Path: Orbit/GravityModels
% Load the GEMT1 data.
If there is only one output it will output a data structure.
GEM is "Goddard Earth Model". GEMT1 dates to 1987.
Loads the GEMT1 mat-file. Corrects the c(2,1) and s(2,1) coefficients for
consistency with the IERS Terrestrial reference frame
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Form:
gravityModel = LoadGEM( unNorm )
[sO, c, j, mu, a] = LoadGEM( unNorm )
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Inputs
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unNorm If any input here generate unnormalized coefficients
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Outputs
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s0 (36,36) S terms s(n,m) where n and m are degree and order of the model.
c (36,36) C terms c(n,m)
j (36) m = 0 terms
mu Spherical gravitational potential
a Earth radius
or
gravityModel (.) Data structure
.name (1,:) Model name
.mu (1,1) Gravitational constant (km^3/sec^2)
.a (1,1) Model earth radius (km)
.c (n,n) Cosine coefficients
.s (n,n) Sine coefficients
.j (1,n) Zonal harmonics
.isNormalized (1,1) Boolean
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Reference: Seidelmann, P.K, (ed) (1992). Explanatory Supplement to the
Astronomical Almanac. University Science Books, Mill Valley, CA.
pp. 227-233.
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SC: SCMat/GEMT1 Common: CommonData/SwooshWatermark Common: General/CellToMat Common: General/DeBlankLT Common: General/MatToCell Common: General/Watermark Common: Graphics/Mesh2 Common: Graphics/NewFig Common: Graphics/Plot2D Common: Graphics/PltStyle Common: Graphics/XLabelS Common: Graphics/YLabelS Common: Graphics/ZLabelS Math: Linear/DupVect Math: Linear/Factorl
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