引言我们知道,要从噪声中检测出信号就要求有一定的信噪比 S/N。由于噪声的随机性质,使“有信号”这一事件呈现一定的概率。就雷达型导引头而言,所谓检测出信号,是指在规定的发现概率 P_D 和虚警概率P_(fa)的条件下,信号处理器输入端的信噪比不小于一个最小量 min(S/N),用符号表示,则有 Introduction We know that to detect a signal from noise requires a certain S / N ratio. Due to the random nature of the noise, there is a certain probability of a “signal” event. For the radar seeker, the signal detected means that the signal-to-noise ratio at the input end of the signal processor is not less than a minimum amount min (S (n)) under the condition of the predetermined probability of finding P_D and the probability of false alarm P_ / N), with the symbol that there