Path: FormationFlying/SafeGuidance
% The Safe Guidance Mode.
The desired relative trajectory and the delta-v sequence to achieve it
will be computed each cycle. The results will be made available as
telemetry at all times.
The delta-v command will be executed only when
safe mode has been entered and the appropriate conditions have been met.
Conditions for commanding ANY delta-v (nominal OR immediate separation)
1 SAFE MODE has been entered
2 either:
a) the thruster is ready to fire (heated to nominal conditions) OR
b) there is a high probability of collision within the next 20-30
minutes (this based on the time required to heat the thrusters)
3 we are NOT waiting for a previous maneuver to complete
Further conditions for executing an immediate separation maneuver:
1 the MAIN is inside the PASSIVE avoidance region
Further conditions for executing a nominal safe guidance maneuver:
1 the MAIN is outside the PASSIVE avoidance region
2 we have exceeded the deadband
Since version 10.
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Form:
[out,telem] = SafeGuidance( inputs, parameters ); % w/ full sim
[out,telem] = SafeGuidance( inputs, parameters, state ); % w/ rel sim
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Inputs
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inputs (.) Input data from other modules
.t (1) Time [MET]
.mass (1) Current spacecraft mass [kg]
.safeMode (1) Flag. Are we in safe mode?
.maneuverImmediately (1)
.thrusterHeatNominal (1)
.thrusterHeatEmergency (1)
parameters (.) Tunable parameters
.dTMin (1) Minimum impulse bit [sec]
.dVMax (1) Maximum delta-v [km/s]
.margin (1) Distance margin around avoidance region [km]
.fNom (1) Nominal force of thruster [kN]
.dMin (1) Min. sep. dist. (passive orbit) [km]
.minTimeBtwnDeltaVs (1) Min. time between delta-v's [sec]
.mvrHorizon (1) Time between planning and burn [sec]
state (.) Absolute and relative state information
.el (1,6) Orbital elements (standard)
.xSLO (6,1) Relative state, SLO-frame
.n (1) Mean orbit rate [rad/s]
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Outputs
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outputs (.) Output data to other modules
.deltaV (.) Data strucutre of delta-vs and times
telemetry (.) Telemetry data
.immediate (1) Algorithm branch: inside avoidance region
.nominal (1) Algorithm branch: outside avoidance region
.x0 (1) Along-track offset of relative ellipse
.aE (1) Semi-major axis of relative ellipse
.yA (1) Cross-track value at along-track axis crossing
.yR (1) Cross-track value at radial axis crossing
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FormationFlying: SafeGuidance/AlongTrackMotion FormationFlying: SafeGuidance/ComputeRE FormationFlying: SafeGuidance/CrossTrackDeltaV FormationFlying: SafeGuidance/EllipseDeltaV FormationFlying: SafeGuidance/HillsEqnsSLO FormationFlying: SafeGuidance/NominalSafeGuidance FormationFlying: SafeGuidance/RadialOscillation FormationFlying: SafeGuidance/RestrictDeltaV FormationFlying: SafeGuidance/SeparationGuidance FormationFlying: SafeGuidance/YRMax Common: CommonData/SwooshWatermark Common: General/CellToMat Common: General/MatToCell Common: General/Watermark Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/PltStyle Math: Linear/Mag
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