Millimeter wave radar corner reflector

Abstract

The utility model relates to a millimeter wave radar corner reflector, which is applied to the technical field of intelligent driving, and comprises one or more corner reflector units, each corner reflector unit comprises three reflecting surfaces which are perpendicular to one another, and the three reflecting surfaces comprise a bottom reflecting surface and two side reflecting surfaces; the bottom reflecting surface is an isosceles right triangle, and the two side reflecting surfaces are rectangles; the corner reflector unit is fixed on the side of a road, and the three reflecting surfaces are used for reflecting received radar signals. The utility model is easy to install, and can increase the radar reflection sectional area of a weak target.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent driving technical field especially relates to a millimeter wave radar corner reflector. BACKGROUND

[0002] With the development of intelligent driving technology, safety equipment is applied more and more widely, and plays an important role in the safety of vehicle driving process. As a kind of safety equipment, millimeter wave radar corner reflector is a device used to reflect radar signals, and its main purpose is to enhance the echo intensity of radar signals and improve the detection accuracy and effective range of radar system. The design principle of corner reflector is based on geometric optics, and its special structure is used to optimize the reflection effect of radar signals.

[0003] The existing corner reflector is mostly used for calibration, as a known reflecting source, to help calibrate the sensitivity and measurement accuracy of radar. Although such calibration corner reflector is not large in size, it is not easy to install in road traffic and is not convenient to use. In addition, when using vehicle-mounted millimeter wave radar for road condition recognition, the radar reflection cross-sectional area (RCS) of obstacles such as road edges, walls and road barrels is very small, and it is difficult to find the target in long-distance detection. SUMMARY

[0004] In order to solve the above technical problems, the utility model provides a millimeter wave radar corner reflector.

[0005] According to one aspect of the utility model, a millimeter wave radar corner reflector is provided, comprising: one or more corner reflector units, the corner reflector unit comprising three mutually perpendicular reflecting surfaces, the three reflecting surfaces comprising: a bottom reflecting surface and two side reflecting surfaces; the bottom reflecting surface is an isosceles right triangle, and the two side reflecting surfaces are both rectangles.

[0006] The length of the two edges perpendicular to each other in the bottom reflecting surface is 100mm, and the length of one edge of the two side reflecting surfaces is 100mm and the length of the other edge is 20mm.

[0007] The corner reflector unit is fixed on the road edge, and the three reflecting surfaces are all used for reflecting the received radar signals.

[0008] Optionally, the number of corner reflector units is four; the bottom surface of the four corner reflector units constitutes a square, and the side surface of the four corner reflector units constitutes a cross; the four corner reflector units are integrally formed.

[0009] Optionally, the millimeter wave radar corner reflector adopts precision machining process without welding and is integrally formed.

[0010] Optionally, the processing material of the millimeter wave radar corner reflector is an aluminum alloy material, and the surface roughness Ra of the processing material is 1.6 um.

[0011] Optionally, the three reflecting surfaces are pasted with reflective film materials.

[0012] Optionally, the reflective film material is a sealed capsule type glass bead structure.

[0013] Optionally, the outer surface at the junction of the two side reflecting surfaces adopts a chamfer design with a chamfer radius of 3 mm, and the inner surface at the junction of the two side reflecting surfaces adopts a chamfer design with a chamfer radius of 5 mm.

[0014] Optionally, the thickness of the three reflecting surfaces is 3 mm.

[0015] Optionally, the corner reflector unit is fixed on the road in a pasting manner.

[0016] Optionally, when the number of corner reflector units is one, one side reflecting surface of the corner reflector unit is close to and parallel to the road edge, and one side reflecting surface is perpendicular to the road edge.

[0017] The technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The corner reflector unit has a small volume and is easy to install. The corner reflector unit includes three mutually perpendicular reflecting surfaces. When receiving a radar signal, the three mutually perpendicular reflecting surfaces can reflect the radar signal multiple times, thereby realizing enhancement of the radar scattering cross section in a wide angle domain. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 A structural schematic view of the millimeter wave radar corner reflector in the embodiment of the present application;

[0022] Figure 2 Another structural schematic view of the millimeter wave radar corner reflector in the embodiment of the present application;

[0023] Figure 3 The test result of the millimeter wave radar corner reflector containing one corner reflector unit in the embodiment of the present application is shown in the following table.

