EMD-based signal denoising in EMP measurement system

To remove the interference of strong environmental noise, fiber-optic transmission system is usually used in the measurement of electromagnetic pulse (EMP). However, due to the thermo-noise in fiber optic emitting and receiving circuits, there are still some inevitable noise in the transmission system. This effect limits the use of the EMP measurement system in shielded enclosures. An improved signal denoising method based on empirical mode decomposition (EMD) to enhance the signal-to-noise ratio (SNR) in EMP measurement has been proposed. The method we proposed is validated through simulation and real EMP experiments data, and it, compared to other approach, has better stability in the case of signals with lower initial SNR (-2 to 5 dB). The dynamic range of fiber-optic transmission system raised about 20 dB.