Orbit Module

Directory List

GravityModels	OrbitCoord	OrbitManeuver
OrbitMechanics	RHSOrbit	Visualization

GravityModels

LoadGEM	Load the GEMT1 data.
LoadGravityModel	Load a spherical harmonic gravity model (.geo) from GSFC/U. of Texas at Austin.
LoadSGM150	Load the SGM150 Lunar gravity model.
NormalizationMatrix	Generate a normalization matrix for spherical harmonics
UnnormalizeGravity	Remove normalization from a gravity model

OrbitCoord

AE2RPRA	Converts semi-major axis and eccentricity to right perigee and apogee.
Alfriend2El	[a,th,i,q1,q2,W] -> [a,i,W,w,e,M]
ConvertNORAD	Convert NORAD TLE string into a data structure.
ENUToECEF	Compute the transformation matrix that rotates ENU to ECEF coordinates.
El2Alfriend	Convert the standard orbital element set into an Alfriend orbital element set
OrbElemDiff	Computes the differences between orbital element vectors.
RAzToLatLon	Transform (range,azimuth) to (latitude,longitude) coordinates.
RPRA2AE	Converts perigee and apogee to semi-major axis and eccentricity
SLR	Computes the semi-latus rectum.

OrbitManeuver

Find a coplanar orbit with a different altitude

OrbitMechanics

AGravity	Compute the gravitational acceleration in spherical coordinates.
AGravityC	Compute the gravitational acceleration in cartesian coordinates.
APlanet	Perturbing acceleration due to a planet on a spacecraft.
NORAD	Propagates the NORAD two line elements (TLE), ex. SGP, SGP4, SGP8.
NORADToEl	Convert NORAD to Keplerian elements.
PropagateTLE	Propagates the NORAD two line elements, ex. SGP, SGP4, SGP8.
PropagateTLECommonTime	Propagates a set of NORAD two line elements with a common time frame.
RVOrbGen	Generate an orbit by propagating Keplerian elements.

RHSOrbit

Computes the right hand side for Earth gravity with J2.

Visualization

EarthMoon	Plot an orbit track in the Earth/Moon System.
OrbTrack	Plot a planet-fixed orbit track in 2D or 3D.

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