BShuster2:
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Computes the solution to the attitude determination problem using
Schuster's batch 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,p] = BShuster( usun, unadir, sa, tle_cw, tte_da, cant, eradius,
spinrate, threshold, dihedral, sigmas, sigmae, sigman, 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 Leading edge times (sec) or chordwidths (rad)
tte_da Trailing edge time (sec) or mid-scan dihedral angles (rad)
cant Cant angle (rad)
eradius (1,n) Angular radius of the earth (rad)
spinrate Spin rate (rad/sec)
threshold Threshold chord width (rad)
dihedral Dihedral angle of hsa (rad)
Send an empty matrix for chordwidths and mid-scan dihedral angles
sigmas Standard deviation of each sun measurement
sigmae Standard deviation of each nadir measurement
sigman Standard deviation of each dihedral measurement
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
p Covariance
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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:
Math: Linear/Unit
