Path: FormationFlying/SafeGuidance
% The Nominal Safe Guidance method.
Define a safe relative orbit and plan a 1-2 burn maneuver to reach it.
The safe relative orbit is a 2x1 relative in-plane ellipse, with a
cross-track oscillation that provides a minimum cross-track separation
where the ellipse intersects the along-track axis. The relative ellipse
is chosen such that:
* it can be reached with a single, immediate delta-v
* it does not intersect with a 2x1 elliptical avoidance region
* its semi-major axis is greater than the defined minimum value
* it requires the lowest delta-v to meet the above constraints
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Form:
[deltaV,desTraj,inside] = NominalSafeGuidance( inputs, parameters, state );
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Inputs
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inputs (.) Input data from other modules
parameters (.) Parameters that may be adjusted
state (.) Absolute and relative state information
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Outputs
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deltaV (.) Delta-V sequence data structure
.dV (3,N) Set of N Hills-frame delta-v's [km/s]
.t (1,N) Time for each delta-v's [MET]
desTraj (.) Desired relative trajectory
.y0 Along-track offset of relative ellipse
.aE Semi-major axis of relative ellipse
.zA Cross-track value at along-track axis crossing
.zR Cross-track value at radial axis crossing
tracking (.) Tracking performance of current trajectory
.drift Along-track drift per orbit [km]
.yA Cross-track offset at along-track crossing [km]
.zOsc Smallest radial oscillation [km]
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FormationFlying: SafeGuidance/ComputeRE FormationFlying: SafeGuidance/CrossTrackDeltaV FormationFlying: SafeGuidance/EllipseDeltaV FormationFlying: SafeGuidance/HillsEqnsSLO FormationFlying: SafeGuidance/RadialOscillation FormationFlying: SafeGuidance/YRMax
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