| Since 1990's, several regional conflict such as the Persian Gulf War, the Bosnia War and the Afghanistan War had happened and indicated that advanced electronic warfare is the key point to the modern war. And it is known that radar countermeasures will become more and more important. In order to provide the database for radar countermeasures, we researched the electro-magnetic property of the aero-craft and turbulent flow field based on the numerical of them.First, we generated the surface grid of aero-craft using the finite iteration method of the elliptic equation, estimated the aero-craft's Radar cross section (RCS) in high frequency area by the physical optics.Then, analyzed the profile's influence on RCS.With some reasonable result is presented in this paper,the computation program can be used as pre-estimating and optimizing of the future weapon system, reducing their RCS, shorting the operation distance of the enemy's radar fence, improving the penetration and the viability of our weapon.Second, to satisfy the research of the electro-magnetic property of non-dispersive and nonabsorbent turbulent flow field, we had set up a model and the computation program based on finite difference time domain (FDTD) method, and the result was perfect to relative studies.Further more, it can be applicated to research the electro-magnetic property of the mixing layer in time sequence computed by Large-Eddy Simulation (LES) method.
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