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取样显示方法是一种显示重复性毫微秒级快速脉冲的有效方法。采用此法可将决速信号变换为速度减慢很多倍而仍然具有原有信息量的信号,然后进行放大和显示。对周期性信号取样显示的简单,方框如图1。近年来了解到取样变换过程可以压低噪声,发现被淹没在噪声中的信号。Мамырин和Вол曾对取样过程中可能得到的信噪比提高倍数进行了计算,但他们都把取样脉冲宽度中的噪声认为是一个随机变数,而实际并不如此简单。Атуфрнев等的实验所给出的结果只是定性的,不能从中得出定量的结论。我们考虑到取样脉冲宽度中噪声是一个随机过程这一事实,推导出具有普遍性的公式;并结合实际情况,在噪声频带为一定宽度时,较精确地计算了信噪比提高倍数;还进一步对缩短取样后低频信号周期、提高观察效率提出了具体的方法。
The sample display method is an effective way to display fast pulses in the nanosecond range of repeatability. Using this method, the velocity-determining signal can be transformed into a signal that is many times slower and still has the original amount of information, then magnified and displayed. Sampling periodic signals shows the simple box shown in Figure 1. In recent years, it has been learned that the sample conversion process can suppress noise and find signals submerged in the noise. Мамырин and Вол have calculated possible multiples of the signal-to-noise ratio in the sampling process, but they all consider the noise in the sampling pulse width as a random variable, which is actually not that simple. The results given by Атуфрнев and other experiments are only qualitative and can not be drawn quantitative conclusions. Considering the fact that the noise in sampling pulse width is a random process, we derive a universal formula. When the noise band is a certain width, we can calculate the multiplication ratio of signal to noise ratio more accurately. To shorten the sampling of the low-frequency signal period, to improve the efficiency of the proposed specific method.