Underwater stratified model based on ARGO data and laser transmission characteristics

With the development of photoelectric detection technology, blue-green laser underwater transmission and target detection have become a hot research field. At present, most of the underwater laser attenuation channel models regard seawater as a homogeneous medium, and a few layered models only consider the change of chlorophyll concentration with seawater depth, and the number of layers is small. This paper not only considers the influence of chlorophyll concentration, but also introduces the influence of temperature and salinity, increases the number of stratification intervals, and improves the seawater stratification model. Based on the measured data of temperature, salinity and chlorophyll concentration in the vertical direction of seawater provided by the Array for Real-time Geostrophic Oceanography data center website of China, the vertical distribution of seawater attenuation coefficient is given. Using this distribution, the seawater is stratified, and a more accurate vertical stratification model of seawater in the Pacific near Japan is established. Using the vertical stratification model of seawater established in this paper, the transmission process of blue-green laser underwater is simulated based on Monte Carlo method. The results show that with the increase of transmission distance, the number of photon packets on the receiving plane in layered seawater is always larger than that in uniform seawater. The photon packet energy on the receiving plane in the case of stratified seawater and the photon packet energy in the case of uniform seawater increase alternately, which provides a reference for the transmission characteristics of laser in actual seawater.