Fig. 1. Sun glint observation geometry based on an ideal sphere model

Fig. 2. Sun glint observation geometry based on the WGS-84 ellipsoid model

Fig. 3. Flow chart of the sun glint position algorithm based on the WGS-84 model

Fig. 4. Flow chart of improved sun glint location algorithm considering coplanar conditions

Fig. 5. Pointing mirror coordinate system. (a) Along the Y axis; (b) along the X axis

Fig. 6. Sun glint position distance error of the ideal sphere model. (a) Spring equinox; (b) summer solstice; (c) winter solstice

Fig. 7. Sun glint position distance error of the WGS-84 ellipsoid model before improvement. (a) Spring equinox; (b) summer solstice; (c) winter solstice

Fig. 8. Sun glint position distance error of the WGS-84 ellipsoid model after improvement. (a) Spring equinox; (b) summer solstice; (c) winter solstice

Fig. 9. Two-dimensional pointing angle error before and after algorithm improvement. (a) Before improvement; (b) after improvement