A Region Decomposition Method for Analyzing Electromagnetic Properties of Multiple High-speed Moving Rotationally Symmetrical Targets
A technology of rotational symmetry and area decomposition, applied in complex mathematical operations, design optimization/simulation, CAD numerical modeling, etc., can solve problems such as reduced efficiency, no consideration of accelerated calculation methods, and low efficiency of modeling electromagnetic characteristics of dynamic targets. Achieve the effect of simplifying modeling difficulty and improving calculation efficiency
Active Publication Date: 2021-09-21
NANJING UNIV OF SCI & TECH
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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
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[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 both 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. like 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 character...
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The invention discloses an area decomposition method for analyzing the electromagnetic properties of multiple high-speed moving rotationally symmetrical targets. The method is as follows: according to the movement time, the trajectory of high-speed moving multi-targets is discretized into static moments, and electromagnetic calculation and analysis are performed at each static moment; at any static moment, each target is respectively established as an equivalent spherical surface, and its diameter is The maximum size of the target plus 0.4 to 1.0 wavelength of the incident wave; calculate the scattering matrix from the target to the equivalent spherical surface and the transmission matrix between the equivalent surface; between multiple targets in the near-field coupling area, the total scattering field solution considers multiple The coupling effect between target equivalent surfaces; in the far field area between multiple targets, the total scattering field is the superposition of the scattering fields of each equivalent surface; using the total scattering field, calculate the time-varying radar scattering cross-sectional area and radar image. The invention has the advantages of simple programming and high calculation efficiency, and realizes high-efficiency analysis of electromagnetic characteristics of multiple 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...
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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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