A Modeling Method for Non-Rotary Airborne Radar Radome

Abstract

The present invention discloses a modeling method for a non-rotational airborne radar radome, comprising: performing surface configuration and solid modeling on the non-rotational surface airborne radar radome to obtain a reconstructed digital model of the non-rotational airborne radar radome; and generating a frequency selective surface of the non-rotational airborne radar radome based on the digital model of the non-rotational airborne radar radome. The present invention realizes the precise creation of the digital model of the non-rotational airborne radar radome, so that the finally designed radome product can achieve the initially designed electrical performance index in the actual application environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-performance aircraft radome, and particularly relates to a modeling method for a non-rotary airborne radar radome. Background Art

[0002] As the "goggles" of an airborne radar, a radome is a key structure for improving the aerodynamic shape of an aircraft carrier and protecting the radar to work properly in harsh environments.

[0003] Typical airborne radar radomes generally have a streamlined, nose-cone-shaped rotary surface. The new-generation airborne radar radome has gradually evolved into a non-rotary surface like a duckbill. The sharp leading-edge surface design will endow the aircraft with more excellent stealth performance and more ideal aerodynamic shape. At present, the vast majority of existing literature on non-rotary airborne radar radomes focuses on directions such as material preparation, simulation analysis, and processing technology. The digital model is the basis for related research on airborne radar radomes. The development design, simulation analysis, processing manufacture, test verification, and maintenance modification of the new-generation airborne radar radome all rely on the digital model. However, existing research generally starts from an ideal digital model with an infinitely large loading plane and an infinitely thin loading metal layer, and the final product often fails to meet the originally designed electrical performance indicators in the actual application environment. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a modeling method for a non-rotary airborne radar radome.

[0005] The technical problems to be solved by the present invention are realized through the following technical solutions:

[0006] A modeling method for a non-rotary airborne radar radome includes:

[0007] Performing surface configuration and solid modeling on the non-rotary surface airborne radar radome to obtain a reconstructed digital model of the non-rotary airborne radar radome;

[0008] Generating a frequency selective surface of the non-rotary airborne radar radome based on the digital model of the non-rotary airborne radar radome.

[0009] Optionally, the performing surface configuration and solid modeling on the non-rotary surface airborne radar radome includes:

[0010] Obtaining point cloud data of the solid surface of the non-rotary surface airborne radar radome;

[0011] Performing surface reconstruction of the non-rotary airborne radar radome based on the point cloud data;

[0012] Perform solid modeling of a non-rotary airborne radar radome based on the reconstructed shape surface of the non-rotary airborne radar radome.

[0013] Optionally, before performing the solid modeling, the method further includes:

[0014] Edit and optimize the reconstructed shape surface of the non-rotary airborne radar radome so that the optimized shape surface of the non-rotary airborne radar radome conforms to the shape of the non-rotary surface airborne radar radome entity;

[0015] Verify the geometric dimensions and functions of the optimized shape surface of the non-rotary airborne radar radome.

[0016] Optionally, the shape surface reconstruction of the non-rotary airborne radar radome based on the point cloud data includes:

[0017] Obtain the three views of the non-rotary airborne radar radome and construct a wireframe model of the non-rotary airborne radar radome based on the three views;

[0018] Extract the point cloud data of the shape surface configuration line and the shape surface guiding line of the non-rotary airborne radar radome based on the wireframe model;

[0019] Reconstruct the port configuration line and the shape surface guiding line of the non-rotary airborne radar radome based on the point cloud data of the shape surface configuration line and the shape surface guiding line;

[0020] Using the port configuration line as the cross-sectional shape control curve and the shape surface guiding line as the shape surface shape control curve, reconstruct the shape surface of the non-rotary airborne radar radome by using the multi-section surface construction method.

[0021] Optionally, the wireframe model includes: two port configuration lines C1 and C2, two shape surface edge guiding lines L c and L d , the upper shape surface ridge line guiding line L a and the lower shape surface ridge line guiding line L b ;

[0022] Reconstruct the port configuration line and the shape surface guiding line of the non-rotary airborne radar radome based on the point cloud data of the shape surface configuration line and the shape surface guiding line, including:

[0023] Reconstruct C1 and C2 based on the point cloud data of C1 and C2;

[0024] Based on C1, C2, L c , L d , L a and L b reconstruct L c , L d , L a , Lb and multiple Ls n ; wherein, L n is an added surface contour guiding line; the added surface contour guiding line includes surface contour guiding lines located on both sides of L a and surface contour guiding lines located on both sides of L b .

