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Planet surface irregular grid three-dimensional geometric modeling method

A modeling method and 3D geometric technology, applied in 3D modeling, image enhancement, instrumentation, etc., to solve problems such as the inability to directly apply scattering and imaging characteristic analysis, the limited radar resolution of elevation data models, and the neglect of surface microstructures. , to achieve the effect of improved scattering calculation efficiency, simple and easy operation, and smooth boundary area

Active Publication Date: 2021-04-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The regular elevation data model is limited by the radar resolution, the unit grid size is large, and the surface microstructure is ignored, so it cannot be directly applied to the analysis of scattering and imaging characteristics
[0007] (2) There are differences between the terrain modeling technology based on statistical data and the real complex terrain, resulting in inaccurate scattering calculations;

Method used

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  • Planet surface irregular grid three-dimensional geometric modeling method
  • Planet surface irregular grid three-dimensional geometric modeling method
  • Planet surface irregular grid three-dimensional geometric modeling method

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Embodiment 1: Mars local topography;

[0056] Such as Figure 5 As shown, the coordinate system is added to the original regular elevation grid model, and Monte Carlo is used to superimpose the random roughness with root mean square height δ=0.65cm and correlation length l=10cm, according to the grid number-threshold curve and image similarity-threshold Curve, the optimal threshold is 0.5, to generate the local optimal irregular grid model of Mars. Scattering simulations were performed on the regular rough grid model and the irregularly subdivided grid model in the figure, and the RCS-angle change curve was calculated. The results are as follows Figure 6 Shown, among them, frequency f=3GHz, dielectric parameter ε=3.8+i0.1140. Detailed results regarding the number of grids, calculation time and coherence coefficient of the curves are listed in the following table:

[0057] Table 1 Comparison of calculation results between the irregular grid model and the regular mode...

Embodiment 2

[0060] Embodiment 2: volcano topography;

[0061] Figure 7 A 6m*6m*0.06m rough (root mean square height δ=0.65cm, correlation length l=10cm) regular grid model of volcanic peaks and a schematic diagram after irregular subdivision are shown, and a diagram suitable for traditional PO calculation (subdivision according to 1 / 8λ) regular grid model. Under the conditions of frequency f=3GHz and dielectric parameter ε=2.9+i 0.0812, use our algorithm to calculate the RCS curve of the grid model after irregular subdivision and import the regular grid model suitable for traditional PO calculation into The results calculated by the commercial software FEKO are compared, and the comparison results are as follows Figure 8 shown. The detailed data are shown in the table below:

[0062] Table 2 Comparison of Calculation Results Between Irregular Grid Model and Regular Model of Volcanic Topography

[0063]

[0064] Under the condition of 3GHz incident frequency, the traditional PO i...

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Abstract

The invention discloses a planet surface irregular grid three-dimensional geometric modeling method, which is suitable for terrain scattering and imaging simulation of super-electric large rough media, and comprises the following steps of: superposing surface micro-roughness by taking measurement regular grid data of a planet surface as an initial value and adopting a Monte-Carlo method, taking a height gradient as a basis for judging terrain fluctuation, and selecting a threshold value; dividing a terrain steep region and a terrain flat region, respectively carrying out grid encryption and sparseness, carrying out computer identification on grids at joints of different regions by adopting an expansion corrosion algorithm, eliminating minimum points, and generating an irregular grid model by combining a smooth boundary with a Delaunay triangulation algorithm. Compared with a regular subdivision grid model, the number of irregular grids can be reduced by 90%, and the model precision reaches up to 0.99; and scattering and imaging simulation of the super-electric large terrain are facilitated.

Description

technical field [0001] The invention relates to the technical field of planetary radar remote sensing, in particular to a three-dimensional geometric modeling method with irregular grids on the planet's surface. Background technique [0002] The geometric modeling of 3D planetary terrain is the basis for the study of scattering characteristics. Usually, the surface topography of a planet is complex, with a large number of large-scale undulating structures such as craters, volcanic peaks, and sand dunes, as well as small and medium-scale terrain micro-rough structures, such as figure 2 shown. At present, regular grid elevation digital model (DEM) is often used to obtain the geometric structure of real terrain. DEM is represented by regular grid elevation points and is suitable for describing large-scale continuous terrain surfaces. Several commonly used elevation databases include SRTM X-band data of DLR (German Aerospace Center), SRTM and GDEM elevation databases of NASA ...

Claims

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Application Information

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IPC IPC(8): G06T17/05G06T17/20G06T5/30G06T5/00
Inventor 牟媛郭琨毅盛新庆周文雅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY