原信号s1为正弦信号，原信号s2为频率相同的另一正弦信号；

对s1、s2分别加噪声n1、n2得到信号x、y；

对加有噪声的x做自相关函数估计原信号；

对加有噪声的x、y做互相关函数估计原叠加信号。-The original signal s1 is a sinusoidal signal, the original signal s2 is another sinusoidal signal with the same frequency

On s1, s2 were added noise n1, n2 get the signal x, y

Adding the noise to the x to do the autocorrelation function to estimate the original signal

For the addition of noise x, y do cross-correlation function to estimate the original superposition signal.