A top hat structure to extend the pitch bistatic angle range

Abstract

The application relates to a top hat structure for extending the range of pitch bistatic angle, which comprises a disc and a plurality of coaxially arranged and integrally connected circular truncated cones, the plurality of circular truncated cones are coaxial with the disc, the lower bottom surface of the lowermost circular truncated cone is connected with the disc, the included angle between the generatrix of the lowermost circular truncated cone and the disc is between 90 DEG and 92 DEG, the included angle between the generatrix of each circular truncated cone from bottom to top and the disc is sequentially increased, the increase of the included angle between the generatrix of adjacent two circular truncated cones and the disc is not more than 1 DEG, the radius of the lower bottom surface of each circular truncated cone is larger than the radius of the upper bottom surface, in the adjacent two circular truncated cones, the radius of the upper bottom surface of the lower circular truncated cone is equal to the radius of the lower bottom surface of the upper circular truncated cone. The coaxial stacking of the plurality of circular truncated cones with different inclination angles and sizes and the integral connection with the disc with different radii can have strong electromagnetic scattering characteristics in a larger range of pitch bistatic angle, can realize the control of strong scattering characteristics in a larger range of pitch bistatic angle, and can provide technical support for subsequent bistatic target simulation research.

Description

Technical Field

[0001] This invention relates to the field of radar target technology, and in particular to a top cap structure that extends the range of both elevation and dual-angle positions. Background Technology

[0002] Radar targets are designed to approximate and equivalently simulate the characteristics of targets relevant to weapon systems in their search, acquisition, tracking, countermeasure, and attack operations. They serve as the prerequisite and foundation for the evaluation and testing of weapon systems and guidance systems. The radar target is the smallest component of a radar target system, providing a simulation of the target's point scattering characteristics.

[0003] With the increasing complexity of battlefield environments and the improved stealth capabilities of targets, traditional weapon systems face severe challenges. Bistatic (multistatic) radar detection can significantly improve the identification and anti-jamming capabilities of stealth targets, effectively increasing the probability of successful attacks. To achieve precision strikes, increasingly higher demands are placed on weapon system seekers; therefore, research on bistatic (multistatic) radar guidance systems is a key development direction.

[0004] As a type of radar target, the top-cap structure is traditionally a cylindrical object of equal diameter perpendicular to the disk. It exhibits strong electromagnetic scattering characteristics only at an elevation bistatic angle of 0°, but the scattering intensity rapidly decreases as the elevation bistatic angle increases. In contrast, the scattering intensity of a real target, while weakening after changes in elevation bistatic angle, still maintains a certain level. Therefore, there is an urgent need to design a top-cap structure that can maintain strong electromagnetic scattering characteristics over a wider range of elevation bistatic angles. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a top cap structure that extends the pitch and bi-angle range, and to solve the problem that existing top cap structures only have strong electromagnetic scattering characteristics when the pitch and bi-angle are 0°.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides a top cap structure that extends the range of pitch and angle, characterized in that: it includes a disk and multiple truncated cones coaxially arranged and integrally connected, the multiple truncated cones are coaxial with the disk and the lower bottom surface of the lowermost truncated cone is connected to the disk, the angle between the generatrix of the lowermost truncated cone and the disk is between 90° and 92°, and the angle between the generatrix of each truncated cone and the disk increases sequentially from bottom to top, the increase in the angle between the generatrix of two adjacent truncated cones and the disk does not exceed 1°, the radius of the lower bottom surface of each truncated cone is greater than the radius of the upper bottom surface, and in two adjacent truncated cones, the radius of the upper bottom surface of the lower truncated cone is equal to the radius of the lower bottom surface of the upper truncated cone.

[0009] Optionally, the ratio of the radius of the lower base of the frustum located at the bottom to the radius of the disk is 0.25 to 0.35.

[0010] Optionally, the heights of the multiple frustums are equal.

[0011] Optionally, there are five frustums, which are arranged from bottom to top as the first frustum, the second frustum, the third frustum, the fourth frustum and the fifth frustum, and the angles between the generatrices of the first frustum to the fifth frustum and the disk are 91°, 92°, 93°, 94° and 95° respectively.

[0012] Optionally, the lower base radius of the first frustum is 0.6m, the upper base radius of the fifth frustum is 0.5m, and the height of each frustum is 0.36m.

[0013] Optionally, the radius of the disk is 2m.

