Electromagnetic scattering simulation method based on parallel moment method and physical optics mixing
A technology of physical optics and electromagnetic scattering, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems that the simulation efficiency cannot fully meet the requirements of engineering applications, affect the accuracy of results, and narrow the scope of application, so as to avoid Effects of artificial reflection, reducing calculation time, and improving accuracy
Inactive Publication Date: 2014-06-18
XIDIAN UNIV
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The advantage of the approximation method is that it occupies less memory and has a fast analysis speed. However, the approximation method is based on a specific physical approximation, which has a narrow scope of application and low precision.
Compared with the approximate method, the numerical method can maintain a higher simulation accuracy, but its memory usage is large and the analysis speed is slow
For the complex single-station electromagnetic simulation problem of electrically large-scale rough surfaces and complex targets, the memory requirements of numerical methods are no longer satisfied by the configuration of ordinary personal computers, and the simulation speed is too slow, so it is difficult to extend this type of method to the actual electrically large-scale Composite electromagnetic scattering simulation of rough surfaces and complex targets
The hybrid method can combine the advantages of the high efficiency of the approximation method and the accuracy of the numerical method. When the traditional hybrid method simulates the composite electromagnetic scattering between the rough surface and the target, the plane wave is often used as the incident source. In addition, the simulation efficiency of the traditional hybrid method for the composite electromagnetic scattering of electrically large-sized rough surfaces and complex targets still cannot fully meet the requirements of engineering applications.
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[0032] Embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0033] refer to figure 1 , the implementation steps of the present invention are as follows:
[0034] Step 1: Generate the composite scattering model required for the simulation.
[0035] (1.1) Obtain the rough surface parameters of the simulated ground or sea surface and its power spectral density function S(k) through experiments, for example: for the ground power spectral density function, 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 spatial wavenumber, l is the correlation length, and δ is the root mean square height;
[0036] (1.2) Generate N random numbers conforming to Gaussian distribution, where N is an even number greater than 0;
[0037] (1.3) Input the frequency f of the incident wave, and set the sampling interval △x=3.0×10 8 / (10f), take...
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The invention discloses an electromagnetic scattering simulation method based on parallel moment method and physical optics mixing to mainly solve the problem that when electrically large models are processed in the prior art, the simulation efficiency of electromagnetic scattering and the precision are low. The electromagnetic scattering simulation method comprises the steps that a rough surface power spectrum and rough surface parameters are input, and a rough surface is simulated based on the Monte Carlo method; geometric modeling is carried out on a radar target through 3dsMax software, and the subdivided radar target is output; a combined model is formed by combining the rough surface and the radar target, the rough surface is divided into a physical optics area, and the radar target is divided into a parallel moment method area; induced currents on the rough surface and induced currents on the surface of the radar target are obtained; a far scattered field of the combined model is calculated based on the induced currents on the surface of the combined model, a radar cross section of the combined model is obtained, and simulation between the rough surface and the combined electromagnetic scattering of the radar target is achieved. According to the electromagnetic scattering simulation method, the memory consumption is little, the simulation efficiency is high, and the electromagnetic scattering simulation method can be used in the study on the rough surface and the radar target combined electromagnetic scattering character in the field of national defense and the civil using.
Description
technical field [0001] The invention belongs to the technical field of radar electromagnetic simulation, and relates to an electromagnetic scattering simulation method, which is used for obtaining a composite radar scattering cross section of a target and a rough surface. Background technique [0002] With the rapid development of radar technology, the research on compound electromagnetic scattering of target and rough surface is of great significance in theoretical analysis and practical application. When shore-based, airborne or spaceborne radars conduct electromagnetic detection of targets in various environments such as oceans, deep forests, and deserts, the echo signals received by the radar include not only target information, but also electromagnetic waves from rough backgrounds. scattered signal. By analyzing these echo signals, some characteristics of the detected environment and targets can be obtained. Therefore, the research on the radar scattering characterist...
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IPC IPC(8): G06F17/50
Inventor 郭立新刘蛟常伟王蕊孟肖李科
Owner XIDIAN UNIV
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