Admin tsn : Page créée avec « NOTOC == Introduction == === Scope === The "Orbital parameters" package contains classes to represent the orbital state of a space object. Several types of parameters are available (cartesian, keplerian, equinoctial... with different position angle definitions : true, mean, eccentric). Orbital parameters do not define a date nor a frame. To fully define an orbit, including date and frame, please refer to [FDY_Orbits_Home Orbits]. === Javadoc === The classe... »

2025-11-26T13:49:56Z

Page créée avec « __NOTOC__ == Introduction == === Scope === The "Orbital parameters" package contains classes to represent the orbital state of a space object. Several types of parameters are available (cartesian, keplerian, equinoctial... with different position angle definitions : true, mean, eccentric). Orbital parameters do not define a date nor a frame. To fully define an orbit, including date and frame, please refer to [FDY_Orbits_Home Orbits]. === Javadoc === The classe... »

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__NOTOC__
== Introduction ==

=== Scope ===
The "Orbital parameters" package contains classes to represent the orbital state of a space object. Several types of parameters are available (cartesian, keplerian, equinoctial... with different position angle definitions : true, mean, eccentric).
Orbital parameters do not define a date nor a frame. To fully define an orbit, including date and frame, please refer to [FDY_Orbits_Home Orbits].

=== Javadoc ===
The classes for orbital parameters description are available in the package <code>fr.cnes.sirius.patrius.orbits.orbitalparameters</code>.

{| class="wikitable"
|-
! scope="col"| Library
! scope="col"| Javadoc
|-
| Patrius
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/package-summary.html Package fr.cnes.sirius.patrius.orbits.orbitalparameters]
|}

=== Links ===
None as of now.

=== Useful Documents ===
None as of now.

=== Package Overview ===
All different orbital parameters types extend the abstract class AbstractOrbitalParameters and implement the interface IOrbitalParameters (the following class package may not contain all classes extending AbstractOrbitalParameters class).

[[File:orbitalparameters.png|center]]

All conversions methods from one type to another are specifically handled by each type of orbital parameters, thus optimising conversions.

== Features Description ==
=== Available parameters ===
The available parameters types are :
* Cartesian : X, Y, Z, Vx, Vy, Vz
* Keplerian : a, e, i, perigee argument, right ascension of ascending node, anomaly (in each position angle types)
* Equinoctial : a, ex, ey (eccentricity vector), hx, hy (inclination vector), longitude argument (in each position angle types)
* Alternate equinoctial : n (mean motion), ex, ey (eccentricity vector), hx, hy (inclination vector), longitude argument (in each position angle types but stored in mean)
* Stela Equinoctial : a, ex, ey (eccentricity vector), ix, iy (inclination vector), mean longitude argument
* Circular : a, ex, ey (eccentricity vector), i, right ascension of ascending node, latitude argument (in each position angle types)
* Apsis (using radius) : periapsis, apoapsis, i, perigee argument, right ascension of ascending node, anomaly (in each position angle types)
* Apsis (using altitude) : altitude of periapsis, altitude of apoapsis, i, perigee argument, right ascension of ascending node, anomaly (in each position angle types)
* Equatorial : a, e, longitude of the periapsis (ω + Ω), ix (first component of inclination vector), iy (second component of inclination vector), anomaly (in each position angle types)
* Reentry : altitude, latitude, longitude, velocity norm, slope of velocity, azimuth of velocity

== Getting Started ==
Any orbital parameters can be defined using the chosen constructor. Here is an example using circular parameters and true anomaly:

<syntaxhighlight lang="java">
final CircularParameters circularParameters = new CircularParameters(10000E3, 0.1, 0.2, 0.3, 0.4, 0.5, PositionAngle.TRUE, Constants.EGM96_EARTH_MU);
</syntaxhighlight>

Then conversions to any orbital parameters type can directly be obtained using the conversion routines. Here is an example of conversion to equinoctial parameters:

<syntaxhighlight lang="java">
final EquinoctialParameters equinoctialParameters = circularParameters .getEquinoctialParameters();
</syntaxhighlight>

== Contents ==

=== Interfaces ===
None as of now.

=== Classes ===
{| class="wikitable"
|-
! scope="col"| Class
! scope="col"| Summary
! scope="col"| Javadoc
|-
|'''CartesianParameters'''
|Cartesian parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/CartesianParameters.html ...]
|-
|'''KeplerianParameters'''
|Keplerian parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/KeplerianParameters.html ...]
|-
|'''CircularParameters'''
|Circular parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/CircularParameters.html ...]
|-
|'''EquinoctialParameters'''
|Equinoctial parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/EquinoctialParameters.html ...]
|-
|'''AlternateEquinoctialParameters'''
|Alternate Equinoctial parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/AlternateEquinoctialParameters.html ...]
|-
|'''StelaEquinoctialParameters'''
|Stela equinoctial parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/StelaEquinoctialParameters.html ...]
|-
|'''EquatorialParameters'''
|Equatorial parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/EquatorialParameters.html ...]
|-
|'''ApsisRadiusParameters'''
|Apsis parameters object (using radius).
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/ApsisRadiusParameters.html ...]
|-
|'''ApsisAltitudeParameters'''
|Apsis parameters object (using altitude).
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/ApsisAltitudeParameters.html ...]
|-
|'''ReentryParameters'''
|Reentry parameters object.
|[{{JavaDoc4.17}}/fr/cnes/sirius/patrius/orbits/orbitalparameters/ReentryParameters.html ...]
|}

[[Category:User_Manual_4.17_Flight_Dynamics]]

User Manual 4.17 Orbital parameters - Historique des versions