Fig. 1. Plane parallel boundary atmosphere and spherical boundary atmosphere
(a): Parallel boundary ice crystal particle clouds;(b): Spherical boundary ice crystal particle clouds

Fig. 2. Schematic diagram of spatial differential operator

Fig. 3. Direct attenuation of laser beam through cirrus cloud for air-to-ground communication link
(a): Direct attenuation of the laser at different wavelengths;(b): Direct laser attenuation at different effective radius

Fig. 4. Influence of optical thickness of cirrus cloud on laser transmittance

Fig. 5. Influence of cirrus effective radius on laser transmittance

Fig. 6. Relationship between the laser transmittance of cirrus cloud and the view Angle at different relative azimuth angles

Fig. 7. Relationship between laser transmittance and view Angle for different models