Applications of Time-frequency Analysis and Curve Fitting to Fuze Signal Detection

A method for extracting effective information in the echo signal based on the short-time Fourier transform and the theory of curve fitting for estimation is put forward in order to realize the fuze burst point selection and control and to improve the performance of fuze warhead coordination. The method demodulates electromagnetic fuze echo signal envelope by using short-time Fourier transform, and fits the envelope curve by using three times of polynomial, which greatly suppresses the noise in the original curve and highlights the characteristics of the signal in frequency domain. Thus, the nearest time point of torpedo-target intersection can be accurately estimated. Simulation results show that the proposed method has higher estimation precision.