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SUPPORT SITE |
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SUPPORT SITE |
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Path: SC/Environs
% Computes the Earth magnetic field using the DGRF/IGRF model.
This model only is valid for the Earth. Use MagFieldPlanet
for all other planets. The model is loaded from IGRF11.mat if no
dataFile or coefficients are given.
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Form:
[b, g, h] = MagField( position, jD, nMax, dataFile)
b = MagField( position, jD, nMax, g, h )
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Inputs
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position (3,:) Position in ECI (km)
jD (1,1) Julian date
nMax (1,1) Maximum number of terms used. Enter an empty matrix
to use all available terms
dataFile (1,:) Optional, The file name of a .mat file
which contains the magnetic field data.
The variables which must be stored in
dataFile are: dateOfModel, g, gDot, h,
and hDot. This may also be the name of
a structure with fields .h, .g, .gDot, .hDot
and .dateOfModel
- or -
g Optional, but speeds execution
h Optional, but speeds execution
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Outputs
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b (3,:) The magnetic field in ECI (T)
g The (full) g coefficient matrix for dateTime
h The (full) h coefficient matrix for dateTime
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References: Wertz, J., Spacecraft Attitude Determination and Control,
Kluwer, 1976, pp. 779-781.
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See also: ECIToEF, MagFieldPlanet
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AerospaceUtils: Coord/ECIToEF Common: Graphics/Plot2D Common: Time/Date2JD Common: Time/JD2000 Common: Time/JD2T Math: Linear/Cross Math: Linear/Unit SC: BasicOrbit/RVFromKepler SC: Environs/MagFieldPlanet SC: SCMat/IGRF11
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