Method for obtaining coating target broadband RCS based on rational interpolation method

The invention discloses a method for obtaining the broadband RCS of a coating target based on a rational interpolation method, and the method comprises the implementation steps: carrying out the subdivision of an external medium surface and an internal metal surface of the coating target through a triangulation method, and defining an RWG primary function; sampling the frequency band of the broadband uniform plane wave irradiating the coating target at equal intervals; establishing an EFIE-PMCHW equation set on the target surface of each sampling frequency point, and solving the EFIE-PMCHW equation set by using a moment method; utilizing a rational function interpolation method to obtain an induced electromagnetic current coefficient at each frequency sweeping point; and obtaining the coating target broadband RCS through the electromagnetic current coefficient of each frequency sweeping point. According to the method, the RCS result of any frequency sweeping point on the broadband can be approximately solved