This section gives some background information about how the ACU works.

Chapter 8.1 Angle Measurement describes how the ACU measures the antenna pointing and how it calculates the angles displayed at the user interface.

Chapter 8.2 Pointing / Motor Control describes the way the ACU performs the antenna pointing and how it controls the motors.

Chapter 8.3 Steptrack describes the step track method used by sat-nms ACUs providing this function.

Chapter 8.4 Adaptive Tracking describes the adaptive (orbit prediction) tracking method used by sat-nms ACUs providing this function.

Chapter 8.5 Program Tracking describes the program / file tracking capability built into the sat-nms ACU.

Chapter 8.6 Prediction Tracking with Ephemeris Data describes the Intelsat eleven Parameter (I11) and the Two Line Elements (TLE) tracking capability built into the sat-nms ACU.

Chapter 8.7 Polarization Prediction describes the feature of the sat-nms ACU to use polarization prediction for inclined orbit satellite tracking.

Chapter 8.8 Faults and Tracking describes the specific faults which can be happen during the tracking with the sat-nms ACU.