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混响是主动声呐系统特有的干扰,通常将海底看作平面进行建模,而实际的海底是凹凸不平的,单纯将海底看作平面建模是不准确的。根据海底混响形成机理从理论上推导建立了任意形状海底混响谱模型及其仿真的简化计算方法。针对不同海底单元多普勒频率扩展不同,将海底进行网格划分。采用曲面方程表示海底形状,通过牛顿迭代算法给出曲面方程任意点的位置坐标,根据海底单元与运动平台的相对位置关系和方位信息计算不同多普勒单元的混响大小与发射信号能量谱卷积得到任意海底混响谱。对两种不同形状海底混响谱的进行了计算机仿真,仿真结果与理论分析相符。
Reverberation is the unique interference of an active sonar system. Usually, the sea floor is modeled as a plane. However, the actual sea floor is uneven. It is inaccurate to simply consider the sea floor as a plane. According to the formation mechanism of seabed reverberation, a simplified method for calculating the shape of reverberation spectrum of arbitrary shape and its simulation is deduced theoretically. In view of the different Doppler frequency expansion of different seafloor units, the seafloor is meshed. Surface shape is used to represent the shape of the seafloor. The position coordinates of any point of the surface equation are given by Newton’s iterative algorithm. Based on the relative position and azimuth information between the submarine unit and the moving platform, the reverberation sizes of different Doppler units and the energy spectrum Get any seafloor reverb spectrum. The computer simulations of two different shapes of seafloor reverberation spectrum are carried out. The simulation results are consistent with the theoretical analysis.