Visual tracing scattering analysis method of inhomogeneous medium

Abstract

The invention discloses an efficient calculation method of a radar scattering cross section of an inhomogeneous medium wrapped target. The method comprises the following steps: firstly equalizing the inhomogeneous medium into a layered homogeneous medium according to electromagnetic parameters; setting up a lighting model and selecting a three-dimensional viewpoint in an OpenGL (open graphics library) and inputting the three parts of information into a graph hardware processor; accomplishing the automatic shielding of a three-dimensional target by using the graph hardware processor; outputting a real-time target image and visible pixel information displayed on a computer screen after the automatic shielding, wherein the visible pixel information includes brightness values (R,G,B) and three-dimensional coordinates (x,y,z) of pixels; displaying medium interfaces at which rays arrive layer by layer in the OpenGL according to the direction of incident electromagnetic waves; extracting the brightness and the coordinate information of the pixels; determining the reflection and refraction of the rays by combination of the electromagnetic parameters at two sides of the interface, so as to trace the direction of the rays and determine the incidence direction of incidence electromagnetic waves of the pixels of the target when the rays arrives at a target body; in a loss medium, synchronously calculating the attenuation of each ray on a transmission journey; and finally, calculating the radar scattering cross section of the inhomogeneous medium wrapped target according to integrals of a physical optical field and a boundary diffraction field. The method has the advantages that a novel method for calculating radar scattering characteristics of the inhomogeneous medium based on graphic display is provided, so that the defects that in a traditional calculation method, a large-sized medium cannot be calculated, and control in manual mode is difficulty are overcome.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a non-uniform medium visual tracking scattering analysis method, which is mainly applied to the analysis of electromagnetic scattering characteristics of large-scale non-uniform medium-coated targets. Background technique [0002] For the analysis of the electromagnetic properties of inhomogeneous media, most domestic and foreign scholars mainly focus on the scattering characteristics of one-dimensional and two-dimensional plasmas, and the analysis methods used mainly adopt classical analytical methods. In recent years, some scholars have introduced the current more popular The numerical algorithm-FDTD method for scattering simulation of plasma-coated targets, besides few other numerical simulation methods. [0003] FDTD method, as a common method for analyzing time-varying electromagnetic fields at present, has its unique advantages in solving problems such as inhomogeneous media...

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