[0014] (III) Beneficial Effects

[0015] The above-mentioned technical solution of the present invention has the following advantages: The top cap structure for extending the pitch bi-angle range provided by the present invention includes a disk and multiple coaxially arranged and integrally connected frustums. The multiple frustums are coaxial with the disk, and the lower bottom surface of the lowermost frustum is connected to the disk. The angle between the generatrix of the lowermost frustum and the disk is between 90° and 92°, and the angle between the generatrix of each frustum and the disk increases sequentially from bottom to top. The increase in the angle between the generatrix of two adjacent frustums does not exceed 1°. The radius of the lower bottom surface of each frustum is greater than the radius of the upper bottom surface. Among two adjacent frustums, the radius of the upper bottom surface of the lower frustum is equal to the radius of the lower bottom surface of the upper frustum. By coaxially stacking multiple frustums with different tilt angles and sizes and integrally connecting them with disks of different radii, strong electromagnetic scattering characteristics can be achieved over a wider range of pitch bi-angles. Strong scattering characteristic control can be realized over a wider range of pitch bi-angles, providing technical support for subsequent bi-station target simulation research. Attached Figure Description

[0016] The accompanying drawings are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not be consistent with the actual product.

[0017] Figure 1 This is a side view of a top cap structure that extends the pitch dual-angle range according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Top view of the top cap structure;

[0019] Figure 3 yes Figure 2 Enlarged diagram of part A in the diagram;

[0020] Figure 4 yes Figure 1 Another structural diagram of the top cap structure;

[0021] Figure 5 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at elevation bistatic angle of 0° and azimuth bistatic angle of 30°.

[0022] Figure 6 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at elevation bistatic angle of 0° and azimuth bistatic angle of 60°.

[0023] Figure 7 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at elevation bistatic angle of 0° and azimuth bistatic angle of 90°.

[0024] Figure 8 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 0° and an azimuth bistatic angle of 120°.

[0025] Figure 9 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 5° and an azimuth bistatic angle of 30°.

[0026] Figure 10 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 5° and an azimuth bistatic angle of 60°.

[0027] Figure 11 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 5° and an azimuth bistatic angle of 90°.

[0028] Figure 12 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 5° and an azimuth bistatic angle of 120°.

[0029] Figure 13 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 10° and an azimuth bistatic angle of 30°.

[0030] Figure 14The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 10° and an azimuth bistatic angle of 60°.

[0031] Figure 15 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and its RCS spatial distribution at an elevation bistatic angle of 10° and an azimuth bistatic angle of 90°.

[0032] Figure 16 The embodiment of the present invention provides a top cap structure using Ku band and horizontal (HH) polarization, and the RCS spatial distribution diagram under elevation bistatic angle of 10° and azimuth bistatic angle of 120°.

[0033] In the picture:

[0034] 1: Disk; 2: First frustum; 3: Second frustum; 4: Third frustum; 5: Fourth frustum; 6: Fifth frustum. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides a top cap structure for extending the pitch and angle range, comprising a disk and multiple coaxially arranged and integrally connected frustums. The frustums are coaxially stacked and integrally connected, with the lowest frustum coaxially connected to the disk. The angle between the generatrix of the lowest frustum and the disk is between 90° and 92°, for example, 90°, 90.5°, 91°, 91.5°, 92°, etc. Furthermore, the angle between the generatrix of each frustum and the disk increases sequentially from bottom to top, with the increase in the angle between the generatrix of two adjacent frustums not exceeding 1°. The radius of the lower base of each frustum is greater than the radius of its upper base. In two adjacent frustums, the radius of the upper base of the lower frustum is equal to the radius of the lower base of the upper frustum, and the two adjacent frustums are smoothly connected. This top cap structure, by coaxially stacking multiple frustums with progressively increasing angles between the generatrix and the disk, can exhibit strong electromagnetic scattering characteristics over a wider range of pitch and bi-angle positions. It achieves strong scattering characteristic control within a certain pitch and bi-angle range, solving the problem that existing top cap structures only exhibit strong electromagnetic scattering characteristics when the pitch and bi-angle positions are 0°.

[0037] In some preferred embodiments, the ratio of the radius of the lower base of the lowermost frustum to the radius of the disk is 0.25 to 0.35, for example, 0.25, 0.26, 0.28, 0.3, 0.33, 0.35, etc. In one specific embodiment, the ratio of the radius of the lower base of the lowermost frustum to the radius of the disk is 0.3. For example, the radius of the lower base of the lowermost frustum is 0.6m, and the radius of the disk is 2m.

[0038] In some preferred embodiments, the heights of the multiple frustums are equal, and the specific heights can be set as needed and are not limited here.

