基于小波的激光测速靶的信号分析

激光靶是一种子弹发射速度测量系统,它根据子弹穿过两个靶面的时间间隔以及两靶间的距离算出子弹的平均速度.介绍了一种应用小波变换分析激光靶过靶信号的算法,该算法从大尺度到小尺度沿着模极大线确定信号奇异点的位置,从而判断出子弹的过靶时刻.由于在大尺度上噪声的小波变换系数的幅值比信号的小波变换系数的幅值小,该算法能有效抑制噪声的影响.实验结果表明:应用小波分析激光靶的信号提高了测量的精度和可靠性.

Signal Analysis of Laser Screen System Using Wavelet

Laser screen is a velocity measurement system for projected bullets.The average velocity is worked out based on the time during which the bullet passes through two screens and the distance between the two screens.An algorithm for processing the signal of the laswr screen system using wavelet was introduced.Searching along wavelet transform maxima lines from large scale to small scale the singularity point of the signal was discriminated.So the time of the bullet passing through the target was obtained.Because the amplitude of wavelet coefficients of noise was smaller than that of the signal,the influence of noise could be decreased.Experimental results show that the proposed algorithm makes measurement more precise and reliable.