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Composite scattering joint calculation method of bidirectional reflection distribution function and scattering center

A bidirectional reflection distribution and calculation method technology, applied in the field of electromagnetic scattering characteristics research, can solve problems such as reducing the efficiency of electromagnetic scattering simulation of superelectric large composite targets, achieve the effects of reducing constraints, reducing the number of grids, and improving calculation efficiency

Active Publication Date: 2021-04-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Application Information

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Problems solved by technology

At the same time, there are still a large number of complex integral iterations in the existing hybrid algorithm, which seriously reduces the simulation efficiency of electromagnetic scattering of superelectric large composite targets

Method used

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  • Composite scattering joint calculation method of bidirectional reflection distribution function and scattering center
  • Composite scattering joint calculation method of bidirectional reflection distribution function and scattering center
  • Composite scattering joint calculation method of bidirectional reflection distribution function and scattering center

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Experimental program
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Effect test

Embodiment 1

[0080] Embodiment one: destroyer-sea surface model;

[0081] The present invention establishes the destroyer target CAD model such as figure 2 As shown, the destroyer is 145 meters long, with a maximum width of 21 meters left and right, and a maximum height of 25 meters. figure 1 As shown; the sea surface size is 200×200 meters for the third-class sea surface, the wind speed is 8.5 knots / s, and the dielectric parameter is 71+i50, such as image 3 shown;

[0082] When modeling the target, the Figure 4 In (a) and (b) the maximum similarity sum Figure 5 The minimum root mean square error is the objective function, and the parameters are cyclically estimated until the accuracy requirements are met. At a frequency of 100M, the final modeling result is that the RCS root mean square error is 3.98db, and the time-frequency image similarity is 92%. The target scattering echo required for the final SAR imaging is obtained by frequency-dependent correction; Figure 7 As shown, th...

Embodiment 2

[0084] Embodiment two: tank-road surface model;

[0085] The present invention establishes the tank target CAD model such as Figure 12As shown, the front and rear length of the tank is 7.9 meters, of which the body length is 6.2 meters, the barrel length is 4 meters, the width is 3.56 meters, and the height is 1.9 meters, of which the body height is 1.4 meters. When the pitch angle is 40 degrees, the track and tires of the car body cannot be seen due to the blocking of the baffle, so they will not be considered in the modeling; the road surface is a cement road surface with a length of 100 meters and a width of 10 meters, with a width of 5 meters on each side The composition of the bare soil, and its geometric parameters are shown in the table below.

[0086] Types of Dielectric parameters root mean square height correlation length cement 5 0.12cm 1.14cm bare soil 7.6+i0.2 1.1cm 6.8cm

[0087] The modeling results of the BRDF model of...

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Abstract

The invention discloses a composite scattering joint calculation method of a bidirectional reflection distribution function and a scattering center. Rapid and efficient calculation of scattering echoes and SAR image simulation of an ultra-electric large-size composite scene are realized. Echo of a composite scene is divided into three parts, and an attribute scattering center (ASC) is adopted to fit scattering echo of an independent target; the method further includes fitting scattering echoes of the rough background by using a BRDF-based surface element model (BRDFFBM); fitting multiple scattering components of the target and the background by using a four-path model; according to the invention, a parameterized model is used, complex scattering echo integral operation is expressed by a simple mathematical algebraic expression, and the unknown quantity of the parameterized expression is estimated by a genetic algorithm (GA). According to the method, the calculation efficiency is greatly improved, the calculation speed is improved by tens of thousands of times compared with a multi-layer fast multipole algorithm (MLFMM), and meanwhile the RCS error is smaller than 4 db. According to the invention, the problem of rapid calculation of scattering and imaging of the super-electric large composite target is solved.

Description

technical field [0001] The invention relates to the technical field of research on electromagnetic scattering characteristics, in particular to a combined calculation method for compound scattering of a bidirectional reflection distribution function and a scattering center. Background technique [0002] Radar echo prediction is a forward problem in the study of electromagnetic scattering, and it has a wide range of applications in image interpretation, target guidance and target recognition. With the development of new synthetic aperture radar (SAR) technology, it is more and more important to simulate more realistic echoes with higher efficiency. Therefore, rapid modeling of composite scene echo has received great attention. The current numerical algorithms for echo scattering in complex scenes include method of moments (MoM), finite element method (FEM) and finite difference time domain method (FTDT). In order to further improve the computational efficiency, parallel alg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 盛新庆牟媛张尊郭琨毅杨明林
Owner BEIJING INSTITUTE OF TECHNOLOGYGY