Method and device for determining a radar cross section, method for training an interaction model, and radar target emulator and test facility

A method for determining a radar cross section of a simulated radar target, comprising:

• simulating a propagation of a virtual radar signal on the basis of an interaction model in a simulated environment scenario which contains the simulated radar target, wherein an interaction of the virtual radar signal with the simulated radar target is modeled such that a physical variable characterizing the virtual radar signal is divided into a directional component corresponding to a directed scattering of the virtual radar signal and a diffuse component corresponding to an isotropic scattering of the virtual radar signal, wherein the propagation of the directional component of the virtual radar signal is simulated in a sub-step and the interaction of the directional component with a further simulated radar target is calculated in a subsequent sub-step;
• determining a value of the physical variable at a receiver point in the simulated environment scenario factoring in the directional component and the diffuse component;
• and
• deriving the radar cross section of the simulated radar target from the determined value of the physical variable at the receiver point.