Extended Application Of GRECO And Its Visual Integration

The radar cross section (RCS) is a major parameter for describing thecharacteristics of radar target, and how to obtain the RCS is a very important researchtopic. Lots of software is used to compute the RCS of general targets. However, they donot meet the requirements of the real-time calculation under the constraints ofcomputing resource and computation time for aircraft, warships and so on.Graphical electromagnetic computing (GRECO) uses software such as AutoCADdirectly to build the precise target model. In addition combining OpenGL technology,we can translate the source shape data of targets displayed on the computer screen to thedata for RCS computing. Utilizing computer graphics and GPUs for detecting andmeshing visible facets, GRECO is regarded as one of the most perspective method forcomputing complex target scattering characteristics in the high-frequency region withthe characteristics of real-time calculations and high precision.This paper is based on the method of GRECO to calculate the RCS of complextarget in high frequency region, The RCS of targets are obtained through PhysicalOptics (PO) and Incremental Length Diffraction Coefficients (ILDC) respectively.General GRECO compares the vector of pixel with the adjacent one to get the edgeinformation of the complex targets, this approach will result in missing the edges. In ourpaper, we get the edge information through the geometric information, this method hasmuch virtue, such as high detection and complete information for edges. Theidentification of edges especially for large complex targets is time-consumed, so we putforward a speedup method, which is based on binary space-partitioning, to acceleratethe speed of detecting edges.The RCS of targets coated with Radar Absorbing Material (RAM) in thehigh-frequency region have been further studied. The RCS of targets coated RAM wasresolved by combining GRECO with Impedance Boundary Condition (IBC). It hasgreat significance for stealth technology and anti-stealth technology. Meanwhile,GRECO can supply the information of target scattering field for ISAR imaging, whichcan help us to get the imaging results of electrically large targets easily and quickly.Finally, the software’s frame and the technologies of visualization are introduced, whichmake computing results more pellucid.