What are ground tracks?
What are ground tracks?
COE Determination
aei
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?
?
?
?
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COE Determination
Non-rotating Earth
Rotating Earth
COE Determination
Semimajor axis
Δ longitude
ΔN
P =ΔN
15º / hr
3a2P
aei
?
?
?
?
COE Determination
?
COE Determination
Eccentricity
Circle
COE Determination
Eccentricity
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
Line Symmetry
Ellipse
COE Determination
Eccentricity
COE Determination
Eccentricity
Hinge Symmetry
Ellipse
COE Determination
Hinge Symmetry
Eccentricity
Ellipse
COE Determination
Hinge Symmetry
Eccentricity
Ellipse
COE Determination
Hinge Symmetry
Eccentricity
Ellipse
COE Determination
Hinge Symmetry
Eccentricity
Ellipse
COE Determination
Eccentricity
Hinge Symmetry
Ellipse
COE Determination
Eccentricity
COE Determination
Eccentricity
Line & Hinge
Circle
COE Determination
Eccentricity
Neither
Ellipse
COE Determination
Eccentricity
aei
?
?
?
?
COE Determination
~
COE Determination
Inclination
i = highest latitude
COE Determination
Inclination
i = 180º - highest latitude
COE Determination
Inclination
i = highest latitude
COE Determination
Inclination
i = 180º - highest latitude
aei
?
?
?
COE Determination
~
aei
?
?
COE Determination
~
COE Determination
Argument of Perigee
COE Determination
360º per orbit90º
180º
270º
360º
Ascending Node
Argument of Perigee
Perigee = 180
Perigee = 270
Perigee = 90
Perigee = 0
Hinge Symmetric Line Symmetric
COE Determination
Argument of Perigee
ω = 180º
COE Determination
Argument of Perigee
ω = 90º
COE Determination
Argument of Perigee
ω = 0º
COE Determination
Argument of Perigee
ω = 270º
COE Determination
Argument of Perigee
Hinge Symmetry
ω = 0º or 180º
COE Determination
Argument of Perigee
Line Symmetry
ω = 90º or 270º
aei
?
COE Determination
~
~
Orbit Examples
Molniya
Geostationary
Geosynchronous
Geosynchronous
e = 0.8 = 180
e = 0.8 = 0
e = 0.0
Geosynchronous
e = 0i = 0
e = 0.4 = 180
e = 0.6 = 90
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