Research On Multi-electrode Underwater Electric Field Positioning Technology

The 21 st century is known as the century of the ocean,with the continuous advancement of marine exploration research,underwater positioning technology as an important research direction has been highly valued by scholars all over the world.Underwater electric field positioning is a novel underwater positioning technology,which can be applied in complex hydrological situations such as visual inefficiency,dim and turbid water with high mechanical background noise.It has the advantages of good concealing performance and the system hardware is very simple.In this paper,the multi-electrode underwater electric field positioning technology is studied,which mainly includes theoretical analysis of underwater electric field positioning,research on multi-electrode underwater electric field positioning algorithm,design and construction of multi-electrode underwater electric field positioning experimental hardware platform.Firstly,the scientific significance and necessity of underwater positioning technology research is elaborated,the development and current status of underwater positioning technology at home and abroad are described.Based on theoretical analysis,the related theory of underwater electric field positioning in two-dimensional and three-dimensional scenes are studied.For different scenes,we established different mathematical models and corresponding positioning methods are proposed.The waveform and frequencies of excitation signals used in the multi-electrode underwater electric field positioning technology is analyzed.This paper proposes a LUT algorithm based on the cosine similarity measure for the two-dimensional multi-electrode underwater positioning scene,and the positioning performance of the algorithm under different electrode configurations is further studied.The algorithm is optimized by using partition index and multi-step search operation and the positioning speed is nearly 19 times faster than the initial algorithm.The method of separating linear parameters and nonlinear parameters is adopted for the three-dimensional multi-electrode underwater positioning scene.And the subspace scanning algorithm is introduced to effectively reduce the complexity of three-dimensional underwater target positioning problem.The multi-step search operation is used to effectively improve the positioning speed,and the positioning performance of the algorithm under different electrode configurations is studied.The advantages of evolutionary programming and particle swarm optimization are combined to form a hybrid particle swarm optimization algorithm for three-dimensional positioning.The hybrid algorithm effectively improves the positioning speed and is highly competitive in terms of accuracy and convergence speed.At the end of this paper,the design and construction of the multi-electrode underwater electric field positioning experimental hardware platform are introduced.In the laboratory environment,the two-dimensional underwater electric field positioning test verification work is carried out.The test results effectively confirm the correctness of the theoretical model and the feasibility of the two-dimensional LUT algorithm applied to underwater electric field positioning.