Time domain integral equation method for analyzing electromagnetic scattering characteristic of hypersonic flight object

Abstract

The invention discloses a time domain integral equation method for analyzing the electromagnetic scattering characteristic of a hypersonic flight object. The time domain integral equation method comprises that a time domain volume-surface integral equation is established; according to the structural scattering characteristic, the total electric field on the stimulated object is equal to the sum of an incident electric field and a scattered electric field, and the incident electric field is stimulated; the integral equation is discretized, tests in space and time are carried out, and a time domain matrix equation is established; the relationship between the dielectric flux density and the electric field intensity of plasma is established; and the time domain matrix equation is solved, and the electromagnetic scattering characteristic of a mixed object in broadband is analyzed. According to the invention, only the object model needs to be discretized, by means of a free space green function and a recursive convolution method, a mixed object containing heterogeneous plasma medium and metal can be analyzed, the calculating precision is high, and the number of unknowns is relatively small; at the same time, a time domain method is employed for solution, the electromagnetic scattering characteristic of each frequency point in broadband can be calculated for one step, compared with a frequency domain method that frequency sweep operation is needed, the time domain integral equation method is advantaged in that the solving time is reduced.

Description

a technical field [0001] The invention belongs to the technical field of analyzing the electromagnetic scattering characteristics of a metal plasma mixed target, in particular to a time-domain integral equation method for analyzing the electromagnetic scattering characteristics of a hypersonic flying target. 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. Carrying out research on the electromagnetic characteristics of hypersonic targets in near space can provide technical support for the effective detection of hypersonic aircraft and weapon penetration in near space. Due to the high flight speed (above Mach 5) and high flight altitude (above 20Km) of a hypersonic flight target, friction with the air during flight will generate aerodynamic heat of several thousand degrees Celsius, which will ionize the surrounding air and form ions. state exi...

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.JiaoandJ.-M.Jin, "A general approach for the stability analysis of the time-domain finite-element method for electromagnetic simulations," IEEE Trans. Antennas Propag., vol.50, no.11, pp.1624–1632, Nov.2002.), requires the setting of boundary conditions, and there are relatively many discrete unknowns, and the accuracy is limited Great limitations, unable to meet the increasing need 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.

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