[0025] Optionally, generating a frequency selective surface of a non-rotary airborne radar radome based on the digital model of the non-rotary airborne radar radome includes:

[0026] Determining the starting positions of each frequency selection period on the contour edge guiding line of the non-rotary airborne radar radome surface;

[0027] According to the starting positions of each frequency selection period, constructing isoparametric curves parallel to the port configuration line of the non-rotary airborne radar radome surface on the surface of the non-rotary airborne radar radome surface;

[0028] According to the starting positions of each frequency selection period on the contour edge guiding line and each isoparametric curve, determining the number of frequency selection units and the center positions of each frequency selection unit;

[0029] Generating a frequency selective surface of a non-rotary airborne radar radome according to the center positions of each frequency selection unit.

[0030] Optionally, determining the starting positions of each frequency selection period on the contour edge guiding line of the non-rotary airborne radar radome surface includes:

[0031] Marking a first auxiliary point P1 and a second auxiliary point P2 on the center line of the non-rotary airborne radar radome surface; the first auxiliary point P1 is determined according to the distance between the starting position of frequency selection on the center line and the vertex of the non-rotary airborne radar radome surface, and the second auxiliary point P2 is determined according to the distance between the cut-off position of frequency selection on the center line and the center point of the end face of the non-rotary airborne radar radome surface;

[0032] Projecting P1 and P2 along the normal direction of the center line onto the contour edge guiding line to obtain the starting position P1' of frequency selection and the cut-off position P2' of frequency selection on the contour edge guiding line;

[0033] Determining the number of frequency selection periods according to the line length between P1' and P2' on the contour edge guiding line;

[0034] Determining the starting positions of each frequency selection period on the contour edge guiding line according to the number of frequency selection periods.

[0035] Optionally, determining the number of frequency selection periods according to the line length between P1' and P2' on the guiding line of the shaped surface edge includes:

[0036] Dividing the line length between P1' and P2' on the guiding line of the shaped surface edge by the spacing D at the starting position of the frequency selection period y , and taking the integer of the calculation result to obtain the number of frequency selection periods.

[0037] Optionally, determining the number of frequency selection units and the central positions of each frequency selection unit according to the starting positions of each frequency selection period on the guiding line of the shaped surface edge and each isoparametric curve includes:

[0038] For each isoparametric curve, dividing its length l i by the array spacing D of the frequency selection units x , and taking the integer of the calculation result to obtain the number of frequency selection units on this isoparametric curve;

[0039] Determining the number of frequency selection units and the central positions of each frequency selection unit according to the starting positions of each frequency selection period on the guiding line of the shaped surface edge and the number of frequency selection units on each isoparametric curve.

[0040] Optionally, generating the frequency selection surface of the non-rotary airborne radar radome according to the central positions of each frequency selection unit includes:

[0041] For the central position of each frequency selection unit, make a tangent plane of the non-rotary metallic frequency selection base surface of the non-rotary airborne radar radome digital model passing through this central position, perform plane modeling of the frequency selection unit on this tangent plane, and then map the modeled planar frequency selection unit to the non-rotary metallic frequency selection layer base;

[0042] When all frequency selection units are mapped to the non-rotary metallic frequency selection layer base, the frequency selection surface of the non-rotary airborne radar radome is obtained.

[0043] The non-rotary airborne radar radome modeling method provided by the present invention first performs shaped surface configuration on the non-rotary surface airborne radar radome to obtain the reconstructed shaped surface of the non-rotary airborne radar radome, and then generates the frequency selection surface of the non-rotary airborne radar radome based on the shaped surface of the non-rotary airborne radar radome. Compared with the design method of the non-rotary airborne radar radome generally based on the ideal digital model with an infinite loading plane and an infinitely thin loading metal layer in the prior art, the present invention effectively improves the modeling accuracy of the non-rotary airborne radar radome, and can enable the finally designed product to achieve the initially designed electrical performance index in the actual application environment.

