On the Parameter Estimation of Sinusoidal Signal

This paper utilizes FFT after undersampling to analyze the relationship between the estimation of sinusoidal parameters and corresponding actual values on the basis of bandpass sampling theorem. In addition, the errors of parameter estimation using phase difference are deduced strictly. Investigation indicates that the error of frequency estimation is proportional to the sampling rate, while that of initial phase independent of it. The results of computer simulation show the validity of academic conclusions.