PAKSAT TRAINING ORBIT
DYNAMICS
GengGeng ChangFuChangFu
Beijing,Beijing, MarMar 20092009
******@cfgeng@
CONTENTCONTENT
1 Introduction
2 Basis of orbit dynamics
Systems of coordinates
Two body mechanics
Definition of the orbit
Delta - V
Time measurements systems
Sun & Moon ephemeris
GEO definition
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CONTENTCONTENT
3 Orbit perturbation
General equation & perturbation source
General equations
Osculating elements
Gauss equations
Sources of orbit perturbations in GEO
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CONTENTCONTENT
Earth flattening effect
Earth equatorial bulge effect
Asymmetric flattening effect
Solar and lunar gravity attraction
Solar radiation pressure effect
Impact of perturbations on orbital elements
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CONTENTSCONTENTS (Cont(Cont’’d)d)
Earth potential triaxiality
Luni-solar perturbations
Luni-solar gravity attraction
Inclination vector
Gauss equations for inclination vector
Perturbative acceleration
Perturbation on inclination vector due to sun
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CONTENTSCONTENTS (Cont(Cont’’d)d)
Perturbation on inclination vector due to moon
Luni-solar resultant secular impact
Luni-solar resultant periodic impact
Inclination vector free evolution
Annual drift of inclination
Luni-solar perturbations on mean longi
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