A New Underwater Acoustic Imaging Technology Based On Pulsed Sound Source

In recent years,with the increasingly fierce competition for ocean rights and interests in various countries around the world,the strategic position of the ocean has become increasingly prominent.As the top priority of ocean detection technology,underwater acoustic imaging technology has become increasingly urgent.However,the traditional underwater acoustic imaging technology has a series of shortcomings such as high equipment cost and low detection efficiency,especially in some areas(such as military target detection,underwater search and rescue,etc.)that cannot meet the needs of actual operations.Aiming at this situation,this paper creatively proposes an underwater acoustic imaging scheme that uses a non-directional pulsed sound source as the transmitting sound source.Using the high energy,low cost,and omnidirectional radiation characteristics of the pulsed sound source,it overcomes the shortcomings of the "directional" transceiver mechanism in the traditional underwater acoustic imaging system,and has the advantages of low equipment cost and high detection efficiency.For this technical solution,this paper focuses on two key technical elements in the solution: underwater acoustic sensing technology and underwater acoustic imaging algorithm.In the underwater acoustic sensing technology,this paper focuses on exploring a laser remote acoustic sensing technology based on the laser Doppler effect,which solves the low detection efficiency of traditional contact underwater acoustic sensing technology and the insufficient flexibility of equipment use.problem.In this paper,the mathematical principle and implementation scheme of the technology are described in detail,and the feasibility of using the technology to obtain underwater acoustic signals is verified through practical experiments.In the underwater acoustic imaging algorithm,this paper proposes an acoustic wave back projection imaging algorithm based on body image segmentation.This algorithm can realize the rapid reconstruction of the target area through multiple inversion analysis of the echo signal,which meets the algorithm requirements of the "non-directional" detection system of the overall imaging scheme.In this paper,the algorithm is discussed in detail from the perspectives of basic principle derivation and specific implementation process.In the algorithm implementation details,two delay estimation algorithms,the correlation threshold method and the amplitude threshold method,are proposed.In addition,this paper also verified the feasibility of the imaging algorithm by designing and implementing simulation experiments and actual experiments,explored the impact of threshold changes on the imaging effect,and the relevant factors that affect the imaging quality of the algorithm in practical applications are analyzed.