在计算海底混响信号时,根据混响产生的物理机理,以射线声学为基础,用Lambert散射定律计算海底反向散射强度,采用单元散射模型建立海底混响信号模型。利用GPU相比于CPU具有更高的浮点运算能力和内存带宽的特点,采用GPU进行计算海底混响信号。通过对仿真混响信号的处理分析,在散射点较少时,混响信号包络更接近于K分布,而随着散射点的增多,混响信号的包络接近于瑞利分布。符合混响信号的一般统计特性。该方法能快速仿真出混响信号,达到高效的目的,为以后混响信号的实时演示验证提供一条可供选择的途径。
According to the physical process of reverberation and the theory of ray acoustics, calculation of sea bottom back scattering intensity with Lambert scattering law is carried out and a model of reverberation signal model is set up by using the cell scattering model. Because GPU has a higher floating-point computing performance and memory bandwidth compared to CPU, fast calculation of the reverberation signal simulate is achieved by using GPU. The results show that the envelope of the reverberation signal is more close to the K distribution with few scatter points and it is close to the Rayleigh distribution with the increase of scattered points which is accord with general statistical characteristics of reverberation signal.
2016,38(6): 128-131 收稿日期：2015-12-14
DOI：10.3404/j.issn.1672-7619.2016.06.026
分类号：TB566
作者简介：李利(1985-),女,硕士,工程师,主要从事舰船噪声测量与分析及水声信号处理方面的工作。
参考文献：
[1] 姚万军, 蔡志明. 浅海混响的建模与预报[J]. 海军工程大学学报, 2009, 21(2):88-91, 112.
[2] 袁骏, 肖卉, 张明敏, 等. 双基地声呐海底混响面元划分与建模[J]. 探测与控制学报, 2009, 31(4):1-4.
[3] 张明辉. 三维环境海洋混响强度衰减规律研究[D]. 哈尔滨:哈尔滨工程大学, 2005:5-7.
[4] 方世良. 海洋混响信号的序贯仿真[J]. 声学技术, 1996, 15(3):101-104.
[5] ABRAHAM D A, LYONS A P. Reverberation envelope statistics and their dependence on sonar bandwidth and scattering patch size[J]. IEEE journal of Oceanic Engineering, 2004, 29(1):126-137.
[6] ABRAHAM D A, LYONS A P. Simulation of non-rayleigh reverberation and clutter[J]. IEEE Journal of Oceanic Engineering, 2004, 29(2):347-362.
[7] 蔡平, 梁国龙, 葛凤翔, 等. 界面混响信号的仿真研究[J]. 哈尔滨工程大学学报, 2000, 21(4):31-35.
[8] 陈文剑, 孙辉, 朱建军, 等. 基于分数阶傅里叶变换混响抑制的目标回波检测方法[J]. 声学学报, 2009, 34(5):408-415.
[9] 郭熙业, 苏绍璟, 王跃科. 海底混响统计建模与仿真方法研究[J]. 兵工学报, 2009, 30(7):940-944.
[10] 郭熙业, 苏绍璟, 王跃科. 基于射线理论的海底混响建模研究[J]. 声学技术, 2009, 28(3):203-207.
[11] 姚万军, 蔡志明. 基于简正波的浅海混响序列仿真[J]. 声学技术, 2009, 28(1):25-28.
[12] 姚万军, 蔡志明, 卫红凯. 浅海混响建模的声束跟踪理论[J]. 声学学报, 2009, 34(3):223-228.
[13] ZHANG M H, SUN H, CHEN W J. Simulation model of bottom reverberation signals for horizontal bistatic receiving array[C]//Proceedings of 2008 IEEE International ultrasonics symposium. Beijing:IEEE, 2008:1437-1440.
[14] ABRAHAM D A, LYONS A P. Exponential scattering and K-distributed reverberation[C]//Proceedings of 2001 MTS/IEEE Conference and Exhibition. Honolulu, HI:IEEE, 2001, 3:1622-1628.
