目 录
中文摘要
ABSTRACT
第一章 绪 论 ................................................................................................................ 1
§1.1 超声信号处理的难题和对策 ....................................................................................... 1
§1.2 超声体模 KS107BD ....................................................................................................... 2
§1.3 传统动态滤波器方法 .................................................................................................... 3
§1.4 主要工作和意义 ............................................................................................................. 4
第二章 自适应滤波器原理 ............................................................................................ 5
§2.1 维纳滤波器原理[9] .......................................................................................................... 5
§2.2 自适应滤波器原理 ......................................................................................................... 7
§2.2.1 牛顿法 ........................................................................................................................ 9
§2.2.2 最陡下降法 ............................................................................................................... 9
§2.4 归一化最小均方误差(Normalized least-mean-square, NLMS) ......................... 11
§2.5 自适应滤波器的应用 .................................................................................................. 12
§2.5.1 系统识别 ................................................................................................................. 12
§2.5.2 信号增强 ................................................................................................................. 13
§2.5.3 信号预测 ................................................................................................................. 13
§2.5.4 通道均衡 ................................................................................................................. 13
§2.6 自适应滤波器效果的评价指标 ................................................................................ 14
第三章 仿真实验 .......................................................................................................... 16
§3.1 仿真信号和目标参数 .................................................................................................. 16
§3.1.1 仿真信号的确定 ................................................................................................... 16
§3.1.2 目标参数 ................................................................................................................. 18
§3.2 仿真实验[21] .................................................................................................................... 19
§3.2.1 近似平稳信号(散射回波)仿真实验 ........................................................... 19
§3.2.2 非平稳信号(界面反射)仿真实验 ............................................................... 20
§3.2.3 参数确定 ................................................................................................................. 23
§3.2.4 合成信号仿真实验 ............................................................................................... 24
第四章 实际效果 .......................................................................................................... 26
§4.1 B 超扫描和数据采集 ................................................................................................... 26