[0044] The following will further elaborate on the present invention in conjunction with the accompanying drawings. Description of the Drawings

[0045] Figure 1 is a flowchart of a method for modeling a non-rotational airborne radar radome provided by an embodiment of the present invention;

[0046] Figure 2 Schematically shows a wireframe model of a non-rotational airborne radar radome;

[0047] Figure 3 Shows a schematic diagram of reconstructing the port configuration line and the surface guiding line of a non-rotational airborne radar radome based on the point cloud data of the surface configuration line and the surface guiding line;

[0048] Figure 4 Is a schematic diagram of constructing multi-section surfaces based on the port configuration line and the surface guiding line to generate the upper surface and the lower surface of a non-rotational airborne radar radome;

[0049] Figure 5 Schematically shows a surface of a non-rotational airborne radar radome;

[0050] Figure 6 Schematically shows a constructed digital model of a non-rotational airborne radar radome;

[0051] Figure 7 Schematically shows a plane determined by the surface edge guiding line of a surface of a non-rotational airborne radar radome;

[0052] Figure 8 Is a schematic diagram of arranging frequency selective units formed by constructing isoparametric curves on the surface of a non-rotational airborne radar radome according to an embodiment of the present invention;

[0053] Figure 9 Is a schematic diagram of mapping a planar frequency selective unit to a non-rotational metallic frequency selective layer substrate according to an embodiment of the present invention;

[0054] Figure 10 Schematically shows a constructed digital model of a non-rotational airborne radar radome and the frequency selective surface of the non-rotational airborne radar radome. Detailed Embodiments

[0055] The following further describes the present invention in detail with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0056] Traditional airborne radar radomes generally have a regular rotary shape. Usually, the generatrix is defined by standard external shape equations such as conical evolution shape, tangent egg shape, and Hack shape, or discrete data points, and then the entire radome body is defined through feature operations such as rotation and shelling based on the generatrix. For the new generation of airborne radar radomes, in order to greatly reduce the wind resistance and improve the aerodynamic and stealth characteristics of the radome, they are generally designed as irregular non-rotary shapes, usually symmetric left and right and asymmetric up and down. For example, the forward edge of a certain airborne radar radome is designed with a sharp edge, and the upper and lower surfaces have a small upper diameter and a large lower diameter, presenting a duckbill shape.

[0057] When establishing a digital model of a non-rotary airborne radar radome, it is necessary to ensure that the flow lines at each part of the surface are accurate. Therefore, it is more difficult compared to the rotary surface where the surface model can be constructed simply by rotating the generatrix.

[0058] In order to accurately create a digital model of a non-rotary airborne radar radome, so that the finally designed radome product can meet the initial designed electrical performance indicators in the actual application environment, the embodiment of the present invention provides a modeling method for a non-rotary airborne radar radome, as Figure 1 shown, this method includes the following steps:

[0059] S10. Configure the surface and perform solid modeling on the non-rotary surface airborne radar radome to obtain a reconstructed digital model of the non-rotary airborne radar radome.

[0060] In the embodiment of the present invention, there are multiple specific implementation methods for configuring the surface of the non-rotary surface airborne radar radome.

[0061] Exemplarily, in one implementation method, according to the aerodynamic surface design parameters of the non-rotary surface airborne radar radome given, the surface of the non-rotary airborne radar radome can be directly constructed in the simulation software, and then the solid modeling of the non-rotary airborne radar radome can be carried out based on the reconstructed surface of the non-rotary airborne radar radome. In another implementation method, configuring the surface and performing solid modeling on the non-rotary surface airborne radar radome may include the following steps S101 to S103:

[0062] S101. Obtain the point cloud data of the solid surface of the non-rotary surface airborne radar radome.

[0063] Here, the point cloud data of the solid surface of the non-rotary surface airborne radar radome includes the three-dimensional coordinates of multiple points on the solid surface of the non-rotary surface airborne radar radome.

[0064] S102. Reconstruct the surface of the non-rotary airborne radar radome based on the point cloud data.

[0065] Specifically, the following steps S1021 to S1024 are involved in the surface reconstruction of a non-rotary airborne radar radome based on point cloud data.

[0066] S1021. Obtain the three views of the non-rotary airborne radar radome and construct a wireframe model of the non-rotary airborne radar radome based on the three views.

