摘要
针对超声检测中现有超声回波参数估计方法实用性低的问题,改进超声回波信号预处理方法,缩减了数据处理量。采用超声回波高斯模型和最大期望(EM)算法,不仅改善了EM算法的缺点,提高了EM算法的收敛速度,而且提高了参数估计精度。数字仿真与应用实验结果均表明:所提方法在保证检测精度的基础上,提高了运算速度和算法的实用性。
Aiming at problem of low practicality of existing uhrasonic echo parameter estimation method for uhrasonic detection, improve preprocessing for ultrasonic echo signal and reduce the amount of data processing, an improved method is proposed based on Gauss model for ultrasonic echo and expectation maximization （EM） algorithm. The new algorithm can not only overcome shortcoming and improve convergence speed of EM algorithm, hut also achieve a higher precision. Numerical simulation and application experiment are carried out to verify effectiveness of the method. Simulation and experimental result shows that the proposed method can not only ensure the detection precision but also improve computing speed and practicality of algorithm.
作者
孔亚广
张旭
KONG Ya-guang;ZHANG Xu(School of Automation,Hangzhou Dianzi University,Hangzhou 310018,China)
出处
《传感器与微系统》
CSCD
2018年第7期151-154,共4页
Transducer and Microsystem Technologies
关键词
超声检测
参数估计
最大期望算法
信号处理
实用性
ultrasonic detection
parameters estimation
expectation maximization （ EM ） algorithm
signal processing
practicality
