BShuster:

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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. 
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   Form:
   [ra,dec,p] = BShuster( usun, unadir, sa, tle, tte, cant, eradius,
                          spinrate, threshold, dihedral, sigmas, sigmae, sigman )
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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                    Leading edge times
   tte                    Trailing edge time
   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)
   sigmas                 Standard deviation of each sun measurement
   sigmae                 Standard deviation of each nadir measurement
   sigman                 Standard deviation of each dihedral measurement

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   Outputs
   -------
   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:

AeroUtils: Coord/U2RADec
Math: Linear/Cross
Math: Linear/Unit