Research on the electromagnetic environment of ships based on the high frequency algorithm

Research on the electromagnetic environment on ships that are mounted with many electric sys-tems and equipment are of vital importance on improving the electromagnetic compatibility and protectioncapability. First,the physical theory of diffraction(PTD)algorithm is verified with simplified models, whichcan be used to calculate the target shaded area and edge diffraction field when calculating the scatteredfield. Then,the physical optics(PO)and PTD are combined to calculate the field around the ship illuminat-ed by electromagnetic waves. Next,the results are compared to the MIL-STD-461 C standard, and the haz-ard areas of the ship are estimated, revealing that the superstructure is the major hazard area. Finally, the raytracing from the source to the view point beside the mast is obtained with the method of geometrical theory ofdiffraction(GTD),which successfully explains the potential threat of superstructures: the electromagneticwave that impinges on the structure of the ship will be repeatedly reflected. In brief, the combination of a va-riety of algorithms for the studying of the ship electromagnetic compatibility has a great significance.