Astrodynamics 101 - DerAstrodynamics.com
Astrodynamics 101 - DerAstrodynamics.com
Astrodynamics 101 - DerAstrodynamics.com
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Osculating Orbital<br />
Elements at t o<br />
[ r (t ), v (t )]<br />
o o<br />
Radars /<br />
Optical<br />
sensors<br />
Future<br />
look angles<br />
( pointing<br />
prediction )<br />
Others . . . . . .<br />
Orbit Determination and Prediction/Propagation<br />
Object at t<br />
r<br />
Unsuitable for real-time<br />
automatic processing<br />
Ephemerides<br />
(Catalogs)<br />
Raw<br />
Observation<br />
data<br />
v<br />
Orbit<br />
Determination<br />
(Estimated future/past)<br />
position and velocity vectors<br />
Rise/Set<br />
Site visibility<br />
<strong>Astrodynamics</strong><br />
102: Lambert /<br />
103: Gauss/Laplace<br />
Initial Orbit<br />
Determination<br />
Processed<br />
Observation<br />
data<br />
Differential<br />
Correction<br />
Batch / KF<br />
TLE<br />
conversion<br />
difficulties<br />
Singularity<br />
difficulties<br />
Osc2Mean<br />
Analytic algorithms in OD and P/P<br />
need to process 100,000+ Objects<br />
in less than 12 hours with accuracy<br />
of 10 km to centimeters for SSA<br />
(Estimated initial)<br />
positin and<br />
velocity vectors<br />
Orbital<br />
element set<br />
r and v<br />
Prediction /<br />
Propagation<br />
1 2<br />
SP<br />
3<br />
Numerical<br />
SGP4<br />
Integration Kepler+<br />
Close approach<br />
(miss distance)<br />
Osculating Orbital<br />
Elements at t<br />
[ r , v ]<br />
Astro <strong>101</strong>:<br />
Kepler<br />
1<br />
2<br />
3<br />
SGP4 needs TLE<br />
conversion<br />
(not efficient for SSA)<br />
SP is accurate, but<br />
slow for SSA<br />
Kepler+ is accurate<br />
and fast for SSA
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