Abstract: Deep-sea exploration submersible will face a severe test after failure and loss of contact,it is very important to predict its location and rescue it in time.However,the deep-sea submersible is affected by many uncertain factors such as ocean current,seawater salinity and seabed topography,so it is very difficult to accurately predict its position.To solve this problem,the traditional single factor analysis method has great defects,and it is difficult to accurately describe the motion mode of submersible in complex marine environment.The coupling analysis of uncertain multiple factors in the deep-sea environment is carried out,a multi-factor coupled motion model of missing submersible is established based on differential equation,and the motion trajectory of submersible under the influence of eight kinds of terrain and other factors is classified and simulated and visually displayed,which provides decision support for the positioning and searching of deep-sea exploration submersible.Experimental results show that the model can accurately determine the position of submersible in complex marine environment with high accuracy,which is better than other baseline algorithms.

Key words: Submersible, Submarine topography, Ocean currents, Differential equation, Simulation