Regional decomposition method for analyzing electromagnetic characteristics of multiple high-speed motion rotational symmetry targets

A high-speed motion, rotationally symmetric technology, applied in complex mathematical operations, design optimization/simulation, CAD numerical modeling, etc., can solve problems such as reduced efficiency, low efficiency of dynamic target electromagnetic characteristics modeling, and no consideration of accelerated calculation methods.

Active Publication Date: 2020-07-28
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, for the modeling of multiple moving targets, static discretization is not a simple multi-right vector problem. The discrete matrix equation changes with the relative position of multiple targets in space, and the efficiency of traditional broadband and wide-angle calculation methods will be significantly reduced.
Rotationally symmetric moment method (M.Jiang, Y.Li, Z.Rong, L.Lei, Y.Chen, and J.Hu, "Fast solving scattering from multiple bodies of revolution with arbitrarily metallic-dielectric combinations," IEEETrans.Antennas Propag., vol.67, no.7, pp.4748-4755, Jul.2019) can realize the modeling of electromagnetic characteristics of metal and medium mixed static targets, and the decomposition of the rotationally symmetrical equivalent surface area is not considered in the modeling Accelerated calculation method, low efficiency for modeling electromagnetic properties of dynamic targets

Method used

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  • Regional decomposition method for analyzing electromagnetic characteristics of multiple high-speed motion rotational symmetry targets
  • Regional decomposition method for analyzing electromagnetic characteristics of multiple high-speed motion rotational symmetry targets
  • Regional decomposition method for analyzing electromagnetic characteristics of multiple high-speed motion rotational symmetry targets

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Embodiment

[0084] Figure 4 is the target running along three trajectories, the curve equation of trajectory 1 is y 1 =1 / 10z 1 2 , the curve equation of trajectory 2 is y 2 =1 / 12z 2 2 , the curve equation of trajectory 3 is y 3 =1 / 12z 3 2 , the target speed is 100m / s. Metal targets move along tracks 1 and 2, and medium targets move along track 3, and the relative dielectric parameter is ε r = 2.0. The target is a cone, the diameter and height of the bottom surface are 0.5m and 0.95m, the incident wave frequency is 1GHz, and the incident angle is (θ=0°, φ=0°). Table 1 shows the precession parameters of the three targets moving along the trajectory, θ c and θ d are the precession angles of metal and medium targets, respectively. Such as Figure 5 As shown, the two-station RCS under the four precession angle states are calculated respectively. It can be found that with the increase of the precession angle, the range of RCS curve jitter gradually increases, and this characteris...

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Abstract

The invention discloses a regional decomposition method for analyzing electromagnetic characteristics of multiple high-speed motion rotational symmetry targets. The method comprises the following steps: discretizing a high-speed motion multi-target motion track into static moments according to motion time, and respectively carrying out electromagnetic calculation and analysis at each static moment; at any static moment, establishing an equivalent spherical surface for each target, wherein the diameter of each equivalent spherical surface is the sum of the maximum size of the target and 0.4-1.0incident wave wavelength; calculating a transmission matrix between the scattering matrix from the target to the equivalent spherical surface and the equivalent surface; wherein the multiple targetsare in a near-field coupling area, and the total scattered field solution considers the coupling effect among the multiple target equivalent surfaces; wherein the multiple targets are in a far-field area, and the total scattering field is the superposition of all equivalent surface scattering fields; and calculating the time-varying radar scattering cross-sectional area and the radar image of themoving target by using the total scattering field. The method has the advantages of simple programming realization and high calculation efficiency, and realizes high-efficiency electromagnetic characteristic analysis of a plurality of high-speed moving targets.

Description

technical field [0001] The invention relates to the technical field of numerical calculation of electromagnetic characteristics of moving targets, in particular to a region decomposition method for analyzing the electromagnetic characteristics of multiple high-speed moving rotationally symmetrical targets. Background technique [0002] When the moving speed of the target is comparable to the speed of light, relative boundary conditions are widely used in electromagnetic calculation methods to model the electromagnetic characteristics of moving targets. The relative space-time and electromagnetic transformation based on the time-domain integral equation method was proposed to calculate the electromagnetic characteristics of moving targets (S.Q.Jia, X.M.Jiang, and M.Y.Xia, “Numerical approach for analysis of transient scattering by an accelerated body,” J. Electromagn. Waves Appl., vol.26, nos.5–6, pp.770–782, 2012). [0003] The calculation of the electromagnetic characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/16G06F111/10
CPCG06F17/16
Inventor 李猛猛陈如山丁大志樊振宏胡燕萌房欣宇章羽晨曦杨天
Owner NANJING UNIV OF SCI & TECH
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