SFShustr2:
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Computes the solution to the attitude determination problem using
Schuster's single frame method. Uses sun angles, dihedral angles
and chordwidths.
Requires the corresponding sun vectors and nadir vectors.
The 4th and 5th inputs can either be leading and trailing edge times
or chordwidths and mid-scan dihedral angles, respectively. The last
input must be set to either 'time' or 'angl'. The default is 'time'.
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Form:
[ra, dec, rd] = SFShustr( usun, unadir, sa, tle_cw, tte_da, cant, eradius,
spinrate, threshold, dihedral, type )
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Inputs
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usun (3,n) Unit sun vector
unadir (3,n) Unit nadir vectors
sa (1,n) The angle between the sun line and the spin axis
tle_cw (1,n) Leading edge times (sec) or chordwidths (rad)
tte_da (1,n) Trailing edge time (sec) or mid-scan dihedral angles (rad)
cant Cant angle (rad)
eradius (1,n) Angular radius of the rearth (rad)
spinrate Spin rate (rad/sec)
threshold Threshold chord width (rad)
dihedral Dihedral angle of hsa (rad)
type 'time' = leading and trail edge times entered (default)
'angl' = chordwidths and dihedral angles entered
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Outputs
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ra Right ascension of the spin axis
dec Declination of the spin axis
rd (2,n) [Right Ascension;Declination] vector
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References: Shuster, M.D., Efficient Algorithms for Spin-Axis Attitude
Determination, The Journal of the Astronautical Sciences,
Vol. XXXI, No. 2, April-June, 1983, pp. 237-249.
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Children:
Common: Graphics/NewFig
Common: Graphics/XLabelS
Common: Graphics/YLabelS
Math: Linear/Unit
