Path: CubeSat/Simulation
% Environment calculations for the CubeSat dynamical model.
Uses the J70 atmosphere model or AtmDens2 if the data required by J70 is
absent. Computes sun location with SunV1 and accounts for eclipses from the
Earth via Eclipse. All environment constants including gravity are defined
here.
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Form:
env = CubeSatEnvironment % data structure
env = CubeSatEnvironment( x, t, d )
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Inputs
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x (14,1) State, [r;v;q;w;b]
t (1,1) Time, sec
d (.) Data structure
.jD0 Julian date of epoch
.att (.) Attitude
.atm (.) optional; empty to skip J70 and use AtmDens2
.surfData (.) optional; empty to skip drag/optical calcs
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Outputs
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env (.) Environmental data
.r (3,1) ECI position (km)
.v (3,1) ECI velocity (km/s)
.q (4,1) ECI to body quaternion
.mu (1) Gravitational constant (km3/s2)
.radiusPlanet (1) Radius of the planet (km)
.vRel (3,1) Velocity relative to the atmosphere (km/s)
.rho (1) Atmospheric density (kg/m3)
.radiation (1) Planetary radiation (W/m2)
.albedo (1) Planet bond albedo fraction
.uSun (3,1) Sun unit vector (ECI)
.rSun (1) Sun distance (km)
.solarFlux (1) Solar flux at position (W/m2)
.nEcl (1) Eclipse fraction (source intensity, 0-1)
.bField (3,1) Magnetic field, ECI frame (T)
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See also SunV1, Eclipse, AtmDens2, AtmJ70, BDipole
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AerospaceUtils: AtmosphericCalculations/AtmDens2 AerospaceUtils: AtmosphericCalculations/AtmJ70 AerospaceUtils: AtmosphericCalculations/BaromExp AerospaceUtils: AtmosphericCalculations/DiffusionExp AerospaceUtils: Coord/ECIToEF AerospaceUtils: Coord/QLVLH CubeSat: Utilities/CubeSatAttitude SC: BasicOrbit/Period SC: BasicOrbit/RVFromKepler SC: Environs/BDipole SC: Ephem/EarthRte SC: Ephem/Eclipse SC: Ephem/MSidDay SC: Ephem/SunV1 Common: CommonData/SwooshWatermark Common: General/CellToMat Common: General/DeBlankLT Common: General/MatToCell Common: General/Watermark Common: Graphics/NPlot Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/Plot3D Common: Graphics/PltStyle Common: Graphics/TimeLabl Common: Graphics/TitleS Common: Graphics/XLabelS Common: Graphics/YLabelS Common: Graphics/ZLabelS Common: Quaternion/Mat2Q Common: Quaternion/QMult Common: Time/DTAToDTS Common: Time/DTSToDTA Common: Time/Date2DN Common: Time/Date2JD Common: Time/JD2000 Common: Time/JD2DN Common: Time/JD2Date Common: Time/JD2T Common: Time/T2JD Math: Linear/Cross Math: Linear/Dot Math: Linear/DupVect Math: Linear/Mag Math: Linear/Skew Math: Linear/Unit Math: MathUtils/R2P5 Math: Trigonometry/ACosD Math: Trigonometry/CosD Math: Trigonometry/SinD
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