Due to the absorption and scattering effects of light in water,propagation characteristics of lasers underwater become complicated.In particular,the backscatter causes the target contrast to decrease,which makes the use of lasers in underwater detection face agreat challenge.Carrier modulation technique can be used to suppress the backscatter for underwater lidar.Computer simulation based on Monte Carlo method is used to establish an underwater detection model for photons of Gaussian pulse lasers modulated ...