[0067] Specifically, according to the basic dimensional parameters of the aircraft entity carrying the airborne radar, extract the three main views of the outer surface contour of its airborne radar radome at a certain ratio (for example, 1:10): the front view, the side view, and the top view, as shown in subfigures (a), (b), and (c) of Figure 2 respectively; based on the three views of the airborne radar radome, perform boundary expression on the aircraft radome to obtain the wireframe model of the aircraft radome as shown in subfigure (d) of Figure 2 respectively.

[0068] Among them, as shown in subfigure (d) of Figure 2 , the wireframe model includes: two port configuration lines C1 and C2, two surface edge guiding lines L c and L d , the upper surface ridge line guiding line L a and the lower surface ridge line guiding line L b . Among them, the overall shape of each cross-section of the radome surface is controlled by C1 and C2, and the shape details of each part of the upper and lower surfaces can be controlled by the surface edge guiding lines L c , L d and the upper and lower surface ridge line guiding lines L a , L b . Specifically, the surface edge guiding lines L c , L d control the design shape change of the sharp leading edge of the surface, and the upper and lower surface ridge line guiding lines L a , L b control the overall curvature change of the upper and lower surfaces.

[0069] S1022. Extract the point cloud data of the surface configuration lines and surface guiding lines of the non-rotary airborne radar radome based on the wireframe model.

[0070] Specifically, from all the point cloud data obtained in step S101, extract the point cloud data located at the surface configuration lines and surface guiding lines of the non-rotary airborne radar radome. Here, the surface configuration lines include two port configuration lines C1 and C2; the surface guiding lines include two surface edge guiding lines L c and L d , the upper surface ridge line guiding line L a and the lower surface ridge line guiding line L b .

[0071] The point cloud data of the surface configuration line and the surface guiding line of a non-rotary airborne radar radome are schematically shown in Table 1.

[0072] Table 1

[0073] Line type <![CDATA[C1]]> <![CDATA[C2]]> <![CDATA[L a > Data point (0,-525,0) (0,525,0) (0,0,330) Data point (0,-450,118) (0,480,-135) (280,0,300) Data point (0,-350,220) (0,350,-400) (700,0,220) Data point (0,-250,280) (0,190,-550) (1150,0,90) Data point (0,0,330) (0,0,-600) (1400,0,0) Data point (0,250,280) (0,-190,-550) / Data point (0,350,220) (0,-350,-400) / Data point (0,450,118) (0,-480,-135) / Data point (0,525,0) (0,-525,0) / <![CDATA[L b > <![CDATA[L c > <![CDATA[L d > Data point (0,0,-600) (0,-525,0) (0,525,0) Data point (280,0,-560) (280,-450,0) (280,450,0) Data point (700,0,-400) (700,-330,0) (700,330,0) Data point (1150,0,-160) (1150,-150,0) (1150,150,0) Data point (1400,0,0) (1400,0,0) (1400,0,0)

[0074] S1023. Reconstruct the port configuration line and the surface guiding line of the non-rotary airborne radar radome based on the point cloud data of the surface configuration line and the surface guiding line.

[0075] Specifically, in one implementation, reconstructing the port configuration line and the surface guiding line of the non-rotary airborne radar radome based on the point cloud data of the surface configuration line and the surface guiding line may include: reconstructing C1 and C2 based on the point cloud data of C1 and C2, and based on L c 、L d 、L a and L b respectively reconstruct L c 、L d 、L a 、L b .

[0076] In another implementation, reconstructing the port configuration line and the surface guiding line of the non-rotary airborne radar radome based on the point cloud data of the surface configuration line and the surface guiding line may include: reconstructing C1 and C2 based on the point cloud data of C1 and C2, and based on C1, C2, L c 、L d 、L a and L b respectively reconstruct L c 、L d 、L a 、L b and multiple L n . Here, L n is an additional surface guiding line; the additional surface guiding line includes the surface guiding lines on both sides of L a and the surface guiding lines on both sides of L b , and these additional surface guiding lines and L a 、L b are all connected to the port configuration line at one end and converge at the tips of the upper and lower surfaces at the other end. By increasing the number of the upper and lower surface ridge line guiding lines L n , the curvature of each part of the upper and lower surfaces can be controlled more precisely, and the accurate characterization of the non-rotary surface of the airborne radar radome can be realized.

