The Coarse Tracker plot shows the acquisition and tracking of the actual target’s elliptical motion with the servo line of sight:
To better illustrate accuracy, the Focal Plane plot shows the focal plane error. The darkened circular area represents the time after the servo has acquired the target and begins tracking. These results show errors to be on the order of 1o, exceeding the requirement.
It should be noted that to get to this level of control required tuning of each of the control loops with multiple iterations before an acceptable control was achieved.