Introduction - If you have any usage issues, please Google them yourself
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.