RHSGyro:

Path: SpacecraftEstimation/StellarAttDet

% RHSGyro models a rate gyro or rate integrating gyro  (RIG)

 Set d.rIG to true for a rate integrating gyro. If an RIG, the state
 will be length 6.
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   Form:
   [xDot, y] = RHSGyro( x, ~, d )
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   ------
   Inputs
   ------
   x   (6,1)	State [b;integral omega]
   t   (3,1) Time (unused)
   d   (.) Data structure
          .rIG         (1,1) True for RIG
          .randomWalk  (3,1) Random walk noise (rad/s)
          .angleNoise  (3,1) Angle noise (rad)
          .sigma       (1,1) Markovian 1/tau

   -------
   Outputs
   -------
   xDot (6,1)	State d[b;integral omega]/dt

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