Fig. 1. Composition of 3D ship deformation measurement system based on FSO

Fig. 2. Simulation of cross creation process. (a) Original cross image; (b) Gaussian filter; (c) cross image on the detector; (d) cross image after adding 3D deformation angles

Fig. 3. Schematic of influence of the roll angle of ship on the image coordinate system

Fig. 4. Schematic of driving circuit

Fig. 5. Error standard deviation of 3D deformation angles under different atmospheric turbulence intensities

Fig. 6. Calculation result of Rytov variance based on Cn2 monthly average value. (a) Statistical results of Cn2 from January to December; (b) Rytov variance

Fig. 7. Atmospheric absorption of infrared wave band in mid-latitude (a) summer and (b) winter