Simulation Method of Compound Electromagnetic Scattering Between Rough Surface and Target Based on Reciprocity Principle
A technology of composite electromagnetic and simulation methods, applied in the field of radar, can solve the problems of limiting the versatility and engineering application range of simulation methods, reducing the accuracy of simulation methods, etc., and achieve the effects of avoiding artificial reflection, improving accuracy and high versatility
Active Publication Date: 2016-06-29
XIDIAN UNIV
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When using the reciprocity principle combined with the approximation method to simulate the composite electromagnetic scattering between the rough surface and the target, the plane wave is often used as the incident source, which will form artificial reflections at both ends of the finite rough surface, which reduces the accuracy of the simulation method. Spend
Moreover, when using the existing reciprocity principle combined with the approximation method to simulate the composite problem, the target shape is fixed, so that the simulation method can only be applied to the composite electromagnetic scattering problem of a rough surface and a specific shape target, which limits the simulation. Method versatility and scope of engineering application
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[0025] refer to figure 1 , the specific implementation steps of the present invention are as follows:
[0026] Step 1: Generate the composite model required for the simulation.
[0027] (1.1) Obtain the rough surface parameters of the simulated ground or sea surface and its power spectral density function S(k) through experiments, where the rough surface parameters include root mean square height δ and correlation length l. For different types of rough surfaces, the power spectral density function S(k) has different forms, for example: for the ground power spectral density function is S(k)=2πδexp(-k 2 / δ 2 ) / l 2 , for the sea surface power spectral density function S(k)=δ 2 l / [π(1+k 2 l 2 )], k is the space wave number;
[0028] (1.2) Generate N random numbers conforming to Gaussian distribution, where N is an even number greater than 0;
[0029] (1.3) Input the frequency f of the incident wave, with Δx=3.0×10 8 / (10f) is the sampling interval, take N discrete samplin...
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The invention discloses a rough surface and target composite electromagnetic scattering simulation method based on the principle of reciprocity, which mainly solves the problems of low simulation efficiency, weak simulation universality and high memory requirement in the prior art. The implementation steps are: (1) according to the power spectral density function of the rough surface, the rough surface is generated by the Monte Carlo method; (2) according to the size and shape requirements of the target, the geometric modeling of the target is carried out; (3) the geometric model of the target is Add the rough surface model to generate a composite model; (4) use the Kirchhoff approximation method to calculate the direct scattering field; (5) obtain the coupling field between the rough surface and the target according to the principle of reciprocity; (6) obtain the coupling field between the rough surface and the target according to the direct scattering field and coupling field to calculate the total scattering field of the composite model; (7) Obtain the monostatic radar scattering parameters of the composite model according to the total scattering field and the incident field of the composite model. The invention has the advantages of fast simulation speed, high simulation precision and strong universality of the simulation method, and can be used for target detection in rough surface background.
Description
technical field [0001] The invention belongs to the technical field of radar, and mainly relates to an electromagnetic scattering numerical simulation method, which is used for obtaining the parameters of the composite monostatic radar scattering of a rough surface and a target. Background technique [0002] With the rapid development of radar technology, the research on compound single-station electromagnetic scattering of rough surface and target is of great significance in both theoretical analysis and practical application. When the airborne or spaceborne radar conducts electromagnetic detection on the target in the rough background such as the ground and sea surface, the echo signal of the radar contains not only the information of the target but also the electromagnetic scattering signal of the rough background. By analyzing these echoes Signal, and then can get the rough surface and some characteristics of the detection target. Therefore, the research on the composit...
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IPC IPC(8): G06F17/50
Inventor 郭立新柴水荣王蕊徐润汶魏仪文
Owner XIDIAN UNIV
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