[0024] Figure 4 The test result of the millimeter wave radar corner reflector containing four corner reflector units in the embodiment of the present application is shown in the following table. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0026] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some of the embodiments of the present application, not all the embodiments.

[0027] Referring to Figure 1 , Figure 1 The present application is a kind of millimeter wave radar corner reflector, which comprises one or more corner reflector units 100, and the corner reflector unit 100 comprises three mutually perpendicular reflecting surfaces, and the three reflecting surfaces comprise a bottom reflecting surface 101, a side reflecting surface 102 and a side reflecting surface 103.

[0028] The length of the two edges of the bottom reflecting surface 101 perpendicular to each other is 100 mm, and the length of one edge of the side reflecting surface 102 and the side reflecting surface 103 is 100 mm, and the length of the other edge is 20 mm. Optionally, the thickness of the three reflecting surfaces is 3 mm, so that the millimeter wave radar corner reflector can meet the hardness requirement.

[0029] The corner reflector unit 100 is fixed on the roadside, and the bottom reflecting surface 101, the side reflecting surface 102 and the side reflecting surface 103 are all used for reflecting the received radar signal.

[0030] As can be seen, the volume of the corner reflector unit 100 is small, so it is easy to install to the roadside. The radar signal can be reflected multiple times between the three mutually perpendicular reflecting surfaces, thereby realizing the enhancement of the radar scattering cross section in a wide angle range.

[0031] Optionally, the corner reflector unit can be fixed on the road in a pasting manner. For example, the corner reflector unit can be fixed by using an adhesive. First, the ground is cleaned to ensure that it is dust-free and oil-free. Then, sufficient adhesive is applied to the bottom of the corner reflector unit. Then, the corner reflector unit is placed at the designated position, and a hammer or other tools are used to knock it to make it fixed firmly, thereby solving the problem of difficult installation in road traffic.

[0032] In the embodiments of the present application, the number of corner reflector units can be one or more. For example, the number of corner reflector units can be one, two, or four, etc. The number of corner reflector units can be different, and the installation method can also be different. When the number of corner reflector units is one, one side reflecting surface of the corner reflector unit is close to and parallel to the road edge, and the other side reflecting surface is perpendicular to the road edge. In this way, the side reflecting surface perpendicular to the road edge can better receive the radar signal.

[0033] When the number of corner reflector units is two, one side reflecting surface of each corner reflector unit is close to and parallel to the road edge, and the other side reflecting surface is perpendicular to the road edge. The side reflecting surfaces perpendicular to the road edge of the two corner reflector units coincide.

[0034] Referring to Figure 2 , Figure 2 Another structure of the millimeter wave radar corner reflector in the embodiments of the present application is shown in FIG. 4. The number of corner reflector units is four, which are corner reflector unit 201, corner reflector unit 202, corner reflector unit 203, and corner reflector unit 204. The bottom surfaces of the four corner reflector units form a square, and the side surfaces of the four corner reflector units form a cross. The four corner reflector units are integrally formed. The corner reflector unit can also be fixed by using an adhesive. First, the ground is cleaned to ensure that it is dust-free and oil-free. Then, sufficient adhesive is applied to the bottom of the corner reflector unit. Then, the corner reflector unit is placed at the designated position, and a hammer or other tools are used to knock it to make it fixed firmly, thereby solving the problem of difficult installation in road traffic.

[0035] Referring to Figure 3 and Figure 4 , Figure 3 The millimeter wave radar corner reflector in the above embodiments achieves the enhancement of the radar scattering cross section in a wide angle range of 20° to 70°, and the radar scattering cross section can all reach more than 0 dBsm. Compared with the corner reflector unit containing one corner reflector unit, Figure 4The millimeter wave radar corner reflector containing four corner reflector units can achieve the enhancement of radar scattering cross section in multiple direction angle domain ranges within a 360° range. In the intelligent driving of an automobile, the detection of the surrounding environment by the vehicle-mounted millimeter wave radar can well achieve the effect of weak target radar scattering cross section enhancement, thereby providing a guarantee for the safety of intelligent driving of the automobile.

