基于频域幅度谱数据重建电磁脉冲时域波形

 由频域幅度谱数据重建时域脉冲波形，是电磁脉冲效应及传感器标定研究中经常遇到的问题。根据最小相位原理，利用倒谱技术，编程实现了从频域幅度谱数据构造相位信息，进而反演时域脉冲响应波形。对几类函数波形和一组实测高空核爆电磁脉冲(HEMP)波形的验证结果表明，HEMP波形、余(正)弦阻尼振荡波形等信号的重建波形与原始波形符合很好。对于非最小相位信号，重建波形的前(后)沿、峰值等细节参数有一定差别，但也能给出一些波形、累积能量、幅值量级等方面的标志信息。

Reconstruction of electromagnetic pulse waveform based on the amplitude spectrum data

Measured CW amplitude spectrum data are often obtained in EMP research, especially in effects experiments and probe calibration. This paper investigates the minimum phase reconstruction of the transient waveform from amplitude spectrum data. This technique involves the use of Hilbert transform, an assumption of minimum phase and cepstrum. The reconstruction of minimum phase signal, such as the HEMP waveform, cosine or sine exponentially damped waveform etc, shows good agreement with the original. For non-minimum phase signal, the total energy, the approximate amplitude and shape of the waveform can be indicated although the rise (fall) time and peak value are different from the original.