Multi-beam Imagiing Sonar Simulation And Imaging Analysis

Underwater multi-beam imaging technology which can visually and vividly display the observation area and underwater targets through two-dimensional or three-dimensional image forms has been widely developed in the field of ocean research.It has not only high resolution,but also real-time imaging while detecting targets.The principle of underwater multi-beam imaging determines the performance and design of imaging sonar,so the research of multi-beam imaging sonar simulation system is of great significance.The purpose of this paper is to establish a multi-beam imaging simulation system to explore the influence of different parameters on sonar images,and focus on the influence of beamforming on multi-beam sonar.The research contents include:1.The concept of underwater multi-beam imaging principle,the display mode of the sonar image and the sector transformation are studied.2.The most common beamforming of three multibeam imaging sonars,such as phase shift beamforming,time delay beamforming,and DFT beamforming,has been studied.The analysis of virtual array element beamforming based on least squares and linear prediction is carried out,and the principle of focused beamforming is analyzed.This paper proposes a virtual array element beamforming with stronger anti-interference ability,and compares the performance of the method.3.The target echo model of distributed scattering model is studied.The multi-beam imaging simulation system is established by using the principle of distributed scattering model.The modules of the simulation system are introduced.Finally,the software interaction interface of the multi-beam imaging simulation system is designed.4.The seabed and spherical targets are modeled and then imaged according to the echo model.The multi-beam imaging sonar simulation system is used to explore the influence of different factors on imaging sonar,and finally the valuable rules are summarized.