RollYawEstimator:

Path: SpacecraftEstimation/AttitudeEstimation

% Estimates roll and yaw given a roll measurement and body rates.   
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   Form:
   xEst = RollYawEstimator( x, omega, roll, rollNoise, dT )
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   Inputs
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   x                 (2,1)  Initial [roll;yaw]
   omega             (3,:)  Body Rates
   roll              (1,:)  Roll angle (rad)
   rollNoise         (1,1)  1 sigma roll noise
   dT                (1,1)  Time step

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   Outputs
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   xEst              (2,:)  [roll;yaw]

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