A method for analyzing the transient characteristics of metal dielectric targets by the bouncing ray method of decent division

Abstract

The invention discloses a method for analyzing the transient characteristics of a metal medium target by a bouncing ray method with decent division. The specific steps are as follows: establish the geometric model of the metal medium mixed target, use the tetrahedron element to divide the medium body, and use the triangular element to divide the metal surface to fit the geometric shape of the target; in order to achieve the bouncing ray method The ideal precision is to subdivide the surface triangular unit of the illuminated area; use the ray tube to simulate the propagation of electromagnetic waves in the medium body and the metal surface, and trace the field strength and path of the ray; when the ray leaves the target, calculate the instantaneous time of each ray The state scattering field is accumulated to obtain the total transient scattering signal. The bouncing ray method adopted by the present invention can be used to calculate the transient scattering signal of the submillimeter band electric large-size metal medium mixed target, avoiding the problem of large unknown quantity in the submillimeter band, less time required, and can be obtained by one calculation Wideband RCS.

Description

technical field [0001] The invention belongs to the technical field of microwave measurement, in particular to a method for analyzing the transient characteristics of a metal medium target by a bouncing ray method with decent subdivision. Background technique [0002] In the field of national defense scientific research in our country, the design and simulation of missile systems, the design and appraisal of radar systems, and the research of stealth technology all require the establishment of electromagnetic scattering models of targets (such as aircraft, tanks, etc.) and the environment. In the sub-millimeter wave band, as far as the tank target is concerned, the working wavelength is much smaller than the geometric size of the tank. The electromagnetic scattering in this wave band is high-frequency scattering, and the bouncing ray method is often used, while the previous bouncing ray method can only be used for calculation. For metal targets, the surrounding environment a...

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Problems solved by technology

In the sub-millimeter wave band, as far as the tank target is concerned, the working wavelength is much smaller than the geometric size of the tank. The electromagnetic scattering in this wave band is high-frequency scattering, and the bouncing ray method is often used, while the previous bouncing ray method can only be used for calculation. Metal targets, while the surrounding environment and target coverings are often medium, and the influence of some medium structures on the target on the scattering field is ignored, resulting in a large error between the calculation results and the real results

[0003] When analyzing the electromagnetic characteristics of this metal-medium mixed target, numerical methods such as finite difference time domain (FDTD) and volume area integral equation (VSIE), etc., are often not suitable for radio and television due to the limitation of calculation time and memory requirements. size case

The traditional SBR algorithm is generally used to calculate the electromagnetic properties of metal or thin coating targets. The electromagnetic wave only bounces on the target surface. When the coating is relatively thick, it is no longer applicable.

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