CN212342825U

CN212342825U - Luneberg lens with variable RCS

Info

Publication number: CN212342825U
Application number: CN202021148621.1U
Authority: CN
Inventors: 陈召涛; 章辉; 许盼福
Original assignee: No 60 Institute of Headquarters of General Staff of PLA
Current assignee: No 60 Institute of Headquarters of General Staff of PLA
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-01-12
Anticipated expiration: 2030-06-19

Abstract

The utility model discloses a luneberg lens with variable RCS, which comprises a medium ball, a reflecting surface and an adjusting rod; the dielectric ball is composed of a plurality of dielectric layers with sequentially changed dielectric constants; one end of the adjusting rod is fixedly connected with the reflecting surface, and the other end of the adjusting rod is connected with the driving mechanism; the adjusting rod is controlled by the driving mechanism to move so as to drive the reflecting surface to move, and the RCS characteristic of the luneberg ball is adjusted by changing the relative positions of the multilayer medium ball and the reflecting surface; the utility model changes the relative position of the multilayer medium ball and the reflecting surface to generate the change of the luneberg lens RCS; the variable RCS Luneberg lens can be used in cooperation with a target needing to change the RCS, and is also suitable for various occasions needing to adjust the RCS.

Description

Luneberg lens with variable RCS

Technical Field

The utility model belongs to the technical field of the antenna, especially a changeable RCS's luneberg lens.

Background

RCS (radar cross section) characterizes the echo intensity of the target under radar wave illumination. At present, there are two main methods, namely active radar intensifier and passive intensification, in which the active radar intensifier amplifies the power of the received radio frequency signal and then radiates the signal through an antenna to increase and adjust the RCS. Passive radar enhancements typically include: the corner reflector is a rigid structure generally composed of mutually perpendicular metal surfaces, the luneberg lens is a dielectric lens taking a spherical shape as a basic shape, electromagnetic waves are converged and reflected by a metal reflecting surface on the surface of the sphere, and the luneberg lens is an efficient and low-cost RCS enhanced reflector.

Chinese patent CN107037407A corner reflector with adjustable width of RCS main lobe azimuth realizes the control of azimuth width by adding an azimuth width adjusting plate on the traditional corner reflector structure, but the maximum RCS value in azimuth can not be changed, and only the azimuth width is changed. Chinese patent CN209182498U "an active enhancer of RCS with controllable gain" discloses an active enhancer of RCS with controllable gain, which includes a control module and enhancers corresponding to a plurality of different wave bands, each enhancer further includes mechanisms such as a controllable gain amplifying link, a coupler, a receiving antenna and a transmitting antenna. The active intensifier simulates the RCS size change of a target at different incidence angles by adjusting the gain of the intensifier in real time, but the system is overall complex and expensive.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a changeable RCS's luneberg lens to realize RCS's change.

Realize the utility model discloses the technical solution of purpose does:

a luneberg lens of variable RCS, including medium ball, reflecting surface and regulating lever; the dielectric ball is composed of a plurality of dielectric layers with sequentially changed dielectric constants; one end of the adjusting rod is fixedly connected with the reflecting surface, and the other end of the adjusting rod is connected with the driving mechanism; the adjusting rod is controlled by the driving mechanism to move, so that the reflecting surface is driven to move, and the RCS characteristic of the luneberg ball is adjusted by changing the relative position of the multilayer medium ball and the reflecting surface.

Compared with the prior art, the utility model, it is showing the advantage and is:

the utility model discloses a change multilayer medium ball and the change of plane of reflection relative position, produced the change of luneberg lens RCS. The variable RCS Luneberg lens can be used in cooperation with a target needing to change the RCS, and is also suitable for various occasions needing to adjust the RCS.

Drawings

Fig. 1 is a view of a luneberg lens.

Fig. 2 is a side view of the luneberg lens with the reflective surface not moved.

Fig. 3 is a moving back side view of the reflective surface of the luneberg lens.

FIG. 4 is a comparison of RCS before and after the movement of the reflecting surface of the Luneberg lens.

In the figure, 1-inner dielectric layer, 2-middle dielectric layer, 3-outer dielectric layer, 4-reflecting surface and 5-adjusting rod

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

With reference to fig. 1-4, the luneberg lens with variable RCS of the present invention includes a dielectric sphere, a reflective surface 4 and an adjusting rod 5; the medium ball can be connected to targets such as unmanned aerial vehicles, ships and warships through the clamp, and can also be connected to the targets through gluing. The dielectric ball is composed of a plurality of dielectric layers with sequentially changed dielectric constants. One end of the adjusting rod 5 is fixedly connected with the reflecting surface 4, the other end of the adjusting rod is connected with the steering engine, the adjusting rod 5 is controlled by the steering engine to move, so that the reflecting surface 4 is driven to move, and the RCS characteristic of the luneberg ball is adjusted by changing the relative position of the multilayer medium ball and the reflecting surface 4.

