh altitude sun-synchronous orbit passes over the meridian line of any given point on the surface of the earth at the same local solar time while substantially maintaining the constant distance from the earth to the said one or plural satellites. 9. The ultrahigh altitude sun-synchronous orbit satellite system according to claim 1, wherein each of the one or plural satellites is placed into orbit by means of a sequence using the perturbation of the attraction of the earth gravity, significantly reducing an orbit correction velocity amount.
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이 특허에 인용된 특허 (2)
John E. Draim, Constellation of elliptical orbit satellites with line of apsides lying in or near the equatorial plane.
Hope, Alan Scott; Lum, Annie Megan, Method and system for establishment and maintenance of a global formation of directionally-fixed spacecraft without the use of expendable mass.
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