Path: FormationFlying/Control
% Iterative impulsive maneuver delta-V
Computes the delta-v's required to implement a formation flying maneuver for a
single spacecraft. The desired relative state is iteratively recomputed,
bringing the desired state closer to the current state, until the largest
single delta-v in the maneuver is under the maximum limit.
A fixed thrust actuator is assumed when converting delta-v to burn duration.
Algorithms do not account for gravitational perturbations or disturbances.
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Usage:
[maneuver, foundSoln, resetGoals] = IterativeImpulsiveManeuver( state, goals, window, parameters );
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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, Alfriend format: [a,i,W,w,e,M]
- xH Measured relative state in Hills frame
- mass Spacecraft mass [kg]
- tM Timetag of measurement [sec]
goals (.) Geometric goals describing desired relative periodic 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)
- maxDeltaV Maximum delta-v
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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
foundSoln (1) Flag indicating whether a solution was found or not
resetGoals (1) Flag indicating whether the goals were reset or not
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AC: ACData/ACTConstants FormationFlying: Control/ImpulsiveLPManeuver FormationFlying: Control/ImpulsiveManeuver FormationFlying: Control/InPlane FormationFlying: Control/OptimalInPlaneDeltaV FormationFlying: Control/OutOfPlane FormationFlying: Coord/CirclePhase FormationFlying: Coord/EllipsePhase FormationFlying: Coord/GetHillsMats FormationFlying: Coord/InitializeFormation FormationFlying: Coord/IsCircGeom FormationFlying: Coord/IsEccGeom FormationFlying: Coord/RotateState FormationFlying: DataStructures/BurnData_Structure FormationFlying: DataStructures/EccGeometry_Structure FormationFlying: DataStructures/Geometry_Structure FormationFlying: DataStructures/Maneuver_Structure FormationFlying: DataStructures/PlanningParameters_Structure FormationFlying: DataStructures/Window_Structure FormationFlying: Dynamics/DiscreteHills FormationFlying: Dynamics/HillsEqns FormationFlying: EccDynamics/FFEccDH FormationFlying: EccDynamics/FFEccDiscreteHills FormationFlying: EccDynamics/FFEccGoals FormationFlying: EccDynamics/FFEccIntConst FormationFlying: EccDynamics/FFEccLawdensEqns FormationFlying: EccDynamics/FFEccLinOrb FormationFlying: EccDynamics/FFEccProp FormationFlying: EccDynamics/FFEccRMat FormationFlying: EccDynamics/FFEccXExt FormationFlying: EccDynamics/FFEccYExt FormationFlying: EccDynamics/FFEccZExt EccDynamics: Derivatives/FFEccDDX EccDynamics: Derivatives/FFEccDDY EccDynamics: Derivatives/FFEccDDZ EccDynamics: Derivatives/FFEccDX EccDynamics: Derivatives/FFEccDY EccDynamics: Derivatives/FFEccDZ FormationFlying: Guidance/PCGoals FormationFlying: LP/LPCircular FormationFlying: LP/LPCircularTimeWeight FormationFlying: LP/LPEccentric FormationFlying: LP/LPEccentricGVE FormationFlying: LP/LPEccentricTimeWeight FormationFlying: Transformation/DeltaElem2Hills FormationFlying: Transformation/FFEccGoals2Hills FormationFlying: Transformation/FFEccHills2DeltaElem FormationFlying: Transformation/FFEccHills2Goals FormationFlying: Transformation/GeometryCirc2Ecc FormationFlying: Transformation/GeometryEcc2Circ FormationFlying: Transformation/Goals2DeltaElem FormationFlying: Transformation/Goals2Hills FormationFlying: Transformation/Hills2DeltaElem FormationFlying: Transformation/Hills2ECI FormationFlying: Transformation/Hills2Goals FormationFlying: Utility/AccelVector2ManeuverStruct FormationFlying: Utility/FFEccTargetTrueAnom FormationFlying: Utility/ManeuverStruct2AccelVector FormationFlying: Utility/MeanAnom2TrueLat FormationFlying: Utility/NOrbVector FormationFlying: Utility/Nu2TimeDomain FormationFlying: Utility/NuDot FormationFlying: Utility/Time2NuDomain FormationFlying: Utility/TimeUntilTheta FormationFlying: Visual/CostVis FormationFlying: Visual/FFEccAnalyzeShape FormationFlying: Visual/HillsFramePlot Orbit: OrbitCoord/Alfriend2El Orbit: OrbitCoord/El2Alfriend Orbit: OrbitCoord/OrbElemDiff Orbit: OrbitCoord/SLR Orbit: OrbitMechanics/GVEDynamics Orbit: RHSOrbit/LinOrb SC: BasicOrbit/CP2I SC: BasicOrbit/E2M SC: BasicOrbit/E2Nu SC: BasicOrbit/El2RV SC: BasicOrbit/M2E SC: BasicOrbit/M2EApp SC: BasicOrbit/M2EEl SC: BasicOrbit/M2EHy SC: BasicOrbit/M2Nu SC: BasicOrbit/M2NuAbs SC: BasicOrbit/M2NuPb SC: BasicOrbit/Nu2E SC: BasicOrbit/Nu2M SC: BasicOrbit/Nu2MAbs SC: BasicOrbit/OrbRate SC: BasicOrbit/Period SC: BasicOrbit/RV2El SC: SCData/sCTConstants Common: CommonData/Constants Common: CommonData/SwooshWatermark Common: CommonData/xSplashSmall Common: Control/C2DZOH Common: Database/Constant Common: General/CellToMat Common: General/DeBlankLT Common: General/DeleteCell Common: General/DispWithTitle Common: General/MatToCell Common: General/StringMatch Common: General/Watermark Common: Graphics/AddView Common: Graphics/AddZoom Common: Graphics/Mesh2 Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/PltStyle Common: Graphics/XLabelS Common: Graphics/YLabelS Common: Graphics/ZLabelS Math: Analysis/Simplex Math: Analysis/Simplex2 Math: Linear/Cross Math: Linear/Dot Math: Linear/DupVect Math: Linear/InvP Math: Linear/Mag Math: Linear/Unit Math: Solvers/NewtRaph Math: Trigonometry/UnwrapPhase Math: Trigonometry/WrapPhase
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