Integrator

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)

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).

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.