Assuming that the autocorrelation sequence shifts from mean A to a+B at time t>0, assuming that the process mean no longer changes, the mean properties of the autocorrelation sequence and residual sequence can be expressed as:
Let the autocorrelation sequence drift from the mean value a to a+B from the moment t>0, and if the process mean value no longer changes, the mean attribute of autocorrelation sequence and residual sequence can be expressed as: