Path: Interplanetary/Mechanics
% Search for multiple minima in a porkchop plot
Classic impulsive interplanetary trajectories have two minima, dubbed
Type I and Type II. These correspond to trajectories with less than 180
degree arc and more than 180 degree arc, or the "short" and "long" way.
Either the short or the long transfer may be the minimum delta-V for the
launch opportunity. This routine computes the full Lambert solution
including the launch geometry for each minima. If plots are requested, it
will create the porkchop plot and plot the Lambert transfers.
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Form:
[type1,type2] = PorkChopMin( dateRange,tOFRange, planet1, planet2, type, doPlot )
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Inputs
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dateRange (1,2) [jDStart jDEnd] (Julian date)
tOFRange (1,2) [tOFStart tOFEnd] (days)
planetDep (1,:) Departure planet (Only major planets)
planetArr (1,:) Arrival planet (Only major planets)
type (1,1) 1: departure DV (default) 2: total DV
doPlot (1,1) Create plots and text printout
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Outputs
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type1 (.) Short opportunity struct
.dV.total (1,1) Total DV (km/s)
.dV.a (3,1) First DV (km/s)
.dV.b (3,1) Second DV (km/s)
.jDDep (1,1) Departure date
.jDArr (1,1) Arrival date
.tOF (1,1) Time of flight (days)
.tM (1,1) Transfer flag (+/-1)
.rAL (1,1) Launch ascension (rad)
.decL (1,1) Launch declination (rad)
type2 (.) Long opportunity struct
See also: PorkChopTOF, PorkChopPlot
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AerospaceUtils: Coord/U2RADec Interplanetary: Ephemeris/PlanetPosJPL Interplanetary: Mechanics/PorkChopTOF Orbit: OrbitMechanics/LambertTOF Orbit: Visualization/PlotLambertTransfer Orbit: Visualization/PorkChopPlot SC: BasicOrbit/RV2El Common: Database/Constant Common: General/StringMatch Common: Time/Date2JD Common: Time/JDToDateString Math: Linear/Unit
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