1. A method of detecting transient signals in a power spectrum comprising a measured signal and noise, the method comprising the steps of: generating a power spectrum from the measured signal and noise; determining, from the power spectrum, peaks in the power spectrum; generating at least one histogram of moments for peaks in the power spectrum; normalizing the at least one histogram of the moments by its area to produce a measured Probability Density Function (PDF); comparing a difference between the measured PDF with a predetermined PDF to determine if a signal is present.