The medium ball comprises foaming material polyurethane, and reflecting surface 4 is the metal covering, adjusts pole 5 and is the fine combined material pole of glass, possesses strong penetrability of electromagnetic wave. The reflecting surface 4 is fixedly connected with an adjusting rod 5, the movement of the adjusting rod 5 is controlled by a steering engine, and the reflecting surface 4 moves along the axial direction of the adjusting rod 5.

In this embodiment, the dielectric sphere is a three-layer dielectric sphere, and the dielectric sphere is composed of an inner dielectric layer 1, a middle dielectric layer 2, and an outer dielectric layer 3. According to LongboAccording to the design rule of the lens layered dielectric sphere, incident parallel waves pass through a dielectric layer and then are focused on a reflecting surface, so that a larger RCS is obtained, and the dielectric constant distribution is as follows: 2- (R/R)²R represents the overall size of the reflecting surface 4 from the center of the sphere, and R represents the overall size of each layer of the medium from the center of the sphere. According to the formula: when the radius of the sphere is 30mm, 45mm and 65mm in sequence, the initial distance between the reflecting surface and the dielectric sphere is 10mm, the dielectric constant is 1.95, 1.72 and 1.38 in sequence, in the embodiment, the reflecting surface 4 is a spherical surface, the radius of the reflecting surface 4 is initially 75mm, the central angle of the reflecting surface is 120 degrees, and the radius of the reflecting surface can be adjusted according to actual use requirements. The shape of the reflecting surface 4 is not limited to a spherical surface, and may be other types of flat surfaces or curved surfaces.

The distance between the medium ball and the metal reflecting surface 4 is 10mm in the initial state, and the medium ball is composed of 3 layers of foaming materials with different dielectric constants, so that electromagnetic waves are refracted by the medium ball and then converged on the reflecting surface 4, and then strong backscattering is formed.

The reflecting surface 4 can axially move along the adjusting rod 5 within the movement permission range, and the movement numerical value can be controlled by the steering engine. Assuming that the reflecting surface 4 moves 50mm away from the dielectric sphere 3 after moving, the distance between the reflecting surface 4 and the dielectric sphere 3 changes, so that the scattering intensity of the electromagnetic wave changes correspondingly, and the RCS curves before and after moving are shown in fig. 4.

Taking fig. 2 as an example, it is specified that the electromagnetic wave is incident horizontally, the direction of incidence is 0 ° when the incident direction is aligned with the center of the reflecting surface 4, and the counterclockwise rotation direction is positive when the luneberg lens is viewed in plan. The curve shown in fig. 4 is that the incident frequency point is 10GHz, the pitch angle of the luneberg lens is 0 °, when the reflecting surface 4 moves horizontally by 50mm in the direction away from the dielectric sphere 3, both the RCS scattering intensity and the strong scattering area of the luneberg lens change, the RCS intensity of the luneberg lens is weakened after the movement, and the strong scattering area is also reduced.

Claims

1. The luneberg lens of a variable RCS, characterized by, including medium ball, reflecting surface (4) and regulating lever (5); the dielectric ball is composed of a plurality of dielectric layers with sequentially changed dielectric constants; one end of the adjusting rod (5) is fixedly connected with the reflecting surface (4), and the other end of the adjusting rod is connected with the driving mechanism; the adjusting rod (5) is controlled to move through the driving mechanism, so that the reflecting surface (4) is driven to move, and the RCS characteristic of the luneberg ball is adjusted by changing the relative position of the multilayer medium ball and the reflecting surface (4).

2. The luneberg lens of claim 1, wherein said dielectric sphere is comprised of polyurethane foam.

3. The luneberg lens of variable RCS of claim 1, wherein the adjusting lever (5) is a fiberglass composite lever.

4. A luneberg lens of variable RCS according to claim 1, wherein said reflecting surface (4) is a metal surface.

5. The luneberg lens of variable RCS of claim 1, wherein said dielectric sphere is composed of an inner dielectric layer (1), an intermediate dielectric layer (2), an outer dielectric layer (3); the dielectric constant distribution is: 2- (R/R)²R represents the overall size of the reflecting surface 4 from the center of the sphere, and R represents the overall size of each layer of the medium from the center of the sphere.

6. A luneberg lens of variable RCS according to claim 1, wherein said reflecting surface (4) is spherical, planar or curved.

7. The luneberg lens of claim 1, wherein said drive mechanism is a steering engine.