[0036] Optionally, the millimeter wave radar corner reflector is integrally formed without welding by using computer numerical control precision machining process. The processing material of the millimeter wave radar corner reflector can be an aluminum alloy material, specifically, an aluminum alloy-7075 material, and the surface roughness Ra of the processing material is 1.6 um. The smooth surface can better increase the radar scattering cross section.

[0037] Optionally, in order to design an aesthetic appearance, the outer surface at the junction of the two side reflecting surfaces can be designed with a chamfer with a chamfer radius of 3 mm; and in order to facilitate processing, the inner surface at the junction of the two side reflecting surfaces is designed with a chamfer with a chamfer radius of 5 mm.

[0038] Optionally, the three reflecting surfaces are pasted with reflective film materials to improve the visibility under night or adverse weather conditions. By pasting a type III reflective film material (high-strength reflective film) on the inner surface of the reflector, the reflective film material can be a sealed capsule type glass bead structure. The reflective film material has a long service life and can be used for permanent traffic signs and work area facilities, so it can be combined with the vehicle-mounted millimeter wave radar corner reflector. When pasting, dust and oil are ensured to be free, a sufficient adhesive is applied to the inner surface of the corner reflector unit, and then a reflective film with the same size as the inner surface of the corner reflector unit is pasted to the inner surface of the corner reflector unit to make it fixed firmly. In this way, the vehicle-mounted millimeter wave radar corner reflector can not only detect weak targets, but also improve the visibility under night or adverse weather conditions, thereby improving traffic safety and being conducive to intelligent traffic management.

[0039] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by“comprises a...” does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0040] The foregoing merely illustrates the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The described embodiments are to be considered in all respects only as illustrative and not restrictive.

Claims

1. A millimeter wave radar corner reflector, characterized by, The application relates to a millimeter wave radar corner reflector, which comprises one or more corner reflector units, the corner reflector unit comprising three mutually perpendicular reflecting surfaces, the three reflecting surfaces comprising one bottom reflecting surface and two side reflecting surfaces; the bottom reflecting surface is an isosceles right triangle, and the two side reflecting surfaces are both rectangles; the length of two mutually perpendicular edges of the bottom reflecting surface is 100 mm, one edge of the two side reflecting surfaces is 100 mm, and the other edge is 20 mm; the three reflecting surfaces are all used for reflecting received radar signals. The number of the corner reflector units is four; the bottom surfaces of the four corner reflector units form a square, and the side surfaces of the four corner reflector units form a cross; the four corner reflector units are integrally formed. The millimeter wave radar corner reflector is integrally formed without welding through a precision machining process. The processing material of the millimeter wave radar corner reflector is an aluminum alloy material, and the surface roughness Ra of the processing material is 1.6 um. The three reflecting surfaces are all pasted with reflective film materials.

2. The millimeter-wave radar corner reflector of claim 1, wherein, The reflective film material is a sealed capsule type glass bead structure.

3. The millimeter-wave radar corner reflector of claim 1, wherein, The outer surface of the junction of the two side reflecting surfaces is designed with a chamfer, and the chamfer radius is 3 mm; the inner surface of the junction of the two side reflecting surfaces is designed with a chamfer, and the chamfer radius is 5 mm.

4. The millimeter-wave radar corner reflector of claim 3, wherein, The thickness of the three reflecting surfaces is all 3 mm.

5. The millimeter-wave radar corner reflector of claim 1, wherein, The corner reflector unit is fixed on the road in a pasting mode.

6. The millimeter-wave radar corner reflector of claim 5, wherein, When the number of the corner reflector units is one, one side reflecting surface of the corner reflector unit is close to and parallel to the road edge, and the other side reflecting surface is perpendicular to the road edge.

7. The millimeter-wave radar corner reflector of claim 1, wherein, ​ 8. The millimeter-wave radar corner reflector of claim 1, wherein, ​ 9. The millimeter-wave radar corner reflector of claim 1, wherein, ​ 10. The millimeter-wave radar corner reflector of claim 1, wherein, ​

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