CN112767550B - Space target light scattering characteristic modeling method based on grid - Google Patents
Space target light scattering characteristic modeling method based on grid Download PDFInfo
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- CN112767550B CN112767550B CN202110005181.7A CN202110005181A CN112767550B CN 112767550 B CN112767550 B CN 112767550B CN 202110005181 A CN202110005181 A CN 202110005181A CN 112767550 B CN112767550 B CN 112767550B
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Abstract
The invention provides a grid-based space target light scattering characteristic modeling method, which aims to solve the problem that the existing grid part processing method is not suitable for calculating the light scattering characteristic of a space target with a large-size grid part. The grid-based space target light scattering characteristic modeling method comprises the following steps: establishing a latticed entity model according to the external outline of the latticed entity of the space target; performing single-layer medium subdivision on the latticed solid model by using subdivision software; and setting reflection coefficients of different positions of the single-layer medium according to the sparseness degree of the grid on the grid-shaped entity, and completing the light scattering characteristic modeling of the space target.
Description
Technical Field
The invention relates to the field of optics, in particular to a grid-based space target light scattering characteristic modeling method.
Background
The grid members of the spatial target are mainly radar antennas, as shown in fig. 1. Some radar antennas of a space object are much larger than other components of the space object, for example, the grid component may be hundreds of meters in size, while the other components are tens of meters in size, in which case the accuracy of the calculation of the characteristics of the grid component has a greater influence on the calculation of the light scattering characteristics of the whole space object. In the conventional grid part processing method, as shown in fig. 2, a grid entity is directly split, and the method is feasible for small parts, but for larger targets, the split work cannot be performed due to more grid lines and higher density, so that modeling simulation cannot be performed; in a conventional method, as shown in fig. 3, the grid part is directly split according to the surface elements, but the modeling method can only simulate the reflection characteristic of the grid part, loses the transmission characteristic of the grid part, has poor accuracy, and cannot meet the calculation accuracy requirement of the space target light scattering characteristic of the grid part.
Disclosure of Invention
The invention aims to solve the technical problem that the existing grid part processing method is not suitable for calculating the light scattering characteristics of a space target with a large-size grid part.
The invention discloses a space target light scattering characteristic modeling method based on grids, which comprises the following steps:
establishing a latticed entity model according to the external outline of the latticed entity of the space target;
performing single-layer medium subdivision on the latticed solid model by using subdivision software;
and setting reflection coefficients of different positions of the single-layer medium according to the sparseness degree of the grid on the grid-shaped entity, and completing the light scattering characteristic modeling of the space target.
Preferably, the splitting software performs single-layer medium splitting on the latticed solid model, including:
transforming the latticed solid model into a 2D topological graph by using subdivision software;
and selecting the outermost layer of the 2D topological graph, and then selecting the surface elements on the outermost layer to perform splitting operation to complete single-layer medium splitting.
Preferably, the specific method for transforming the latticed solid model into the 2D topological graph by using the subdivision software is as follows: and in the part of software, selecting corresponding entities in the grid-shaped entity model to perform deleting operation to obtain a 2D topological graph.
Preferably, the method further comprises:
setting the material of the single-layer medium.
Preferably, the software used for establishing the grid-like entity model according to the external outline of the grid-like entity of the space target is proE.
Preferably, the software used for establishing the latticed entity model according to the external outline of the latticed entity of the space target is SolidWorks.
Preferably, the subdivision software is Hypermesh.
Compared with the prior art, the invention has the following advantages:
the grid-shaped components are made of reflective and transmissive materials, and the built model can truly reflect the reflection characteristics of the large-size grid components on the space target and meet the calculation accuracy requirements of the light scattering characteristics of the space target with the large-size grid components. In addition, the method of the invention has lower requirement on the computer hardware configuration.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
FIG. 1 is a schematic diagram of a partial structure of a radar antenna according to the background art;
FIG. 2 is a schematic diagram of a partial structure of a latticed entity obtained by directly dividing the latticed entity in the background art part of the present invention;
FIG. 3 is a schematic diagram of a grid-like solid structure obtained by directly dividing a grid member into whole according to a surface element in the background art part of the invention;
FIG. 4 is a schematic flow chart of a grid-based spatial target light scattering property modeling method according to an embodiment of the invention;
FIG. 5 is a grid-like entity model created from the external contours of the grid-like entity shown in FIG. 1 in accordance with an embodiment of the present invention;
FIG. 6 is a model of an embodiment of the present invention after a single layer media split.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.
The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.
