非平坦地形双基地海底混响的快速计算方法改进  

Improved fast calculation of non-flat bistatic bottom reverberation

作　　者：关承宇 周泽民 曾新吾[1] GUAN Chengyu;ZHOU Zemin;ZENG Xinwu(College of Meteorology and Oceanology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学气象海洋学院

出　　处：《国防科技大学学报》2019年第6期175-183,共9页Journal of National University of Defense Technology

基　　金：国防科研基金资助项目(3101287);国防科技大学科研计划资助项目(JC15-11-01)

摘　　要：针对传统双基地海底混响的计算量问题,对该类海底混响的理论计算模型进行了改进,利用基于Lambert散射法则的闭型表达式和基于曲线拟合的数值计算方法,实现了对任意地形双基地海底混响的快速计算。基于该方法,对不同变化规则的非平坦海底双基地混响进行了仿真分析,并讨论了周期和非周期的非平坦海底环境下,地形拟合步长对信混比计算精度的影响。仿真结果表明:该方法能够快速计算得到复杂海底地形的信混比空间分布。相比经典单元散射混响模型,所提出的双基地海底混响计算改进方法可以大幅提高计算效率,同时在合理的海底地形拟合步长前提下兼顾计算结果的精度。The calculation model for bottom reverberation was improved with the closed-form formulas based on Lambert′s law and the numerical computation method of curve fitting, in order to solve the problem of traditional bistatic bottom reverberation. Different forms of non-flat bottom were designed and their bistatic reverberation were researched. The influence of fitting steps on the computational accuracy of signal-to-reverberation-ratio was also discussed in the situation of periodic or aperiodic non-flat bottom. The simulation showed that the proposed method can quickly get the signal-to-reverberation-ratio of complex bottom terrain when the fitting step is appropriate. Compared with the classical elemental scattering model, the developed model can improve the computational efficiency greatly, while simultaneously keeping the accuracy.

关 键 词：双基地海底混响 信混比 曲线拟合 Lambert法则 非平坦地形 

分 类 号：TN95[电子电信—信号与信息处理]