潜艇模型目标强度的理论分析

THEORETICAL ANALYSIS OF THE TARGET STRENGTH OF A SUBMARINE MODEL

利用复射线展开法,将入射到目标上的声纳波分解为一组复源点波束场入射,利用复射线近轴近似法计算目标局部结构对单个复源点波束场的反射,叠加各复源点场的反射波贡献,便可求出水声目标的反向散射面积,并可由此求出距目标声学中心1m处的目标强度。文中将潜艇散射模型简化为旋转椭球体与椭圆柱体的组合,利用上述方法完成了复射线轨迹追踪和反射声强计算,给出了潜艇模型目标强度随入射方向变化的理论分析结果。

Complex ray expansion is applied to analyze the target strength of a submarine model. The method decomposes the incident sonar wave into a set of complex source point (CSP) fields, calculates then the reflection of each individual CSP beam from the local structure of targets by complex ray paraxial approximation, and superposes all reflection contributions to obtain the backscattering cross section of underwater acoustic targets, as well as the target strength defined at 1 meter distance from the acoustic center. In this paper, a submarine scatter model is simplified as a combination of a rotatory ellipsoid and an elliptic cylinder, the complex ray trajectory tracing and the reflected field computation are finished, and the theoretical results of the target strength of a submarine model versus incident direction are given.