[0039] See Figures 1-4 As shown, in one specific embodiment, the top-cap structure extending the pitch dual-angle range includes a disk 1 and five frustums. The five frustums, from bottom to top, are a first frustum 2, a second frustum 3, a third frustum 4, a fourth frustum 5, and a fifth frustum 6. The five frustums are coaxially stacked, with the lower base of the first frustum 2 integrally connected to the disk 1. In this embodiment, the radius of the disk 1 is 2m, the radius of the lower base of the first frustum 2 is 0.6m, the radius of the upper base of the fifth frustum is 0.5m, and the height of each frustum is 0.36m. The angles between the generatrix of each frustum (2 to 6) and the disk 1 are α1=91°, α2=92°, α3=93°, α4=94°, and α5=95°, respectively. This is to verify the technical effect of the top-cap structure in this embodiment in exhibiting strong electromagnetic scattering characteristics over a wider pitch dual-angle range. Electromagnetic simulations were performed using this cap structure to obtain the bistatic radar cross section (RCS) characteristics under different fixed elevation and azimuth bistatic angles. The main calculation parameters were Ku-band, horizontal (HH) polarization, incident elevation angle of 10°–80°, incident azimuth angle of -180°–180°, elevation bistatic angles of 0°, 5°, and 10°, and azimuth bistatic angles of 30°, 60°, 90°, and 120°. (See also...) Figures 5-16 The results shown are the simulation calculation results, where, Figures 5-8 The images show the spatial distribution of the RCS (Radio Cross Section) at elevation angles of 0° and azimuth angles of 30°, 60°, 90°, and 120°. Figures 9-12 The images show the spatial distribution of the RCS (Radio Cross Section) at elevation angles of 5° and azimuth angles of 30°, 60°, 90°, and 120°. Figures 13-16 The following are the RCS spatial distribution diagrams for the top cap structure at elevation bi-station angles of 10° and azimuth bi-station angles of 30°, 60°, 90°, and 120°, respectively. The statistical values ​​of the RCS spatial distribution of the top cap structure under different elevation and azimuth bi-station angles are shown in the table below:

[0040]

[0041] Combination Figures 5-16 The table above shows that the top cap structure designed in this invention can achieve strong scattering characteristic control within the range of 0~10° of elevation and bistatic angles.

[0042] This invention employs the method of coaxially stacking multiple frustums of different tilt angles and sizes and integrally connecting them with disks of different radii. This enables strong electromagnetic scattering characteristics over a wider range of pitch and bistatic angles, and allows for strong scattering characteristic control over a larger pitch and bistatic angle range, providing technical support for subsequent bistatic target simulation research.

[0043] It should be noted that electromagnetic theory simulation calculations are existing technologies and will not be elaborated upon here.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution, and in the absence of conflict between solutions, the various technical features mentioned in each embodiment can be combined in any way to form other implementation methods that can be understood by those skilled in the art.

[0045] Furthermore, without departing from the scope of the present invention, modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A top cap structure that extends the pitch and angle range, characterized in that: The device includes a disk and multiple coaxially arranged and integrally connected frustums. The frustums are coaxial with the disk, and the bottom surface of the lowest frustum is connected to the disk. The angle between the generatrix of the lowest frustum and the disk is between 90° and 92°. The angle between the generatrix of each frustum and the disk increases sequentially from bottom to top. The increase in the angle between the generatrix of two adjacent frustums does not exceed 1°. The radius of the bottom surface of each frustum is greater than the radius of its top surface. Among two adjacent frustums, the radius of the top surface of the lower frustum is equal to the radius of the bottom surface of the upper frustum.

2. The top cap structure for extending the pitch dual-angle range according to claim 1, characterized in that: The ratio of the radius of the lower base of the frustum located at the bottom to the radius of the disk is 0.25 to 0.

35.

3. The top cap structure for extending the pitch dual-angle range according to claim 2, characterized in that: The heights of the multiple frustums are equal.

4. The top cap structure for extending the pitch dual-angle range according to claim 3, characterized in that: The number of frustums is five, which are arranged from bottom to top as the first frustum, the second frustum, the third frustum, the fourth frustum, and the fifth frustum. The angles between the generatrices of the first frustum and the fifth frustum and the disk are 91°, 92°, 93°, 94°, and 95°, respectively.

5. The top cap structure for extending the pitch dual-angle range according to claim 4, characterized in that: The radius of the lower base of the first frustum is 0.6m, the radius of the upper base of the fifth frustum is 0.5m, and the height of the first frustum to the fifth frustum is 0.36m.

6. The top cap structure for extending the pitch dual-angle range according to claim 5, characterized in that: The radius of the disk is 2m.

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