Fig. 1. Latitude of sun during one year

Fig. 2. BRDF of Si and GaSa

Fig. 3. Angle width of specular reflections of Si and GaSa

Fig. 4. Magnitude of GaSa solar arrays under incident angle of 30°

Fig. 5. Picture of GEO communication satellite

Fig. 6. Magnitude of the whole satellite

Fig. 7. Geometry relationship of satellite optical detection

Fig. 8. Elevation angle of facility on different latitudes

Fig. 9. Glint date of different latitudes of sun

Fig. 10. Number of days of different latitudes of sun

Fig. 11. Magnitude curves of satellite. (a) Solar doesn’t track the sun; (b) solar tracks the sun

Fig. 12. Magnitude curves detected from different latitudes of facility. (a) Facility at 40°N; (b) facility at 60°N

Fig. 13. Magnitude curves detected in different delayed days. (a) 10 days delayed; (b) 20 days delayed