对于门限电平的设置，常常用到虚警概率，但是恒虚警是根据电平的变化来设置虚警概率。-Threshold levels for the settings, usually used for false alarm probability, but CFAR is based on changes in level to set the false alarm probability.

利用正弦信号作为发射信号，分别在AWGN和瑞利信道中，计算CR中的检测概率和虚警概率，并绘图。-Sinusoidal signal as transmitted signal, respectively, in AWGN and Rayleigh channel, calculate the probability of detection and false alarm probability of CR and drawing.