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在立靶测量系统中,针对弹丸作用光幕时探测电路输出信号的不一致,导致传统的弹头触发和弹尾触发方式提取光幕时间值存在较大的测时误差问题,提出了利用计算机采集光电探测靶的输出信号,采用小波变换模极大值方法,检测弹丸穿越光幕时产生的信号突变点奇异位置,计算信号突变起始点之间的采样点数,结合采集系统的采样率,推算出弹丸作用于光幕间的时间值。根据四光幕交汇的测量原理,分析各光幕间的时间值与立靶坐标的关系。基于小波变换理论,分析小波变换模极大值检测弹丸信号奇异位置的原理,研究立靶测量系统的时间计算算法。在4 m×4 m的靶面,采用小波分析方法计算的坐标值与传统方法计算的坐标值与纸靶对比,平均误差值减小近6 mm。结果表明:小波分析法具有明显的优越性,提高了立靶测量系统的测量精度。
In the vertical target measurement system, the inconsistency of the output signal of the detection circuit when the projectile acts as a light curtain causes the time error of the light curtain to be extracted by the traditional bullet trigger and the tail-trigger mode, and the problem of time-measurement error is proposed. Detection of the target output signal, the use of wavelet transform modulus maxima method to detect the projectile through the light curtain signal mutation point singular position, calculate the signal mutation starting point between the sampling points, combined with the sampling rate of the acquisition system, calculate the projectile Effect on the time between light curtains. According to the measuring principle of intersection of four light curtains, the relationship between the time value of each light curtain and the coordinates of the target is analyzed. Based on the theory of wavelet transform, the principle of detecting the singular position of projectile signal by modulus maxima of wavelet transform is analyzed, and the algorithm of time calculation of target measurement system is studied. In the 4 m × 4 m target, the average value of the error calculated by the wavelet analysis method and the traditional method is less than 6 mm. The results show that the wavelet analysis method has obvious advantages and improves the measurement accuracy of the vertical target measurement system.