混响空时二维特性产生原理及仿真实现
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摘要
混响是声呐主动工作方式下的特有干扰.由水体反射产生的混响多普勒频率与入射角之间具有解析的函数关系,即为空时二维特性.文中通过推导,给出了混响空时二维特性的解析表达式,理论分析了不同声呐基阵布置方式和不同俯仰角下的的空时二维特性分布规律.并通过对水体散射情况进行建模,仿真得到运动载体平台接收到的混响空时二维特性分布情况.仿真结果对理论分析进行了验证,展示了实际混响二维特性的分布规律.
Reverberation is a special interference in sonar active working mode.The reverberation Doppler frequency produced by water reflection has an analytical functional relationship with the incident angle,which is the space-time two-dimensional characteristic.Through derivation,the analytical expression of space-time two-dimensional characteristics of reverberation was given,and the distribution law of space-time two-dimensional characteristics under different sonar array arrangements and different pitch angles was analyzed.By modeling the scattering of water body,the space-time two-dimensional characteristic distribution of reverberation received by the moving carrier platform was simulated.The simulation results verify the theoretical analysis and show the distribution of the two-dimensional characteristics of the actual reverberation,which is of great significance to the use of spacetime method to suppress reverberation.
Reverberation is a special interference in sonar active working mode.The reverberation Doppler frequency produced by water reflection has an analytical functional relationship with the incident angle,which is the space-time two-dimensional characteristic.Through derivation,the analytical expression of space-time two-dimensional characteristics of reverberation was given,and the distribution law of space-time two-dimensional characteristics under different sonar array arrangements and different pitch angles was analyzed.By modeling the scattering of water body,the space-time two-dimensional characteristic distribution of reverberation received by the moving carrier platform was simulated.The simulation results verify the theoretical analysis and show the distribution of the two-dimensional characteristics of the actual reverberation,which is of great significance to the use of spacetime method to suppress reverberation.
引文
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[7]詹昊可.主动声呐混响空时抑制方法研究[D].武汉:海军工程大学,2010.
[8]夏雪.参数自适应匹配滤波算法及其混响抑制研究[D].武汉:海军工程大学,2014.
[2]王永良,彭应宁.空时自适应信号处理[M].北京:清华大学出版社,2000.
[3]范西昆.机载雷达空时自适应处理算法及其实时实现问题研究[D].长沙:国防科学技术大学,2006.
[4]KLEMM R.Principle of space-time adaptive processing[M].London:Institution of Electrical Engineers,2002.
[5] KLEMM R.Applications of space-time adaptive processing[M].London:Institution of Electrical Engineers,2004.
[6]赵申东.主动声呐空时自适应处理方法研究[D].武汉:海军工程大学,2008.
[7]詹昊可.主动声呐混响空时抑制方法研究[D].武汉:海军工程大学,2010.
[8]夏雪.参数自适应匹配滤波算法及其混响抑制研究[D].武汉:海军工程大学,2014.