[0077] Thus, the surface S of the non-rotary airborne radar radome can be characterized by the following equation:

[0078] S = α * C1 + C2 + β * (L a + L b + … + L n ));

[0079] In this formula, both α and β are scale factors.

[0080] Figure 3 Fig. shows a schematic diagram of reconstructing the port configuration line and the surface guiding line of a non-rotary airborne radar radome based on the point cloud data of the surface configuration line and the surface guiding line. The discrete points therein are the points whose three-dimensional coordinates can be obtained through step S101. Based on these discrete points, the complete port configuration line and the surface guiding line can be reconstructed under the guidance of the wireframe model.

[0081] S1024. Using the port configuration line as the cross-sectional shape control curve and the surface guiding line as the surface shape control curve, reconstruct the surface of the non-rotary airborne radar radome by using the multi-section surface construction method.

[0082] Specifically, construct a multi-section surface based on the port configuration line and the surface guiding line to generate the upper surface and the lower surface as shown in Figure 4 . Perform cavity construction on the surface to obtain a cavity model, and perform a Boolean operation on the cavity model and the base model ( Figure 4 ), and finally generate the surface of the non-rotary airborne radar radome as shown in the sub-figure (c) of Figure 5 .

[0083] In addition, after reconstructing the surface of the non-rotary airborne radar radome, the reconstructed surface of the non-rotary airborne radar radome can also be edited and optimized so that the optimized surface of the non-rotary airborne radar radome conforms to the basic shape of the non-rotary surface airborne radar radome entity; then, check the geometric dimensions and functions of the optimized surface of the non-rotary airborne radar radome to ensure the model accuracy.

[0084] S103. Perform solid modeling of the non-rotary airborne radar radome based on the reconstructed surface of the non-rotary airborne radar radome.

[0085] That is, realize the solid modeling of the radome with the radome surface as the reference to form a digital model of the non-rotary airborne radar radome.

[0086] In a specific example, based on the point cloud data shown in Table 2 below, the constructed digital model of the non-rotary airborne radar radome is as shown in Figure 6 .

[0087] Table 2

[0088] Line category <![CDATA[C1]]> <![CDATA[C2]]> <![CDATA[L a > Data point (0,-620,0) (0,620,0) (0,0,372) Data point (0,-310,280) (0,565,-95) (410,0,345) Data point (0,0,372) (0,510,-190) (820,0,275) Data point (0,310,280) (0,455,-285) (1230,0,150) Data point (0,620,0) (0,400,-380) (1640,0,0) Data point / (0,200,-500) / Data point / (0,0,-558) / Data point / (0,-200,-500) / Data point / (0,-400,-380) / Data point / (0,-455,-285) / Data point / (0,-510,-190) / Data point / (0,-565,-95) / Data point / (0,-620,0) / Line category <![CDATA[L b > <![CDATA[L c > <![CDATA[L d > Data point (0,0,-558) (0,-620,0) (0,620,0) Data point (410,0,-500) (550,-465,0) (550,465,0) Data point (820,0,-400) (1000,-310,0) (1000,310,0) Data point (1230,0,-240) (1350,-155,0) (1350,155,0) Data point (1640,0,0) (1640,0,0) (1640,0,0)

[0089] S20. Generate a frequency selective surface for a non-rotational airborne radar radome based on the digital model of the non-rotational airborne radar radome.

[0090] It can be understood that for the surface of a rotational airborne radar radome, in the same latitudinal plane, the central coordinates of each frequency selective unit can be calculated through the polar coordinate system. However, for the surface of a non-rotational airborne radar radome, the curvature changes at different points along the same latitude line, making it difficult to calculate the central coordinates of each frequency selective unit.

[0091] Therefore, in the embodiments of the present invention, generating a frequency selective surface for a non-rotational airborne radar radome based on the digital model of the non-rotational airborne radar radome includes the following steps S201 to S203:

[0092] S201. Determine the starting positions of each frequency selection period on the profile edge guiding line of the non-rotational airborne radar radome surface.

[0093] Specifically, referring to Figure 7 , Figure 7 is the plane determined by the profile edge guiding line L c of the non-rotational airborne radar radome surface and L d . Determine the starting positions of each frequency selection period on the profile edge guiding line (L c or L d ) of the non-rotational airborne radar radome surface, including the following steps S2011 to S2014:

[0094] S2011. Mark the first auxiliary point P1 and the second auxiliary point P2 on the center line L m of the non-rotational airborne radar radome surface.