Fig. 4 is a schematic flowchart of a grid-based spatial target light scattering property modeling method according to an embodiment of the present invention, which may generally include:
step S1, establishing a latticed entity model according to the external outline of the latticed entity of the space target:
the light scattering characteristic simulation calculation only concerns the characteristics of the shape, the material, the reflectivity and the like of the component, so the step S1 only models according to the specific size of the shape of the grid component;
taking the space target latticed entity shown in fig. 1 (the latticed entity is a radar antenna) as an example, the latticed entity has a large number of grids, the step S1 does not need to model the grids, only the external overall outline of the latticed entity is modeled, and modeling software such as ProE or solidWorks is used for modeling the antenna as a curved surface entity as shown in fig. 5;
s2, performing single-layer medium subdivision on the latticed solid model by using subdivision software:
the model established in the step S1 is generally a solid body, in the splitting software Hypermesh, the solid body of the curved surface is subjected to solid body deleting operation so as to modify the model into a splittable 2D topological structure diagram, the 2D topological diagram of the solid body generally comprises multiple layers, in order to realize perspective calculation, single-layer medium splitting is required, namely, the outermost surface of the 2D topological diagram is selected, and then triangular surface elements are selected for splitting operation, so that single-layer medium splitting is realized, and the splitting result is shown in fig. 6;
step S3, setting reflection coefficients of different positions of the single-layer medium according to the sparseness degree of the grid on the grid-shaped entity, and completing light scattering characteristic modeling of the space target:
under illumination environment, the characteristics of the grid-shaped component are that the grid is reflected and the gaps are transmitted, so that the grid-shaped component has both reflection characteristics and transmission characteristics, before the single-layer medium is subjected to light scattering characteristic calculation, the properties such as reflection coefficient, transmission coefficient and material are required to be set according to the sparseness of the grid on the grid-shaped component, when the component is judged to be shielded, the single-layer grid medium is judged to be the single-layer grid medium, the grid-shaped component does not completely shield the component behind the grid-shaped component, the reflection coefficient of the component which is not shielded behind the grid-shaped component is multiplied by the transmission coefficient of the grid-shaped component, the product is taken as the reflection coefficient of the shielded part, and the reflection coefficient is added into the light scattering characteristic calculation, so that the characteristics of the grid-shaped component for simultaneous reflection and transmission are realized, and the space target light scattering characteristic modeling simulation calculation of the grid is realized.
The grid-based space target light scattering characteristic modeling method can achieve approximate real simulation of a large-size grid part, and the reflection and transmission method can solve the problem that the grid-shaped entity is not shielded but shielded through surface modeling simulation, so that the problem that the light scattering characteristics of the real grid and the shielding part thereof cannot be reflected, and related numerical values and image distortion are avoided. In addition, the curved surface grid solid modeling is complicated, the difficulty is high, the splitting software cannot successfully split due to a large number of grid parts, and the splitting can be completed under the condition of small grid size, but the challenge of a large number of tiny surface elements on the grid to computer simulation calculation is also huge, and the requirement on the memory is high.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (5)
1. A method for modeling light scattering characteristics of a grid-based spatial target, comprising:
establishing a latticed entity model according to the external outline of the latticed entity of the space target;
performing single-layer medium subdivision on the latticed solid model by using subdivision software;
setting reflection coefficients of different positions of the single-layer medium according to the sparseness degree of the grid on the grid-shaped entity, and completing the light scattering characteristic modeling of the space target;
the step of performing single-layer medium subdivision on the latticed solid model by using subdivision software comprises the following steps:
transforming the latticed solid model into a 2D topological graph by using subdivision software;
selecting an outermost layer of the 2D topological graph, and then selecting the surface elements on the outermost layer to perform splitting operation to finish single-layer medium splitting;
the concrete method for transforming the latticed solid model into the 2D topological graph by using the subdivision software comprises the following steps: and in the subdivision software, selecting a curved surface entity in the grid-shaped entity model for deleting operation to obtain a 2D topological graph.
2. The method as recited in claim 1, further comprising:
setting the material of the single-layer medium.
3. The method of claim 1, wherein the software used to build the mesh entity model from the external contours of the mesh entities of the spatial target is ProE.
4. The method of claim 1, wherein the software used to build the mesh entity model from the external contours of the mesh entities of the spatial target is SolidWorks.
5. The method of claim 1, wherein the split software is Hypermesh.
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| CN111553978A (en) * | 2020-04-28 | 2020-08-18 | 上海无线电设备研究所 | Three-dimensional rough model modeling method based on triangular mesh infinitesimal |
| CN112069713A (en) * | 2020-09-10 | 2020-12-11 | 上海无线电设备研究所 | Near-field scattering characteristic modeling method, electronic device and storage medium |
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| TW200802012A (en) * | 2005-11-30 | 2008-01-01 | 3M Innovative Properties Co | Method and apparatus for simulation of optical systems |
| US8542252B2 (en) * | 2009-05-29 | 2013-09-24 | Microsoft Corporation | Target digitization, extraction, and tracking |
| CN102306396B (en) * | 2011-09-15 | 2013-09-25 | 山东大学 | Three-dimensional entity model surface finite element mesh automatic generation method |
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| CN111553978A (en) * | 2020-04-28 | 2020-08-18 | 上海无线电设备研究所 | Three-dimensional rough model modeling method based on triangular mesh infinitesimal |
| CN112069713A (en) * | 2020-09-10 | 2020-12-11 | 上海无线电设备研究所 | Near-field scattering characteristic modeling method, electronic device and storage medium |
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