任意形状海底的混响谱模型及仿真  

Reverberation Spectra Modeling and Simulation of Arbitrary Sea Bottom Shape

作　　者：黄晓燕[1] 冯西安[1] 高天德[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《系统仿真学报》2014年第11期2576-2580,共5页Journal of System Simulation

基　　金：国家自然科学基金(61271414)

摘　　要：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 main interference of active sonar system. The sea bottom modeling often regards the bottom as fiat surface, but in practical, sea bottom is irregularity. So, it is not accurate to simply regard the bottom as flat surface to modeling. In order to solve this problem, arbitrary bottom reverberation spectrum model was built and the model simplified calculation method was simulated. Sea bottom was divided into grid for the different Doppler frequency of different gird cell. Using surface equation to describe the bottom shape and Newton iteration method to work out the arbitrary point coordinates, according to the relative position relations and azimuth information between bottom cell and moving platform to calculate the reverberation of different Doppler cell by convolution with transmit signal energy spectrum, the arbitrary bottom reverberation spectrum was obtained. The simulation results of two kinds of sea bottom shape reverberation spectrum agree with theory analysis.

关 键 词：任意海底混响谱 运动谱 曲面海底 混响谱模型 

分 类 号：TN911[电子电信—通信与信息系统]