时频分析及曲线拟合在引信信号检波中的应用

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

为了实现引信炸点的选择和控制,提高引战配合性能,提出了结合短时傅里叶变换以及曲线拟合估计理论提取回波信号中有效信息的方法。该方法采用短时傅里叶变换对电磁引信回波信号进行包络解调,并利用3次多项式对包络曲线拟合,大大抑制了原曲线中存在的噪声,突出了信号在时频域上的特征,能够精确估计出雷目交汇最近点时刻。仿真结果表明,该方法估计精度高。

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.