Geostationary Satellites Collocation by Hengnian Li

By Hengnian Li

Geostationary Satellites Collocation goals to discover suggestions for deploying a secure and trustworthy collocation keep an eye on. concentrating on the orbital perturbation research, the mathematical foundations for orbit and keep an eye on of the geostationary satellite tv for pc. The mathematical and actual precept of orbital maneuver and collocation options for multi geostationary satellites sharing with an identical useless band is additionally under pressure. in addition, the booklet offers a few purposes utilizing the above algorithms and mathematical types to assist readers grasp the corrective technique for making plans station protecting maneuvers. Engineers and scientists within the fields of aerospace know-how and area technological know-how can make the most of this book.

Hengnian Li is the Deputy Director of country Key Laboratory of Astronautic Dynamics, China.

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Geostationary Satellites Collocation

Geostationary Satellites Collocation goals to discover suggestions for deploying a secure and trustworthy collocation keep an eye on. targeting the orbital perturbation research, the mathematical foundations for orbit and keep watch over of the geostationary satellite tv for pc. The mathematical and actual precept of orbital maneuver and collocation suggestions for multi geostationary satellites sharing with an identical useless band can be under pressure.

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For three-axis-stabilized satellite, the attitude is fixed and evaluated 36 2 Orbit Motion Foundations with the satellite-fixed East/South/Down reference frame. For planning station keeping maneuver of the geostationary satellite, the drift motion relative to the nominal point is depicted in the satellite-fixed orbit coordinate system. For portraying the propellant configuration of the satellite, the installation cosine vector is projected into the satellite body coordinate system, etc. 1 Background and General Definitions A reference system in space is mathematically represented by a reference frame (O, ε), where O is a point in space serving as the origin of the frame, and ε is an orthogonal basis.

23, in which the actual geostationary satellite motion near the nominal point can be projected in the nominal radial, tangential, and normal reference frames. 10 Satellite-Fixed Orbit Coordinate System The orbit coordinate system O À xoyozo, with which the attitude of satellite is described and stabilized, takes the center of satellite as the origin. 4 Reference System 53 Fig.

It is not possible to determine the Universal Time by a direct conversion from constant Atomic Time because the rotation of the Earth cannot be predicted accurately. Every change in the Earth’s rotation alters the length of a day, and must be taken into account in the Universal Time (UT). Therefore, the Universal Time is defined as a function of sidereal time, which directly reflects the rotation of the Earth, and it is also a continuous and nonuniform time system. 3 Julian Days and Modified Julian Days The Julian day is often confused with another time numbering system, the cardinal date of the year.

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