[0095] Here, the first auxiliary point P1 is determined according to the distance between the starting position of frequency selection on the center line L m and the vertex P0 of the non-rotational airborne radar radome surface, and the second auxiliary point P2 is determined according to the distance between the cut-off position of frequency selection on the center line L m and the center point P3 of the end face of the non-rotational airborne radar radome surface; in practice, the distance between the starting position of frequency selection on the center line L m and P0, as well as the distance between the cut-off position of frequency selection on the center line L m and P3 are given by the designer of the airborne radar radome.

[0096] S2012. Project P1 and P2 along the normal direction of the center line L m onto the profile edge guiding line (L c or L d ), and obtain the profile edge guiding line (L cor L d ) on the frequency selection starting position P1' and the frequency selection ending position P2'.

[0097] S2013. Determine the number of frequency selection cycles according to the line length between P1' and P2' on the surface edge guide line.

[0098] Specifically, use the line length between P1' and P2' on the edge of the surface guide line Divide by the spacing D between the start positions of the frequency selection cycle y , and the calculation results Round off to get the frequency selection cycle number Num' y .

[0099] S2014. Determine the starting position of each frequency selection period on the surface edge guide line according to the number of frequency selection periods.

[0100] Specifically, P1' is used as the reference point of the starting position of the frequency selection cycle, and D y To select the spacing between frequency cycles, you can guide the line L on the edge of the surface. c Determine the starting position N of each frequency selection cycle in turn i , 1≤i≤Num' y .

[0101] S202: constructing an isoparametric curve parallel to a port configuration line of the non-rotating airborne radar radome surface on the surface of the non-rotating airborne radar radome surface according to the starting position of each frequency selection period.

[0102] Specifically, the frequency selection units are usually arranged on the non-expandable surface in a certain spatial pattern to achieve wave transmission and filtering in a specific frequency band. On a non-expandable non-rotating surface such as a non-rotating airborne radar radome, the frequency selection units can be arranged by constructing an isoparametric curve parallel to the port configuration lines C1 and C2 on the surface of the radome as an auxiliary line. The isoparametric curve is a graph presented by the dependent variable when all parameters in the same system remain unchanged and the curve only changes with the independent variable. In the embodiment of the present invention, the guide line L on the edge of the surface is used as an auxiliary line. c or L d The starting position of the frequency selection cycle determined above is the independent variable of the isoparametric curve, and the tangent direction of the upper and lower surfaces of the radome at the starting position of each frequency selection cycle is used as the constant parameter to construct the isoparametric curve, as shown in the figure: Figure 8 shown.

[0103] S203 : Determine the number of frequency selection units and the center position of each frequency selection unit according to the starting position of each frequency selection period on the surface edge guide line and each isoparametric curve.

[0104] Specifically, according to the starting positions of each frequency selection period on the guiding line of the shaped surface edge and each isoparametric curve, the number of frequency selection units and the central positions of each frequency selection unit are determined, including S2031 to S2032:

[0105] S2031. For each isoparametric curve, divide its length l i by the array spacing D of the frequency selection units x , and round the calculation result to obtain the number of frequency selection units on this isoparametric curve.

[0106] See Figure 8 , let the isoparametric curve determined with point N i as the independent variable be Measure the curve length of the isoparametric curve as l i . Assume that the array spacing of the frequency selection units on the same latitude is D x . From D x and l i , the theoretical number of frequency selection units on the isoparametric curve can be obtained as:

[0107]

[0108] Then, take as the integer quantity of , and use as the actual number of frequency selection units on the isoparametric curve .

[0109] S2032. According to the starting positions of each frequency selection period on the guiding line of the shaped surface edge and the number of frequency selection units on each isoparametric curve, determine the number of frequency selection units and the central positions of each frequency selection unit.

[0110] Specifically, given the theoretical number of frequency selection units on the isoparametric curve , then the actual distance between the centers of each frequency selection unit on the isoparametric curve is:

[0111]

[0112] Thus, taking the starting points N c of each frequency selection period on the guiding line L i of the shaped surface edge as the array reference points for the corresponding frequency selection units, and using as the array spacing, perform unit division on the non-rotary airborne radar radome shaped surface. Thus, the number of frequency selection units and the central positions of each frequency selection unit can be determined, as shown in Figure 8 .

