Time domain integral equation method for analyzing plasma electromagnetic scattering properties

Abstract

The invention discloses a time domain integral equation method for analyzing plasma electromagnetic scattering properties. The method analyzes electromagnetic scattering properties of a chromatic dispersion plasma model through a time domain integral equation. According to the method, a discrete object model is needed only, a free space green function and a recursive convolution method are used, electromagnetic scattering properties of an inhomogeneous chromatic dispersion plasma target can be analyzed, and compared with a finite difference time domain method and a time domain finite element method both needing total space discretization, the method provided by the invention has very high calculation accuracy and relatively less unknown quantity; meanwhile, since the time domain method is used for solving, electromagnetic scattering properties of each frequency point of broadband can be calculated one time, and compared with a frequency domain method needing a frequency sweeping operation, the method provided by the invention consumes greatly reduced time for solving.

Description

a technical field [0001] The invention belongs to the technical field of simulation calculation for rapid calculation of electromagnetic scattering characteristics of plasma media in a wide frequency band, in particular to a time-domain integral equation method for analyzing plasma electromagnetic scattering characteristics. Two background technology [0002] In modern warfare, the radar cross section (RCS) of a weapon system is an important indicator of the "observability" of a radar system to a target. Due to the high flight speed (above Mach 5) and high flight altitude (above 20Km), the hypersonic flight target will generate aerodynamic heat of several thousand degrees Celsius when it is in flight, and the air around it will be ionized and become The ionic state exists. When the degree of ionization reaches a certain level, the ionized gas has plasma properties. At this time, the enveloping flow field near the surface of the flying target is usually called plasma envelo...

AI Technical Summary

Problems solved by technology

Compared with other time-domain methods, the time-domain volume integral equation method can accurately and effectively analyze the transient electromagnetic scattering problem, while the traditional time-domain methods, such as the finite-difference time-domain method (FDTD) (J.A.Pereda, L.A.Vielva, A .Vegas, and A. Prieto, "State-space approach for the fdtd formulation for dispersive media," IEEE Trans. Magn., 1995, 31(3):1602–1605) and time-domain finite element method (D. Jiao and J.-M. Jin, "A general approach for the stability analysis of the time-domain finite- elementmethodforelectromagneticsimulations, "IEEETrans.AntennasPropag., vol.50, no.11, pp.1624–1632, Nov.2002.), the accuracy is greatly limited, and radiation boundary conditions are required, and there are relatively many discrete unknowns. Cannot meet the increasing demand for high precision

In the frequency domain method, the impedance matrix of each frequency point is different, and the calculation of the electromagnetic characteristics of a frequency band must be swept, and the frequency sweep in the frequency domain is very time-consuming and deviates from the actual needs.

Images