Voir la source de Catégorie:User Manual 4.2 Orbit Propagation

== Introduction ==
[[File:copernicus.jpg|center]]

<center><blockquote>I shall now recall to mind that the motion of the<br>
heavenly bodies is circular, since the motion<br>
appropriate to a sphere is rotation in a circle.<br>
''Mikołaj Kopernik (1473 – 1543)''</blockquote></center>


This section is a short presentation of the orbital tools implemented in the PATRIUS Library. The orbital tools of the PATRIUS library cover the software requirements given in '''[A1]''' §13,17,18,20.

== Applicable and Reference Documents ==
=== Applicable Documents ===

'''[A1]'''      ''CDCF - Fonctions de Base du Patrimoine de Dynamique du Vol'', V1.2, SIRIUS-CF-DV-0049-CN, 2011.<br>
'''[A2]'''      ''Dossier de réutilisation Orekit et Commons Math'', V1.0, SIRIUS-DLR-DV-0080-CN, 2010.

=== Reference Documents ===

'''[R1]'''    ''Apache License'', Version 2.0, January 2004, [http://www.apache.org/licenses/LICENSE-2.0.txt].

== Glossary ==
{| class="wikitable"
|-
|'''EGM96'''
|Earth Gravitational Model 1996
|-
|'''EIGEN'''
|European Improved Gravity model of the Earth by New techniques
|-
|'''GRACE'''
|Gravity Recovery And Climate Experiment
|-
|'''GRGS'''
|Groupe de Recherche de Géodésie Spatiale
|-
|'''ICGEM'''
|International Centre for Global Earth Models
|}

== Overview ==
The following themes are discussed in this section:

; Physical models
: This chapter describes the force models available including but not limited to : central body attraction, third body attraction, atmospheric pressure, solar radiation pressure, new atmospheric models, terrestrial and ocean tides, other radiative pressure and interplanetary models. It also includes a description of the model describing the displacements of reference points due to the effect of the solid Earth tides.

; Propagation
: This chapter deals with the different propagators that are available to propagate the initial state of a spacecraft. Analytical propagators are implemented (Keplerian, Eckstein-Hechler, 2D, etc.) as well as numerical ones (that are better suited to perform more accurate propagations - it is the most important part of the Patrius library) and STELA semi-analytical propagator.

; Multi Propagation
: This chapter deals with the multi propagator that is available in PATRIUS to propagate several initial states. Numerical propagator is implemented.

; Ephemeris
: Integrated ephemeris, Ephemeris and Lagrange ephemeris.

; Measures and data filtering
: This chapter describes the basic concepts of localisation measures and orbit restitution, measure modelling and data filtering.


[[Catégorie:User Manual 4.2]]