Time domain Nystrom method for analyzing transient electromagnetic scattering characteristics of metal and media mixed target

Abstract

The invention discloses a time domain Nystrom method for analyzing transient electromagnetic scattering characteristics of a metal and media mixed target. For the metal and media mixed target, the transient electromagnetic scattering characteristics can be analyzed by employing a time domain volume-surface integral equation method. Compared with a conventional time domain volume-surface integral equation method based on an RWG (Vector Triangular) basis function and an SWG (Standard Wire Gauge) basis function, the time domain volume-surface integral equation method based on a high-order Nystrom method is capable of analyzing the transient electromagnetic scattering characteristics of the metal and media mixed target more flexibly. In the method, dielectric constants of media are defined at interpolation points in a discrete curved tetrahedron unit, thus electromagnetic parameters in a discrete unit are described more exactly. In addition, the method has the advantage of robustness for discrete grids, that is the discrete grids can be non-conformal.

Description

technical field [0001] The invention belongs to the time-domain volume area integral equation method for analyzing the transient electromagnetic scattering characteristics of metal medium mixed targets, specifically the time domain analysis method for the transient electromagnetic scattering characteristics of metal medium mixed targets method. Background technique [0002] Acquisition and analysis of target electromagnetic scattering characteristics is a very important research field in electromagnetic problems. Electromagnetic scattering waves of targets are the information sources of many applications such as radar detection, remote sensing observation and geological survey. Quantitative analysis of scattering characteristics is the key to these application systems. The main basis when designing and working. The physical quantities such as the shape and volume of the radar target are calculated by calculating the parameters such as the radar cross section, and the radar...

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Problems solved by technology

However, when the traditional time-domain volume integral equation method based on RWG and SWG basis functions analyzes a mixed target containing highly inhomogeneous coal quality, in order to describe the electromagnetic parameter characteristics of the coal quality in the mixed target more accurately, it is necessary to discretize the medium body The tetrahedral mesh of the very dense

Moreover, the traditional time-domain volume integral equation method requires discrete grid conformality, which greatly limits the application of this method in some practical problems

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