Fig. 1. Schematic of system

Fig. 2. Schematic of rough tracking module

Fig. 3. Schematic of precision tracking module

Fig. 4. Internal structure of sensor and installation positions

Fig. 5. Sampling circuit in sensor

Fig. 6. Flow chart of software

Fig. 7. Schematic of experimental device

Fig. 8. Physical picture of wide range photoelectric tracking sensor

Fig. 9. Structural diagram of double-axis tracking device

Fig. 10. Schematic of installation position of light source

Fig. 11. Photosensitive resistance voltage versus altitude and azimuthal angle. (a) Altitude angle; (b) azimuthal angle

Fig. 12. Schematic of precision tracking and measurement