在激光打靶实验过程中会产生电磁脉冲(EMP)信号，测量这些电磁脉冲信号所使用的电场探头输出信号多数为微分信号，需要进行积分后才能得到测量结果。模拟积分器由于带宽限制，不能满足测量要求，需通过数字积分器完成积分。本文基于小波变换与傅里叶变换对数字积分器进行设计，采用小波软阈值法与低频去零漂法对微分信号中高频随机噪声及零漂误差进行处理。经过研究分析，可对上升时间小于100?ns的电磁脉冲信号进行积分，并取得较好的效果。

Electro Magnetic Pulse(EMP) signals are generated in laser shooting experiment. The output signals of electric field probe utilized to measure these EMP signals are differential signals, which need to be integrated before the measurement results can be obtained. Because of the bandwidth limitation，analog integrator cannot meet the measurement requirements, the integration can be completed only through digital integrator. In this paper, the digital integrator is designed based on the wavelet transform and Fourier transform. The wavelet soft threshold method and the low frequency zero drift removal method are adopted to deal with the high frequency random noise and zero drift error of differential signals. After research and analysis, it can integrate the EMP signals whose rise time is less than 100?ns, and has achieved good results.