Vehicle EMC diagnosis method and system based on semi-physical simulation

The invention discloses a whole vehicle EMC diagnosis method and system based on semi-physical simulation. The method comprises the steps that a whole vehicle and part model is preprocessed, and a whole vehicle wire harness path is extracted; carrying out meshing processing on the whole vehicle model to obtain a whole vehicle grid model; acquiring a common-mode interference current I of a whole vehicle wire harness path, port voltage U of each part, equivalent port impedance ZS of an interference source and equivalent port impedance ZR of common parts; establishing an antenna model at a preset distance of the whole vehicle grid model, and calculating a scattering coefficient S, an interference source port equivalent voltage VS and a receiving voltage Uant by taking I as an excitation signal; calibrating a receiving antenna to obtain a magnetic field antenna coefficient AFH and an electric field antenna coefficient AFE; and S is converted into a parameter Z, the contribution value of the interference source to