Linear relation discrimination method and system of ultrahigh frequency partial discharge sensing system function

The invention discloses a linear relation discrimination method and system for an ultrahigh frequency partial discharge sensing system function. The linear relation discrimination 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 carrying out noise judgment on each first sub-band signal and each second sub-band signal, and removing the first sub-band signals and the second sub-band signals which are determined to be noise; calculating amplitude flatness and group delay flatness corresponding to the transfer function in each effective sub-band according to the remaining first sub-band signal and the second sub-band signal; and according to the amplitude flatness and the group delay flatness corresponding to the transfer function in each effective sub-band, determi