Research on Near-Field High-frequency Echo Strength Characteristics of Small Undersea Vehicle

In response to the need for detecting and identifying small undersea vehicles, modeling and simulation research have been conducted on the high-frequency echo strength characteristics of small undersea vehicles in the near field. This article used the plate element method to calculate and analyze the near-field echo strength of a cylindrical undersea vehicle and presented the spatial distribution characteristics of the echo strength. On this basis, a pool test was conducted to compare the consistency and variation characteristics of the measured results and simulation results. The results show that the simulation results and pool test results are consistent in spatial distribution trends, with strong echo strength at the head end face and transverse azimuth of the small undersea vehicle, and the high-frequency echo strength characteristics of the small undersea vehicle in the near field exhibits a butterfly-like distribution.