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.
出处
《传感技术学报》
EI
CAS
CSCD
北大核心
2006年第3期836-838,842,共4页
Chinese Journal of Sensors and Actuators
关键词
互相关函数
功率倒谱
超声测距
时延估计
cross-correlation
power-cepstrum
ultrasonic distance measurement
time delay estimation
