Pipeline leakage filtering method and system based on automatic variational mode decomposition

The invention discloses a pipeline leakage filtering method, a pipeline leakage detection method and a pipeline leakage detection system based on automatic variational mode decomposition, relates to the technical field of pipeline leakage detection, and is used for solving the problem that the detection precision is reduced because a pipeline leakage signal is interfered by noise. The filtering method comprises the following steps: on the basis of variational mode decomposition, adding a constraint criterion by using the concept of a residual signal to construct an automatic variational mode decomposition objective function, so as to obtain a formula for updating a mode and a center frequency; proposing an updating bandwidth formula and an iteration condition for automatically searching a target modulus by using a modal power concept; and reconstructing the obtained pure mode by using the Lee's distance so as to achieve the purpose of de-noising. The detection method comprises the following steps: filtering a