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CubeSatEnvironment:

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.
--------------------------------------------------------------------------
   Form:
   e = CubeSatEnvironment             % data structure
   e = CubeSatEnvironment( x, t, d )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   x        (14,1)    [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

   -------
   Outputs
   -------
   env        (.)     Environmental data
                      .r            ECI position (km)
                      .v            ECI velocity (km/s)
                      .q            ECI to body quaternion
                      .mu           Gravitational constant (km3/s2)
                      .planetRadius Radius of the planet (km)
                      .vRel         Velocity relative to the atmosphere (km/s)
                      .rho          Atmospheric density (kg/m3)
                      .radiation    Planetary radiation W/m2
                      .albedo       Planet bond albedo fraction
                      .uSun         Sun unit vector (ECI)
                      .rSun         Sun distance (km)
                      .solarFlux    Solar flux at position (W/m2)
                      .nEcl         Eclipse fraction (source intensity, 0-1)
                      .bField       Magnetic field (T)
 
--------------------------------------------------------------------------
   See also SunV1, Eclipse, AtmDens2, AtmJ70, BDipole
--------------------------------------------------------------------------

Children:

AeroUtils: AtmosphericCalculations/AtmDens2
AeroUtils: AtmosphericCalculations/AtmJ70
AeroUtils: Coord/ECIToEF
Common: Time/JD2T
CubeSat: Utilities/CubeSatAttitude
Math: Linear/Mag
Math: Linear/Skew
SC: Environs/BDipole
SC: Ephem/Eclipse
SC: Ephem/SunV1

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