Simulation of Echoes from Surface Ship Based on Highlight Model

The simulation of the amplitude factor of the echo for traditional highlight models varies inaccurately with azimuth angle, and the established echo highlight model only considers the scenario where the target and torpedo are at the same horizontal plane, without considering the situation where the torpedo is positioned below the target at a large elevation angle. In this paper, the boundary element method is adopted to calculate the azimuthal variation of the target strength for different elevation angles of the surface ship's overall underwater portion and three highlight parts (bow, hull, and stern). Based on this, the echo simulation of the surface ship at all azimuth angles is realized based on the highlight model, constructing a three-highlight surface ship echo model. Compared with the traditional highlight model, it establishes a highlight model of the surface ship echo at large elevation angles, which is closer to the actual scenario of torpedo attacking surface ships, and more accurately simulates the fluctuations of the amplitude factors of the target echo highlights. It better solves the problem of echo model's distortion caused by occlusion effects between highlights. From the simulation results, this model can more accurately simulate the basic characteristics of active sonar echoes, and has important theoretical significance and practical application value in the field of surface ship echo analysis.