界面反射对窄带信号参数估计影响的仿真研究  

Influence of Interfacial Reflection on Narrowband Signal Parameter Estimation

作　　者：梁国龙[1] 陈晓忠[1] 赵羽 

机构地区：[1]哈尔滨工程大学水声工程学院黑龙江哈尔滨,150001

出　　处：《哈尔滨工程大学学报》2002年第5期24-27,共4页Journal of Harbin Engineering University

基　　金：全国优秀博士论文(199939)基金;高等学校优秀青年教师基金资助项目.

摘　　要：从理论上探讨了界面反射对窄CW脉冲信号载频、时延、包络等参数估计的影响.并在理论分析的基础上,借助于自适应Notch滤波器,针对四种典型的水文条件,给出了界面反射对不同脉宽的窄带信号的包络强度、瞬时频率、瞬时频率方差等参数影响的计算机仿真结果.分析结果表明:界面反射对窄CW脉冲信号的参数估计有重要影响,在工程设计中应采取适当措施加以克服或补偿.本文的分析结果对采用VIFD作为检测器的水声系统的参数设计有参考价值.The influence of multi-path channel on parameter estimation in terms of narrow CW pulse signal is analyzed in the paper. Based on the theoretical analysis, the simulation results of the narrowband signal's envelope, Instantaneous Frequency (IF) and variance of IF in four different velocity profiles are given by means of adaptive Notch filter. It is indicated that the interfacial reflection affects the parameter estimation of narrow CW pulse significantly so that some measures should be taken in practical application. These results are valuable for design of underwater acoustic systems that make use of VIFD as detector.

关 键 词：多途信道 界面反射 参数估计 自适应Notch滤波器 窄CW脉冲信号 水声信道 

分 类 号：TB566[交通运输工程—水声工程]