Partial discharge pulse electric field time domain waveform recovery method and system

The invention discloses a partial discharge pulse electric field time domain waveform recovery method and system. The method comprises the following steps: respectively decomposing a broadband electric field signal and an ultrahigh frequency sensor output voltage signal into a plurality of first sub-band signals and a plurality of second sub-band signals of which the frequency bands are not overlapped; respectively calculating amplitude flatness and group delay flatness of each sub-band signal based on the first sub-band signal and the second sub-band signal; judging whether the ultrahigh frequency sensor is a linear system or not based on the amplitude flatness and the group delay flatness, and obtaining a judgment result; and recovering the time domain waveform according to a preset recovery strategy based on the judgment result. Aiming at the two conditions that whether the transfer function of the UHF sensor is linear or not, the phase is recovered by adopting the minimum phase method under the linear dis