Fig. 1. Block diagram of our work.

Fig. 2. Block diagram of signal processing board (i.e., BMUB).

Fig. 3. Nyquist stability diagram for different gain factors.

Fig. 4. Step response using our iteration method: (a) vertical pointing error; (b) vertical position error.

Fig. 5. Error for external disturbance suppression: (a) vertical pointing error; (b) vertical position error.

Fig. 6. Error without control: (a) vertical pointing error; (b) vertical position error.

Fig. 7. Error with control: (a) vertical pointing error; (b) vertical position error.