Measurement and analysis of laser scattering characteristic of sea surface under condition of super-low-altitude

It is necessary to know the laser scattering characteristics of sea surface in different sea conditions when designing the laser radar using in super-low altitude. According to the design requirements, low altitude radar work situation was simulated by the wave tank facility to solve the difficulty of actual sea environment testing, and the quantitative control of influence factors of sea surface laser scattering was realized. By using the laser scattering measurement system, the near field laser scattering data of various states and different beam irradiation angles were obtained, and the laser scattering characteristics of sea surface with regular sinusoidal wave and irregular PM spectrum were given by statistical analysis. The result shows that there are large differences between sea surface and Lambertian surface and mirror reflection should be main ingredients in the sea surface scattering distribution. Laser scattering echo fluctuation changes with the spatial wavelength of the sea surface wave and the cattering size increases with the increase of grazing angle. Furthermore, the higher the sea condition is, the stronger the corresponding scattering echo is at a fixed grazing angle, but scattering echo size will not change with the sea conditions when the grazing angle is large enough.