[0113] S204. Generate a frequency selective surface of a non-rotational airborne radar radome according to the central positions of the respective frequency selection units.

[0114] Specifically, refer to Figure 9 , for the central position of each frequency selection unit, make a tangent plane of the non-rotational metal frequency selection base surface of the digital model of the non-rotational airborne radar radome through this central position, perform plane modeling of the frequency selection unit on this tangent plane to obtain a plane model, and then map the modeled plane frequency selection unit to this non-rotational metal frequency selection layer base, that is, first map from the plane model to the space model, and then map the space model to the non-rotational metal frequency selection layer base, so as to obtain a non-rotational frequency selection unit (FSS model); this mapping process is as Figure 9 shown. Thus, when all the frequency selection units are mapped to the non-rotational metal frequency selection layer base, the frequency selective surface of the non-rotational airborne radar radome can be obtained.

[0115] In a specific example, based on the point cloud data shown in Table 3, the constructed digital model of the non-rotational airborne radar radome and the frequency selective surface of the non-rotational airborne radar radome are as Figure 10 shown.

[0116] Table 3

[0117]

[0118] Data point (0,-525,0) (0,525,0) (0,0,330) Data point (0,-450,118) (0,480,-135) (280,0,300) Data point (0,-350,220) (0,350,-400) (700,0,220) Data point (0,-250,280) (0,190,-550) (1150,0,90) Data point (0,0,330) (0,0,-600) (1400,0,0) Data point (0,250,280) (0,-190,-550) / Data point (0,350,220) (0,-350,-400) / Data point (0,450,118) (0,-480,-135) / Data point (0,525,0) (0,-525,0) / Line category <![CDATA[L b > <![CDATA[L c > <![CDATA[L d > Data point (0,0,-600) (0,-525,0) (0,525,0) Data point (280,0,-560) (280,-450,0) (280,450,0) Data point (700,0,-400) (700,-330,0) (700,330,0) Data point (1150,0,-160) (1150,-150,0) (1150,150,0) Data point (1400,0,0) (1400,0,0) (1400,0,0)

[0119] In summary, the non-rotational airborne radar radome modeling method provided by the present invention first performs surface configuration on the non-rotational surface airborne radar radome to obtain a reconstructed non-rotational airborne radar radome surface, and then generates a frequency selective surface of the non-rotational airborne radar radome based on the non-rotational airborne radar radome surface. Compared with the existing design method for non-rotational airborne radar radomes that generally expands based on an ideal digital model with an infinite loading plane and an infinitely thin loading metal layer, the present invention effectively improves the modeling accuracy of non-rotational airborne radar radomes. The non-rotational airborne radar radome modeling method provided by the embodiments of the present invention can be widely applied to the creation of digital models of non-rotational FSS radomes for aircraft platforms, and can enable the finally designed radome products to meet the initially designed electrical performance indicators in the actual application environment.

[0120] It should be noted that the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present invention.

