Method for analyzing transient characteristics of metal medium target by body-surface division shooting and bouncing ray method

Abstract

The invention discloses a method for analyzing transient characteristics of a metal medium target by a body-surface division shooting and bouncing ray method. The method includes the following concrete steps: establishing a geometric model of a metal medium mixed target, carrying out body division on a medium body by using a tetrahedron unit, and carrying out surface division on a metal surface by using a triangular unit to fit a geometric shape of the target; subdividing the surface triangular unit of an illuminated area in order to achieve ideal precision of the shooting and bouncing ray method; simulating propagation of electromagnetic waves in the medium body and on the metal surface by using a ray tube to track field strength and a path of rays; and when the rays leave the target, calculating transient scattering fields of all the rays and accumulating the transient scattering fields to obtain a total transient scattering signal. The shooting and bouncing ray method of body-surface division used by the invention can be used for calculating the transient scattering signal of the large-size metal medium mixed target of a sub-millimeter wave band, which avoids the problem of large unknown quantity of the sub-millimeter wave band, requires less time and can obtain a broadband RCS by one calculation.

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...

AI Technical Summary

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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