Rough surface and target composite electromagnetic scattering simulation method based on reciprocity principle
A technology of composite electromagnetic and simulation methods, applied in the field of radar, can solve the problems of reducing the accuracy of simulation methods, limiting the versatility of simulation methods and the scope of engineering applications, and achieving the effects of avoiding artificial reflections, high versatility, and improving simulation efficiency
Active Publication Date: 2014-02-19
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 reciprocity principle, mainly solving problems of low simulation efficiency, poor simulation universality and high memory requirements in the prior art. The rough surface and target composite electromagnetic scattering simulation method based on the reciprocity principle is implemented by the steps of (1) generating the rough surface by the Monte Carlo method according to the power spectrum density function of the rough surface, (2) performing geometric modeling to the target according the size and shape requirements of the target, (3) adding the geometric model of the target into a rough surface model to generate a composite model, (4) calculating a direct scattered field by means of Kirchhoff approximation, (5) acquiring a coupling field between the rough surface and the target according to the reciprocity principle, (6) calculating the total scatted field of the composite model according the direct scatted field and the coupling field, and (7) acquiring monostatic radar scatted parameter of the composite model according the total scattered field and an incident field of the composite model. The rough surface and target composite electromagnetic scattering simulation method based on the reciprocity principle has the advantages of high simulation speed, simulation precision and universality, and can be applied to target detection in the background of the rough surface.
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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