论文部分内容阅读
为了研究随机信号的统计特性,以幅度、宽度两个相对独立的特征参数为基本概念,建立随机信号的双参数脉冲模型.采用PCI-9812高速数据采集卡,对空气中悬浮颗粒随机性光散射脉冲信号、光电传感器本底噪声随机信号进行计数分布的统计分析.实验结果表明,随机性脉冲信号幅度、宽度子集的计数分布以很高的精度与以自然数为自变量的对数正态分布符合;进一步的计算结果表明,在脉冲信号幅度、宽度定义域内,随机脉冲信号集合的两个特征参数之间存在非线性变换关系,即随机信号的双参数统计分布具有非整数维分形特征.
In order to study the statistical characteristics of random signals, a two-parameter impulsive model of random signals is established based on the basic concepts of amplitude and width, two relatively independent characteristic parameters.The PCI-9812 high-speed data acquisition card is used to analyze the stochastic light scattering Pulse signal and the random noise signal of the photoelectric sensor are statistically analyzed.The experimental results show that the counting distribution of the amplitude and width subsets of random pulse signal is highly accurate and the logarithm normal distribution with natural number as the independent variable The results show that there is a non-linear transformation between the two characteristic parameters of the random pulse signal set in the range of pulse signal width and width. That is, the two-parameter statistical distribution of random signal has non-integer fractal characteristics.