[0121] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0122] Although the present invention has been described in connection with various embodiments herein, however, in the process of implementing the claimed invention, those skilled in the art can understand and achieve other variations of the disclosed embodiments by viewing the accompanying drawings and the disclosure. In the description of the present invention, the term "including" does not exclude other components or steps, the term "a" or "one" does not exclude a plurality of cases, and the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, certain measures are described in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0123] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A modeling method for a non-rotary airborne radar radome, characterized in that Including: Obtain the three views of a non-rotational airborne radar radome, and construct a wireframe model of the non-rotational airborne radar radome based on the three views; The wireframe model includes: two port configuration lines C1 and C2, and two form surface edge guide lines L c and L d , an upper form surface ridge line guide line L a and a lower form surface ridge line guide line L b ; Extract the point cloud data of the surface configuration line and the surface guiding line of the non-rotational airborne radar radome based on the wireframe model; The method comprises the following steps: reconstructing the port configuration line and the shape guide line of the non-rotating airborne radar antenna cover based on the point cloud data of the shape configuration line and the shape guide line, and reconstructing C1 and C2 based on the point cloud data of C1 and C2; reconstructing the port configuration line and the shape guide line of the non-rotating airborne radar antenna cover ..., C2, L c , L d , L a and L b Point cloud data reconstruction L c , L d , L a , L b and multiple L n Among them, L n The additional shape guide line includes the shape guide line located at L a The shape guide lines on both sides and the L b Surface guide lines on both sides; Using the port configuration line as the cross-section shape control curve and the surface guiding line as the surface shape control curve, reconstruct the surface of the non-rotational airborne radar radome by using the multi-section surface construction method; Based on the reconstructed surface of the non-rotational airborne radar radome, perform solid modeling of the non-rotational airborne radar radome to obtain a reconstructed digital model of the non-rotational airborne radar radome; Based on the digital model of the non-rotational airborne radar radome, generate a frequency selective surface of the non-rotational airborne radar radome; The generating a frequency selective surface of the non-rotational airborne radar radome based on the digital model of the non-rotational airborne radar radome includes: Determine the starting positions of each frequency selection period on the surface edge guiding line of the non-rotational airborne radar radome surface; According to the starting positions of each frequency selection period, construct isoparametric curves parallel to the port configuration line of the non-rotational airborne radar radome surface on the surface of the non-rotational airborne radar radome surface; According to the starting positions of each frequency selection period on the surface edge guiding line and each isoparametric curve, determine the number of frequency selection units and the center positions of each frequency selection unit; Generate a frequency selective surface of the non-rotational airborne radar radome according to the center positions of each frequency selection unit; The determining the starting positions of each frequency selection period on the surface edge guiding line of the non-rotational airborne radar radome surface includes: Mark a first auxiliary point P1 and a second auxiliary point P2 on the center line of the non-rotational airborne radar radome surface; the first auxiliary point P1 is determined according to the distance between the starting position of frequency selection on the center line and the vertex of the non-rotational airborne radar radome surface, and the second auxiliary point P2 is determined according to the distance between the cut-off position of frequency selection on the center line and the center point of the end face of the non-rotational airborne radar radome surface; Project P1 and P2 along the normal direction of the center line onto the surface edge guiding line to obtain the starting position P1' and the cut-off position P2' of frequency selection on the surface edge guiding line; Determine the number of frequency selection periods according to the line length between P1' and P2' on the surface edge guiding line; According to the number of frequency selection periods, determine the starting positions of each frequency selection period on the surface edge guiding line.

2. The method for modeling a non-rotating airborne radar radome according to claim 1, characterized in that: Before performing the solid modeling, the method further includes: Edit and optimize the reconstructed surface of the non-rotational airborne radar radome so that the optimized surface of the non-rotational airborne radar radome conforms to the shape of the non-rotational airborne radar radome entity; Check the geometric dimensions and functions of the optimized surface of the non-rotational airborne radar radome.

3. The method for modeling a non-rotating airborne radar radome according to claim 1, wherein: The determining the number of frequency selection periods according to the line length between P1' and P2' on the surface edge guiding line includes: Divide the line length between P1' and P2' on the edge guide line of the surface by the spacing D between the starting positions of the frequency selection cycle y , and round the calculated result to get the frequency selection cycle number.

4. The method for modeling a non-rotating airborne radar radome according to claim 1, wherein: Determining the number of frequency selection units and the central positions of each frequency selection unit according to the starting positions of each frequency selection period on the contour edge guiding line and each equal-parameter curve, includes: For each isoparametric curve, use its length l i Divide by the frequency selective unit array spacing D x , and round the calculated result to obtain the number of frequency selective units on the parameter curve; Determining the number of frequency selection units and the central positions of each frequency selection unit according to the starting positions of each frequency selection period on the contour edge guiding line and the number of frequency selection units on each equal-parameter curve.

5. The method for modeling a non-rotating airborne radar radome according to claim 4, wherein: Generating a frequency selection surface of a non-rotary airborne radar radome according to the central positions of each frequency selection unit, includes: For the central position of each frequency selection unit, a tangent plane of the non-rotary metal frequency selection base surface of the digital model of the non-rotary airborne radar radome is made through this central position, and plane modeling of the frequency selection unit is carried out on this tangent plane, and then the modeled plane frequency selection unit is mapped to the non-rotary metal frequency selection layer base; When all frequency selection units are mapped to the non-rotary metal frequency selection layer base, the frequency selection surface of the non-rotary airborne radar radome is obtained.

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