Effect of unequal rise and fall times on the autocorrelation function of a PN sequence

The rise and fall times of a pseudo-noise (PN) waveform are of concern in a short-range, CW radar such as a missile fuse radar. An inequality creates a spurious pair of sidelobes and a spiky ripple on the sidelobes of the autocorrelation function, which may cause false alarms in the radar. Analytical expressions are presented which relate the spurious responses of the autocorrelation function to the waveform rise and fall times.