Fig. 1. Schematic of reflected light for corner retroreflector

Fig. 2. Effective diffraction region of corner retroreflector at different incidence conditions. (a) φ＝0°；(b) φ＝25°；(c) φ＝50°

Fig. 3. Diffraction area ratio of corner retroreflector changed with incident angle

Fig. 4. Positions of the simulated corner retroreflector and existing corner retroreflector on the lunar surface^[2]

Fig. 5. Angles between the J2000.0 geocentric pointing retroreflector in the Mare Nectaris and the laser beam from different ground stations. (a) APOLLO; (b) GRASSE; (c) YNAO

Fig. 6. Angles between J2000.0 geocentric pointing retroreflector in Shacklten Crater and laser beam from different ground stations. (a) APOLLO; (b) GRASSE; (c) YNAO

Fig. 7. Angles between J2000.0 geocentric pointing retroreflector in CE-3 landed area and laser beam from different ground stations. (a) APOLLO; (b) GRASSE; (c) YNAO

Fig. 8. Angles between optimized pointing retroreflector in Shacklten Crater and laser beam from different ground stations. (a) APOLLO; (b) GRASSE; (c) YNAO

Fig. 9. Monthly cumulative effective observation area of ground stations by optimized pointing retroreflector on three typical regions. (a) CE-3; (b) Mare Nectaris; (c) Shacklten Crater