Integrator : Différence entre versions

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(Numerical integrator)
 
(14 révisions intermédiaires par le même utilisateur non affichées)
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* Value of the duration or the date of the end of the propagation
 
* Value of the duration or the date of the end of the propagation
 
* Altitude of the end of the propagation
 
* Altitude of the end of the propagation
 +
* Type of altitude (since V11.4)
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 +
[[Fichier:PropagationData.png]]
  
 
''<font color=#FF0000>Note: the propagation will stop once the first event (date or altitude) will occur.</font>''
 
''<font color=#FF0000>Note: the propagation will stop once the first event (date or altitude) will occur.</font>''
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''<font color=#FF0000>Note: it is possible to retro propagate a trajectory by giving a negative duration or a date previous to the initial one.</font>''
 
''<font color=#FF0000>Note: it is possible to retro propagate a trajectory by giving a negative duration or a date previous to the initial one.</font>''
  
* Frame used for the propagation (only inertial ones among '''CIRF''', '''EME2000''' and '''GCRF'''); the first one is recommended in term of <font color=#FF8C00>CPU</font> time.
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* Frame used for the propagation (only inertial ones among '''CIRF''', '''EME2000''' and '''GCRF'''); the first one is recommended in term of <font color=#FF8C00 title="Central Processing Unit">CPU</font> time.
  
 
== Numerical integrator ==
 
== Numerical integrator ==
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* If the user chooses a <font color=#FF8C00>Runge Kutta</font>, only the step will have to be entered
 
* If the user chooses a <font color=#FF8C00>Runge Kutta</font>, only the step will have to be entered
 
* If the <font color=#FF8C00>Dormand Price</font> is selected the user will have to tune min/max steps and tolerances (but by default values are available).
 
* If the <font color=#FF8C00>Dormand Price</font> is selected the user will have to tune min/max steps and tolerances (but by default values are available).
 
''<font color=#FF0000>'''Note: be careful, the RK6 is not yet operationnal and may give some erroneous outputs.'''</font>''
 
 
   
 
   
 
[[Fichier:DOP.png]]
 
[[Fichier:DOP.png]]
  
''<font color=#FF0000>Note: in a future version some typical tuning will be proposed depending on the kind of orbit and the desired precision.</font>''
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''<font color=#FF0000>Note: since V11.4 and due to the V4.4 version of [http://patrius.cnes.fr PATRIUS] a specific option is available to by-pass the error mode when minimum step is reached. In that case, the precision given by tolerances will not be reached but the propagation will go on.</font>''
 +
 
 +
''<font color=#FF0000>Note: since V11.4 some typical tuning is proposed depending on the kind of orbit and the desired precision.</font>''

Version actuelle en date du 8 novembre 2019 à 10:20

In this tab we have to kind of information:

Propagation data

First, data linked to the propagation with:

  • Duration or date criteria for the end of the propagation
  • Value of the duration or the date of the end of the propagation
  • Altitude of the end of the propagation
  • Type of altitude (since V11.4)

PropagationData.png

Note: the propagation will stop once the first event (date or altitude) will occur.

Note: it is possible to retro propagate a trajectory by giving a negative duration or a date previous to the initial one.

  • Frame used for the propagation (only inertial ones among CIRF, EME2000 and GCRF); the first one is recommended in term of CPU time.

Numerical integrator

Then, we will have numerical integrator tuning:

  • If the user chooses a Runge Kutta, only the step will have to be entered
  • If the Dormand Price is selected the user will have to tune min/max steps and tolerances (but by default values are available).

DOP.png

Note: since V11.4 and due to the V4.4 version of PATRIUS a specific option is available to by-pass the error mode when minimum step is reached. In that case, the precision given by tolerances will not be reached but the propagation will go on.

Note: since V11.4 some typical tuning is proposed depending on the kind of orbit and the desired precision.