ImpulsiveManeuver:
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Computes a delta-v sequence for a relative orbit maneuver in a circular orbit
A constant thrust is assumed when converting delta-v to burn duration.
Algorithms do not account for gravitational perturbations or disturbances.
A circular reference orbit is assumed.
The delta-v sequence is determined from a closed-form solution, derived from
Gauss' variational equations.
Since version 7.
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Inputs
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state (.) Data structure of the orbit state with following fields
- el Measured mean orbital elements of reference [a,i,W,w,e,M]
- elA Alfriend format of elements [a,lat,i,q1,q2,W]
- xH Measured Hills-frame state: [x;y;z;xdot;ydot;zdot]
- mass Spacecraft mass [kg]
- tM Timetag of measurement [sec]
goals (.) Data structure of geometric goal information.
Describes the desired trajectory.
window (.) Data structure of commanded time window with following fields
- startTime Earliest possible start time [sec since 1970]
- nOrbMin Minimum number of orbits maneuver may last [orbits]
- nOrbMax Maximum number of orbits maneuver may last [orbits]
- nManeuvers Number of maneuvers to search over
- timeWeightExp Time-weighting exponent (greater than 0)
parameters (.) Data structure of planning parameters with following fields
- fNom Nominal Thruster force [kN]
- dTMax Maximum allowable burn duration [sec]
- horizon Minimum time between planning and first burn [sec]
- tDelayOOP Minimum time between final IP burn and OOP burn [sec]
- nSPOCoarse Number of samples per orbit for LP (coarse computation)
- nSPOFine Number of samples per orbit for LP (fine computation)
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Outputs
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maneuver (.) Maneuver data structure with following fields
- t0 Earliest burn start time
- tF Latest burn finish time
- nBurns Number of burns required
+ burnData[] Array of burn data structures with following fields
- t Burn start time [sec since 1970]
- dT Burn duration [sec]
- dV Delta-V [km/s]
- uX unit x Hills direction
- uY unit y Hills direction
- uZ unit z Hills direction
maxDV (1) The maximum delta-v of the sequence
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Children:
FormationFlying: Control/InPlane
FormationFlying: Control/OutOfPlane
FormationFlying: Coord/InitializeFormation
FormationFlying: DataStructures/Maneuver_Structure
FormationFlying: Dynamics/DiscreteHills
FormationFlying: Dynamics/HillsEqns
FormationFlying: Guidance/PCGoals
FormationFlying: Transformation/Goals2DeltaElem
FormationFlying: Transformation/Hills2DeltaElem
FormationFlying: Utility/ManeuverStruct2AccelVector
FormationFlying: Utility/NOrbVector
FormationFlying: Visual/HillsFramePlot
Math: Linear/Mag
Orbit: OrbitCoord/Alfriend2El
Orbit: OrbitCoord/El2Alfriend
Orbit: OrbitCoord/SLR
OrbitMiniToolbox: Support/El2RV
SC: BasicOrbit/OrbRate
