基于简正波理论的浅海低频混响时间序列仿真

混响场时域信号序列的数值实现对主动声纳目标模拟器研制具有重要意义。本文所述适用于水平变化浅海环境混响时间序列的一种实现方法,基于现有的浅海简正波相干混响理论。所述方法的思路是通过相干散射场随机序列与发射信号的离散卷积来构成混响时域序列,文中以Pekeris均匀浅海环境为例,给出了相应的混响时间序列仿真结果,并对仿真结果的频谱特性、统计特性、强度衰减以及垂直相关特性等进行了系统检验。结果表明,由仿真混响时间序列所获得的混响特性与理论结果相符,可用于浅海混响序列的仿真。

Realization of low frequency reverberation sequence in shallow water based on normal-mode theory

Numerical realization of reverberation time sequence is very important for active sonar simulation. Based on the existing shallow-water coherent reverberation model, a simulation method for low frequency reverberation time sequence in time domain is proposed. The reverberation sequence is realized through discrete convolution of scattering field and emitting signals. The simulation result under Pekeris waveguide is given and the characteristics of reverberation spectrum, statistics, reverberation loss level and vertical correlation are tested through numerical examples. It is shown that the simulation results are in accordance with the theoretical analysis. This method could be used for shallow-water reverberation simulation.