In order to accurately identify the characteristic information of the rectangular pulse signal

the relationship between the amplitude

initial phase

spectral component and duty ratio of the harmonic component of the pulse signal is studied. Based on the Fourier series expansion of the continuous periodic rectangular pulse signal

the functional relationship between the duty ratio and the amplitude of the harmonic component

the duty ratio and the initial phase of the harmonic component are derived

by constructing simulation circuit model

correlation between duty ratio and harmonic signal amplitude

duty ratio and initial phase of harmonic signal is simulated and analyzed by Multisim software

and their relationship curves are measured by simulation. The results show that the signal duty ratio is consistent with the theoretical analysis and simulation results of function relationship of characteristic information

that is

under the premise of the amplitude and frequency of the periodic rectangular pulse signal are fixed

amplitude and initial phase of the harmonic component are functions of duty ratio. Using the functional relationship and law between the duty ratio and the harmonic amplitude and the duty ratio and the initial phase value

the characteristic information of pulse signal can be identified.