基于功率倒谱的超声测距时延估计方法研究  

Research on Method of TDE in Ultrasonic Distance Measurement Based on Power-Cepstrum

作　　者：苏绍景[1] 程晓畅[1] 王跃科[1] 

机构地区：[1]国防科技大学机电工程与自动化学院仪器系,长沙410073

出　　处：《传感技术学报》2006年第3期836-838,842,共4页Chinese Journal of Sensors and Actuators

摘　　要：基于互相关函数的时延估计方法是脉冲法超声测距中最常用的算法,但窄带超声回波信号的慢衰减高频振荡特性导致它们的相关函数在峰值位置近似作等幅振荡,从而为精确搜索相关函数的峰值带来困难。首先建立了超声测距时延估计模型,然后提出了一种适用于超声测距的基于功率倒谱的时延估计新方法。仿真与实验研究表明,该方法在高信噪比下可以精确得到时延估计值,同时避免了超声回波信号的慢衰减高频振荡特性对时延估计带来的影响。最后对该方法的优点与不足作了说明。Cross-correlation is the common arithmetic in pulse-echo ultrasonic distance measurement. The cross-correlation is high oscillatory with similar amplitudes around the peak because the narrow-band echoes is high oscillatory with slow-changing envelope, so that it becomes difficult to find the actual maximum. Firstly, the TDE （Time Delay Estimation） model in ultrasonic distance measurement is established, and then a novel method appropriate for ultrasonic distance measurement based on power-cepstrum is presented. It is proved by simulation and experiment that we can obtain the TDE value precisely by this method and simultaneously the effect on TDE because of the ultrasonic echo specialty is avoided. Lastly, the strongpoints and deficiencies are interpreted in the article.

关 键 词：互相关函数 功率倒谱 超声测距 时延估计 

分 类 号：TN911.23[电子电信—通信与信息系统] TB551[电子电信—信息与通信工程]