Engine cavity radar scattering characteristic determination method

The invention belongs to the technical field of engine radar scattering characteristic simulation design, and particularly relates to an engine cavity radar scattering characteristic determination method. The method comprises the steps of S1, obtaining the equivalent induction current density on the inner cavity wall of an engine cavity; S2, constructing a BP neural network, in the BP neural network, constructing a performance index function based on the difference between the rated current density and the actual output current density, correcting the weight coefficient of the network according to a gradient descent method, and optimizing the number of iterations of the equivalent induction current density; and S3, performing iteration on the current density according to the number of iterations to obtain a scattered field of the induced current in the backward radar. According to the method, automatic optimization judgment is carried out on the number of iterations of the physical optical method in a neural