噪声背景下的信号检测是一项复杂而又重要的任务，在雷达信号检测和通信领域都是重要的课题。在低信噪比情况下与普通自相关函数法进行了比较。给出了时域及频域(Signal detection in noisy background is a complex and important task. It is an important topic in the field of radar signal detection and communication. Compared with the general autocorrelation function method, the signal to noise ratio is low. The time domain and frequency domain are given.)