Orbital Mission Sequence

mission_sequence
   <constraint>
   event
      Common Mission Event Commands
      mission event-specific commands ...
   end_event

   ... additional mission event definitions
end_mission_sequence

mission_sequence … end_mission_sequence

Specify a sequence of pre-determined orbital mission events. The first mission event specified is executed first, then the second, etc. An optional constraint can be specified to delay execution of the sequence; otherwise the mission event will begin executing at the creation time of the platform.

Event types that can be placed in a sequence include the following:

Orbital Maneuver Events:

• Change Eccentricity

• Change Inclination

• Change Right Ascension of Ascending Node (RAAN)

• Change Right Ascension of Ascending Node (RAAN) and Inclination

• Change Semi-Major Axis

• Circularize

• Compound

• Delta_V

• Drift

• Hohmann Transfer

• Intercept

• Match Velocity

• Natural Motion Circumnavigation

• Normal

• Rendezvous

• Tangent

• Target

• Teardrop

Non-Orbital Maneuver Events:

• Change Attitude

• Perform Staging

• Scripted

// Example: Two mission events to raise a satellite
// from an initial injection point
// into a geosynchronous transfer orbit  (GTO)
mission_sequence
   // Constraint: delay two full orbits before executing
   execute_at orbit 2 relative_time 0.0 s

   // intermediate orbit
   event change_semi_major_axis
      semi_major_axis  9000 km
      execute_at orbit 2 ascending_node // Constraint with orbit delay
   end_event

   // GTO
   maneuver change_semi_major_axis  // "maneuver ... end maneuver" block may be used with orbital maneuver types.
      semi_major_axis 24821 km
      execute_at ascending_node // Constraint without orbit delay
   end_maneuver
end_mission_sequence

Note

Orbital mission events and mission event sequences are scriptable using the script methods WsfSpaceMover.ExecuteEvent (WsfSpaceMover.ExecuteManeuver) and WsfSpaceMover.ExecuteMissionSequence.