Fix the following error in the rotator Simulink model. There is the problem of physical model in plant that the rotator's position will differ from the related position command gradually until the trigger of followingError (the difference >= threshold) and this stops the motion of rotator. According to the observation, this happens if the rotator moves in the negative direction.

In the following figure, there are two targets: (1) position=1.2 deg and velocity=0.01 deg/sec and (2) position=1.5 deg and velocity=-0.01 deg/sec. The total simulation time is 20.1 sec. There is no big difference between the position command and position. The error of noNewTrackCmdError after the slew of the second target is triggered as expected.

However, if the second target has position=-1.5 deg and velocity=-0.01 deg/sec, the following error is triggered while the rotator turns the direction to slew to the second target: