Non-rotary airborne radar radome modeling method

Abstract

The invention discloses a modeling method for a non-rotary airborne radar radome, and the method comprises the steps: carrying out the surface configuration and solid modeling of a non-rotary surface airborne radar radome, and obtaining a reconstructed digital model of the non-rotary airborne radar radome; and generating the frequency selective surface of the non-rotary airborne radar radome based on the digital model of the non-rotary airborne radar radome. According to the method, accurate creation of the digital model of the non-rotary airborne radar radome is realized, so that the finally designed radome product reaches the electrical performance index of the initial design in the actual application environment.

Description

Technical Field

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

[0002] The radome serves as the "goggles" of the airborne radar. It is a key structure that improves the aerodynamic shape of the aircraft carrier and protects the radar to operate normally in harsh environments.

[0003] Typical airborne radar radomes are generally streamlined, nose-cone-shaped, and revolving surfaces. The new generation of airborne radar radomes have gradually evolved into duckbill-shaped non-revolving surfaces. The sharp leading edge surface design will give the aircraft better stealth performance and a more ideal aerodynamic shape. At present, most of the existing literature on non-revolving airborne radar radomes focuses on material preparation, simulation analysis, and processing technology. Digital models are the basis of research related to airborne radar radomes. The development, design, simulation analysis, processing, manufacturing, testing, verification, and maintenance and modification of the new generation of airborne radar radomes all rely on digital models. However, existing research is generally based on ideal digital models with infinite loading planes and infinitely thin loading metal layers. The final product is often difficult to achieve the electrical performance indicators originally designed 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-rotating airborne radar antenna cover.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] A modeling method for a non-rotating airborne radar radome, comprising:

[0007] The non-rotating airborne radar radome is subjected to surface configuration and entity modeling to obtain a reconstructed digital model of the non-rotating airborne radar radome;

[0008] Based on the digital model of the non-rotating airborne radar radome, a frequency selective surface of the non-rotating airborne radar radome is generated.

[0009] Optionally, the surface shaping and entity modeling of the non-rotating airborne radar radome includes:

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

[0011] Reconstructing the shape of a non-rotating airborne radar radome based on the point cloud data;

[0012] Solid modeling of non-rotating airborne radar radome is carried out based on the reconstructed non-rotating airborne radar radome surface.

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

[0014] Editing and optimizing the reconstructed non-rotational airborne radar radome-shaped surface so that the optimized non-rotational airborne radar radome-shaped surface conforms to the shape of the non-rotational airborne radar radome entity;

[0015] Verify the geometric dimensions and functions of the optimized non-rotating airborne radar antenna cover surface.

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

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

[0018] Extracting point cloud data of the surface configuration lines and surface guide lines of the non-rotating airborne radar radome based on the wireframe model;

[0019] Reconstructing the port configuration lines and the shape surface guide lines of the non-rotational airborne radar radome based on the point cloud data of the shape surface configuration lines and the shape surface guide lines;

[0020] The port configuration line is used as a cross-sectional shape control curve, and the surface guide line is used as a surface shape control curve, and a multi-section curved surface construction method is used to reconstruct the non-rotating airborne radar antenna cover surface.

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

[0022] Reconstructing the port configuration line and the shape surface guide line of the non-rotational airborne radar radome based on the point cloud data of the shape surface configuration line and the shape surface guide line includes:

[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 Point cloud data reconstruction L c , L d , L a , Lb and multiple L n Among them, L n The additional shape guide line includes a shape guide line located at L a The surface guide lines on both sides and the L b Surface guide lines on both sides.

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

[0026] Determining the starting position of each frequency selection cycle on the surface edge guide line of the non-rotating airborne radar radome surface;

[0027] According to the starting position of each frequency selection cycle, an isoparametric curve parallel to the port configuration line of the non-rotating airborne radar radome-shaped surface is constructed on the surface of the non-rotating airborne radar radome-shaped surface;

[0028] 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 edge guide line of the surface and each isoparametric curve;

[0029] According to the center position of each frequency selective unit, the frequency selective surface of the non-rotating airborne radar antenna cover is generated.

[0030] Optionally, determining the starting position of each frequency selection period on the surface edge guide line of the non-rotating 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-rotating airborne radar antenna cover-shaped surface; the first auxiliary point P1 is determined according to the distance between the frequency selection starting position on the center line and the vertex of the non-rotating airborne radar antenna cover-shaped surface, and the second auxiliary point P2 is determined according to the distance between the frequency selection cut-off position on the center line and the end center point of the non-rotating airborne radar antenna cover-shaped surface;

[0032] Project P1 and P2 along the normal direction of the center line onto the surface edge guide line to obtain a frequency selection starting position P1' and a frequency selection ending position P2' on the surface edge guide line;

[0033] Determine the frequency selection cycle number according to the line length between P1' and P2' on the surface edge guide line;

[0034] According to the number of frequency selection cycles, the starting position of each frequency selection cycle is determined on the surface edge guide line.

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

[0036] The line length between P1' and P2' on the edge guide line of the surface is divided by the spacing D of the starting positions of the frequency selection cycle. y , and round the calculated result to get the frequency selection cycle number.

[0037] Optionally, determining 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 includes:

[0038] For each isoparametric curve, use its length l i Divided 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;

[0039] The number of frequency selection units and the center position of each frequency selection unit are determined according to the starting position of each frequency selection period on the surface edge guide line and the number of frequency selection units on each isoparametric curve.

[0040] Optionally, generating a frequency selective surface of a non-rotating airborne radar radome according to the center position of each frequency selective unit includes:

[0041] For the center position of each frequency selection unit, a tangent plane of the non-rotational metal frequency selection substrate surface of the digital model of the non-rotational airborne radar antenna cover is made through the center position, and the frequency selection unit plane modeling is performed on the tangent plane, and then the modeled plane frequency selection unit is mapped to the non-rotational metal frequency selection layer substrate;

[0042] When all frequency selection units are mapped to the non-rotational metal frequency selection layer substrate, a frequency selection surface of a non-rotational airborne radar antenna cover is obtained.

[0043] The non-rotating airborne radar radome modeling method provided by the present invention first performs surface configuration on the non-rotating airborne radar radome to obtain a reconstructed non-rotating airborne radar radome surface, and then generates a frequency selective surface of the non-rotating airborne radar radome based on the non-rotating airborne radar radome surface. Compared with the design method of the non-rotating airborne radar radome based on an ideal digital model with an infinitely large loading plane and an infinitely thin loading metal layer in the prior art, the present invention effectively improves the modeling accuracy of the non-rotating airborne radar radome, and enables the final designed product to achieve the originally designed electrical performance indicators in the actual application environment.

[0044] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0046] Figure 2 A wireframe model of a non-rotating airborne radar radome is schematically shown;

[0047] Figure 3 A schematic diagram of reconstructing the port configuration lines and the surface guide lines of a non-rotating airborne radar radome based on the point cloud data of the surface configuration lines and the surface guide lines is shown;

[0048] Figure 4 It is a schematic diagram of constructing multi-section curved surfaces based on port configuration lines and surface guide lines to generate the upper and lower surfaces of the non-rotating airborne radar antenna cover;

[0049] Figure 5 A non-rotating airborne radar radome surface is schematically shown;

[0050] Figure 6 A constructed digital model of a non-rotating airborne radar radome is schematically shown;

[0051] Figure 7 The diagram schematically shows a plane defined by the edge guide lines of a non-rotating airborne radar radome surface;

[0052] Figure 8 It is a schematic diagram of the arrangement of frequency selection units formed by constructing equal parameter curves on the surface of a non-rotating airborne radar antenna cover according to an embodiment of the present invention;

[0053] Fig. 9 is a schematic diagram of mapping a planar frequency selection unit to a non-rotational metal frequency selection layer substrate in an embodiment of the present invention;

[0054] Fig.10 A constructed digital model of a non-rotating airborne radar antenna cover and a frequency selective surface of the non-rotating airborne radar antenna cover are schematically shown in FIG. DETAILED DESCRIPTION

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

[0056] Traditional airborne radar radomes are generally regular rotational shapes, usually defined by standard shape equations such as conical evolution, tangent oval, and Hake shape, or discrete data points, and then the entire radome body is defined by feature operations such as rotation and shell extraction based on the generatrix. In order to greatly reduce wind resistance and improve the aerodynamic and stealth characteristics of the radome, the new generation of airborne radar radomes are generally designed as irregular non-rotational shapes, usually symmetrical on the left and right and asymmetrical on the top and bottom. For example, the forward edge of an airborne radar radome is designed with sharp edges, and the upper and lower surfaces are small in upper diameter and large in lower diameter, in a duckbill shape.

[0057] When building a digital model of a non-rotating airborne radar radome, it is necessary to ensure that the streamlines at all locations on the surface are accurate. Therefore, it is more difficult to construct a surface model by simply rotating the generatrix than a rotating surface.

[0058] In order to realize the accurate creation of the digital model of the non-rotating airborne radar radome, so that the finally designed radome product can achieve the originally designed electrical performance indicators in the actual application environment, the embodiment of the present invention provides a non-rotating airborne radar radome modeling method, such as Figure 1 As shown, the method comprises the following steps:

[0059] S10. Performing surface configuration and entity modeling on the non-rotating airborne radar radome to obtain a reconstructed digital model of the non-rotating airborne radar radome.

[0060] In the embodiments of the present invention, there are multiple specific implementation methods for shaping the non-rotating airborne radar antenna cover.

[0061] Exemplarily, in one implementation, the non-rotating airborne radar radome surface can be directly constructed in the simulation software according to the given aerodynamic surface design parameters of the non-rotating airborne radar radome, so as to perform solid modeling of the non-rotating airborne radar radome based on the reconstructed non-rotating airborne radar radome surface. In another implementation, the surface configuration and solid modeling of the non-rotating airborne radar radome can include the following steps S101 to S103:

[0062] S101. Acquire point cloud data of a solid surface of a non-rotating airborne radar radome.

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

[0064] S102, reconstructing the non-rotating airborne radar antenna cover surface based on the point cloud data.

[0065] Specifically, the non-rotating airborne radar antenna cover surface is reconstructed based on the point cloud data, including steps S1021 to S1024.

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

[0067] Specifically, according to the basic size parameters of the aircraft entity carrying the airborne radar, three main views of the outer surface contour of the airborne radar antenna cover are extracted at a certain ratio (for example, 1:10): the front view, the side view and the top view, as shown in sequence. Figure 2 As shown in the sub-figures (a), (b), and (c) in FIG. 1 , the three-view drawing of the airborne radar antenna cover is used as a reference to express the boundary of the aircraft antenna cover, and the wireframe model of the aircraft antenna cover is obtained as shown in FIG. Figure 2 As shown in sub-figure (d) in .

[0068] Among them, Figure 2 As shown in sub-figure (d) in the figure, the wireframe model includes: two port configuration lines C1 and C2, two surface edge guide lines L c and L d , upper surface ridge guide line L a and the lower ridge line guide line L b The overall shape of each section of the radome surface is controlled by C1 and C2, and the shape details of each section of the upper and lower surfaces can be determined by the surface edge guide line L. c , L d and upper and lower ridge guide lines L a , L b Specifically, the surface edge guide line L c , L d Control the shape change of the sharp front edge design of the surface, and the upper and lower surface ridge guide line L a , L b Control the overall curvature change of the upper and lower surfaces.

[0069] S1022. Extracting point cloud data of surface configuration lines and surface guide lines of the non-rotating airborne radar antenna cover based on the wireframe model.

[0070] Specifically, from all the point cloud data acquired in step S101, point cloud data located at the shape surface configuration lines and shape surface guide lines of the non-rotating airborne radar antenna cover are extracted. Here, the shape surface configuration lines include two port configuration lines C1 and C2; the shape surface guide lines include two shape surface edge guide lines L c and L d , upper surface ridge guide line L a and the lower ridge line guide line L b .

[0071] Table 1 schematically shows the point cloud data of the surface configuration lines and surface guide lines of a non-rotating airborne radar antenna cover.

[0072] Table 1

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

[0074] S1023. Reconstruct the port configuration lines and the surface guide lines of the non-rotating airborne radar antenna cover based on the point cloud data of the surface configuration lines and the surface guide lines.

[0075] Specifically, in one implementation, reconstructing the port configuration line and the surface guide line of the non-rotating airborne radar antenna cover based on the point cloud data of the surface configuration line and the surface guide line may include: reconstructing C1 and C2 based on the point cloud data of C1 and C2, and reconstructing C1 and C2 based on the point cloud data of L c , L d , L a and L b The point cloud data are reconstructed into L c , L d , L a , L b .

[0076] In another implementation, reconstructing the port configuration line and the surface guide line of the non-rotational airborne radar antenna cover based on the point cloud data of the surface configuration line and the surface guide line may include: reconstructing C1 and C2 based on the point cloud data of C1 and C2, and reconstructing C1, 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 Here, L n The additional shape guide line includes a shape guide line located at L a The surface guide lines on both sides and the L b The shape guide lines on both sides, these additional shape guide lines and L a , L b One end of each is connected to the port configuration line, and the other end is gathered at the tip of the upper and lower surfaces. Here, by adding the upper and lower surface ridge line guide line L n The number of can more accurately control the curvature of the upper and lower surfaces, and achieve accurate characterization of the non-rotating airborne radar antenna cover surface.

[0077] Therefore, the shape S of the non-rotating 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, α and β are both proportional factors.

[0080] Figure 3 A schematic diagram of reconstructing the port configuration lines and surface guide lines of a non-rotating airborne radar antenna cover based on point cloud data of the surface configuration lines and surface guide lines is shown, wherein the discrete points are points whose three-dimensional coordinates can be obtained through step S101. Based on these discrete points, complete port configuration lines and surface guide lines 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 guide line as the surface shape control curve, a multi-section surface construction method is used to reconstruct the non-rotating airborne radar antenna cover surface.

[0082] Specifically, a multi-section surface is constructed based on the port configuration line and the surface guide line to generate Figure 4 The upper and lower shapes shown in the figure are used to construct the cavity model, and the cavity model is combined with the base model ( Figure 4 ) to perform Boolean operations, and finally generate Figure 5 The non-rotating airborne radar antenna cover surface is shown in sub-figure (c) in FIG.

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

[0084] S103, performing solid modeling of the non-rotating airborne radar radome based on the reconstructed non-rotating airborne radar radome-shaped surface.

[0085] That is, the radome solid modeling is realized based on the radome-shaped surface to form a digital model of the non-rotating airborne radar radome.

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

[0087] Table 2

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

[0089] S20. Based on the digital model of the non-rotating airborne radar radome, a frequency selective surface of the non-rotating airborne radar radome is generated.

[0090] It is understandable that for a rotating airborne radar antenna cover, the center coordinates of each frequency selection unit can be calculated by a polar coordinate system on the same latitude plane. However, for a non-rotating airborne radar antenna cover, the curvature of each latitude on the same latitude plane changes, making it difficult to calculate the center coordinates of each frequency selection unit.

[0091] Therefore, in the embodiment of the present invention, based on the digital model of the non-rotating airborne radar radome, the frequency selective surface of the non-rotating airborne radar radome is generated, including the steps S201 to S203:

[0092] S201. Determine the starting position of each frequency selection cycle on the surface edge guide line of the non-rotating airborne radar antenna cover surface.

[0093] For details, see Figure 7 , Figure 7 It is the edge guide line L of the non-rotating airborne radar radome c With L d The plane determined is on the edge guide line (L c or L d ) determines the starting position of each frequency selection cycle, including steps S2011 to S2014:

[0094] S2011, on the center line L of the non-rotating airborne radar radome m The first auxiliary point P1 and the second auxiliary point P2 are marked on.

[0095] Here, the first auxiliary point P1 is based on the center line L m The distance between the frequency selection starting position on the non-rotating airborne radar antenna cover and the vertex P0 is determined, and the second auxiliary point P2 is determined according to the center line L m The distance between the frequency selection cut-off position on the non-rotating airborne radar antenna cover and the end center point P3 is determined; in practice, the center line L m The distance between the frequency selection starting position and P0 and the center line L m The distance between the frequency selection cut-off position and P3 is given by the designer of the airborne radar antenna cover.

[0096] S2012, P1 and P2 along the center line L m The normal direction is projected to the surface edge guide line (L c or L d ) to obtain the surface edge guide 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 shape to guide the line Divide by the spacing D of the starting positions of the frequency selection cycle y , and the calculation results Round to get the frequency selection cycle number Num' y .

[0099] S2014. According to the number of frequency selection cycles, determine the starting position of each frequency selection cycle on the surface edge guide line.

[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 the cycles of the frequency, the line L can be guided along the edge of the surface. c Determine the starting position point N of each frequency selection cycle in turn i , 1≤i≤Num' y .

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

[0102] Specifically, the frequency selection units are usually arranged on the non-expandable surface in a certain spatial rule 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. An 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, such as Figure 8 shown.

[0103] S203, determining 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 position of each frequency selection period on the surface edge guide line and each isoparametric curve, the number of frequency selection units and the center position of each frequency selection unit are determined, including S2031-S2032:

[0105] S2031. For each isoparametric curve, use its length l i Divided by the frequency selective unit array spacing D x , and round the calculated result to get the number of frequency selective units on the parameter curve.

[0106] See also Figure 8 , let point N i The isoparametric curve determined for the independent variable is Measuring isoparametric curves The length of the curve is l i , assuming that the spacing of the frequency selective units on the same latitude is D x , by D x and l i The isoparametric curve can be obtained The theoretical number of frequency selection units is:

[0107]

[0108] Then, take for An integer value, and Is an isoparametric curve The actual number of frequency selection units.

[0109] S2032, determining 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 the number of frequency selection units on each isoparametric curve.

[0110] Specifically, given isoparametric curves Theoretical number of frequency selective units The isoparametric curve The actual distance between the centers of the frequency selection units is:

[0111]

[0112] Therefore, the surface edge guide line L c The starting point N of each frequency selection cycle i is the reference point of the corresponding frequency selection unit. For the array spacing, the non-rotating airborne radar antenna cover surface is divided into units, thereby determining the number of frequency selective units and the center position of each frequency selective unit, such as Figure 8 shown.

[0113] S204, generating a frequency selective surface of a non-rotating airborne radar antenna cover according to the center position of each frequency selective unit.

[0114] For details, see Fig. 9 , for the center position of each frequency selective unit, a tangent plane of the non-rotational metal frequency selective substrate surface of the digital model of the non-rotational airborne radar antenna cover is made through the center position, and the frequency selective unit plane modeling is performed on the tangent plane to obtain a plane model, and then the modeled plane frequency selective unit is mapped to the non-rotational metal frequency selective layer substrate, that is, the plane model is first mapped to the space model, and then the space model is mapped to the non-rotational metal frequency selective layer substrate, so as to obtain a non-rotational frequency selective unit (FSS model); this mapping process is as follows Fig. 9 Thus, when all frequency selection units are mapped to the non-rotational metal frequency selection layer substrate, the frequency selection surface of the non-rotational airborne radar antenna cover can be obtained.

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

[0116] Table 3

[0117]

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

[0119] In summary, the non-rotating airborne radar radome modeling method provided by the present invention first performs surface configuration on the non-rotating airborne radar radome to obtain a reconstructed non-rotating airborne radar radome surface, and then generates a frequency selective surface of the non-rotating airborne radar radome based on the non-rotating airborne radar radome surface. Compared with the design method of the non-rotating airborne radar radome based on the ideal digital model of the infinitely large loading plane and the infinitely thin loading metal layer in the prior art, the present invention effectively improves the modeling accuracy of the non-rotating airborne radar radome. The non-rotating airborne radar radome modeling method provided by the embodiment of the present invention can be widely used in the creation of a digital model of a non-rotating FSS radome for an aircraft platform, and can enable the final designed radome product to achieve the originally 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 are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, 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. Instead, 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 conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0122] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art can understand and implement other changes to the disclosed embodiments by viewing the drawings and the disclosed content. In the description of the present invention, the term "comprising" does not exclude other components or steps, "one" or "an" does not exclude multiple situations, and "multiple" means two or more, unless otherwise clearly and specifically limited. In addition, certain measures are recorded in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0123] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for modeling a non-rotating airborne radar radome, characterized in that: include: The non-rotating airborne radar radome is subjected to surface configuration and entity modeling to obtain a reconstructed digital model of the non-rotating airborne radar radome; Based on the digital model of the non-rotating airborne radar radome, a frequency selective surface of the non-rotating airborne radar radome is generated.

2. The method for modeling a non-rotating airborne radar radome according to claim 1, characterized in that: The surface configuration and entity modeling of the non-rotating airborne radar radome includes: Obtain point cloud data of the solid surface of the non-rotating airborne radar radome; Reconstructing the shape of a non-rotating airborne radar radome based on the point cloud data; Solid modeling of non-rotating airborne radar radome is carried out based on the reconstructed non-rotating airborne radar radome surface.

3. The method for modeling a non-rotating airborne radar radome according to claim 2, characterized in that: Before performing the solid modeling, the method further includes: Editing and optimizing the reconstructed non-rotational airborne radar radome-shaped surface so that the optimized non-rotational airborne radar radome-shaped surface conforms to the shape of the non-rotational airborne radar radome entity; Verify the geometric dimensions and functions of the optimized non-rotating airborne radar antenna cover surface.

4. The method for modeling a non-rotating airborne radar radome according to claim 3, characterized in that: The surface reconstruction of the non-rotating airborne radar radome based on the point cloud data comprises: Acquire three views of the non-rotating airborne radar radome, and construct a wireframe model of the non-rotating airborne radar radome based on the three views; Extracting point cloud data of the surface configuration lines and surface guide lines of the non-rotating airborne radar radome based on the wireframe model; Reconstructing the port configuration lines and the shape surface guide lines of the non-rotational airborne radar radome based on the point cloud data of the shape surface configuration lines and the shape surface guide lines; The port configuration line is used as a cross-sectional shape control curve, and the surface guide line is used as a surface shape control curve, and a multi-section curved surface construction method is used to reconstruct the non-rotating airborne radar antenna cover surface.

5. The method for modeling a non-rotating airborne radar radome according to claim 4, characterized in that: The wireframe model includes: two port configuration lines C1 and C2, two surface edge guide lines L c and L d , upper surface ridge guide line L a and the lower ridge line guide line L b ; Reconstructing the port configuration line and the shape surface guide line of the non-rotational airborne radar radome based on the point cloud data of the shape surface configuration line and the shape surface guide line includes: Reconstruct C1 and C2 based on the point cloud data of C1 and C2; Based on C1, 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 a shape guide line located at L a The surface guide lines on both sides and the L b Surface guide lines on both sides.

6. The method for modeling a non-rotating airborne radar radome according to claim 2, characterized in that: The method of generating a frequency selective surface of the non-rotating airborne radar radome based on the digital model of the non-rotating airborne radar radome comprises: Determining the starting position of each frequency selection cycle on the surface edge guide line of the non-rotating airborne radar radome surface; According to the starting position of each frequency selection cycle, an isoparametric curve parallel to the port configuration line of the non-rotating airborne radar radome-shaped surface is constructed on the surface of the non-rotating airborne radar radome-shaped surface; 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 edge guide line of the surface and each isoparametric curve; According to the center position of each frequency selective unit, the frequency selective surface of the non-rotating airborne radar antenna cover is generated.

7. The method for modeling a non-rotating airborne radar radome according to claim 6, characterized in that: The step of determining the starting position of each frequency selection cycle on the surface edge guide line of the non-rotating airborne radar radome surface comprises: Marking a first auxiliary point P1 and a second auxiliary point P2 on the center line of the non-rotating airborne radar antenna cover-shaped surface; the first auxiliary point P1 is determined according to the distance between the frequency selection starting position on the center line and the vertex of the non-rotating airborne radar antenna cover-shaped surface, and the second auxiliary point P2 is determined according to the distance between the frequency selection cut-off position on the center line and the end center point of the non-rotating airborne radar antenna cover-shaped surface; Project P1 and P2 along the normal direction of the center line onto the surface edge guide line to obtain a frequency selection starting position P1' and a frequency selection ending position P2' on the surface edge guide line; Determine the frequency selection cycle number according to the line length between P1' and P2' on the surface edge guide line; According to the number of frequency selection cycles, the starting position of each frequency selection cycle is determined on the surface edge guide line.

8. The method for modeling a non-rotating airborne radar radome according to claim 7, characterized in that: The step of determining the number of frequency selection cycles according to the line length between P1' and P2' on the surface edge guide line comprises: The line length between P1' and P2' on the edge guide line of the surface is divided by the spacing D of the starting positions of the frequency selection cycle. y , and round the calculated result to get the frequency selection cycle number.

9. The method for modeling a non-rotating airborne radar radome according to claim 6, characterized in that: The step of determining 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 comprises: For each isoparametric curve, use its length l i Divided 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; The number of frequency selection units and the center position of each frequency selection unit are determined according to the starting position of each frequency selection period on the surface edge guide line and the number of frequency selection units on each isoparametric curve.

10. The method for modeling a non-rotating airborne radar radome according to claim 9, characterized in that: The method of generating a frequency selective surface of a non-rotating airborne radar antenna cover according to the center position of each frequency selective unit comprises: For the center position of each frequency selection unit, a tangent plane of the non-rotational metal frequency selection substrate surface of the digital model of the non-rotational airborne radar antenna cover is made through the center position, and the frequency selection unit plane modeling is performed on the tangent plane, and then the modeled plane frequency selection unit is mapped to the non-rotational metal frequency selection layer substrate; When all frequency selection units are mapped to the non-rotational metal frequency selection layer substrate, a frequency selection surface of a non-rotational airborne radar antenna cover is obtained.

Images