Second-order sliding mode controller and automatic carrier landing system is designed. The result of simulation research shows the system has good capability of air attenuation.

The scattering of fog particle influence the images by three aspects: the attenuation of object light, the scattering of air light and the multi-scattering of fog particle.

Air-fluid level in the left maxillary sinus (red arrow) containing high attenuation is consistent with hematoma.