CN221668013U - High-resolution 4D radar microwave testing device - Google Patents

Abstract

The utility model relates to the technical field of millimeter wave radar testing, in particular to a high-resolution 4D radar microwave testing device which comprises a shielding chamber, a turntable, millimeter wave radars, an angle detection assembly and an index distance measurement assembly, wherein the length of the shielding chamber is far greater than 6.3 meters, a wave absorbing material is adhered to the inner wall of the shielding chamber, the turntable is arranged on one side of the shielding chamber, the millimeter wave radars are arranged on the turntable, the angle detection assembly is arranged on one side of the shielding chamber far away from the turntable and used for detecting the angle resolution of the millimeter wave radars, and the index distance measurement assembly is arranged between the turntable and the angle detection assembly and used for measuring the index distance resolution of the millimeter wave radars. Through the bigger with the shielding room design, mutually supporting between angle detection subassembly and the index distance measurement subassembly to realize the accurate measurement to millimeter wave radar angle resolution and the target distance resolution, reduced measuring error, also reduced the cost of test.

Description

A high-resolution 4D radar microwave test device

Technical Field

The utility model relates to the technical field of millimeter wave radar testing, in particular to a high-resolution 4D radar microwave testing device.

Background Art

In recent years, the promotion of millimeter-wave radar sensors in the automotive field has increased significantly, and it has now become one of the main sensors for automobiles. The unique advantage of millimeter-wave radar in working all day and all weather makes it superior to sensors such as vehicle-mounted optical cameras and lidars. In addition, compared with lidars, its price is also cheaper. The disadvantage of low angular resolution of vehicle-mounted millimeter-wave radars in the past has also been properly solved by the emergence of 4D millimeter-wave radars in recent years. The emergence of 4D millimeter-wave radars solves the shortcomings of traditional millimeter-wave radars with low horizontal angular resolution and lack of height measurement capabilities, making millimeter-wave radars almost as effective as lidars. With the advancement and development of technology, the angular resolution of 4D millimeter-wave radars has been greatly improved, and its angular resolution can reach about 1°. For 4D millimeter-wave radar microwave testing, the industry standard recommends using a target simulator as a simulated target, which has a small aperture effect. However, target simulators are expensive. In the early stages, low-cost corner reflectors were mostly used to detect radar resolution. According to the "Performance Requirements and Test Methods for Vehicle-mounted Millimeter-wave Radars", a target with an RCS (radar scattering cross-section) of 10dBsm is required to perform an angular resolution test. Existing devices that use corner reflectors to detect millimeter-wave radars have inaccurate measurements of angular resolution and large errors, and can no longer meet current requirements.

Utility Model Content

The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

The technical problem to be solved by the utility model is that the existing device for detecting radar resolution by using a corner reflector has an inaccurate measurement of angle resolution and a large error.

To solve the above technical problems, the utility model provides the following technical solutions: a high-resolution 4D radar microwave testing device, comprising a shielding room, a turntable, a millimeter-wave radar, an angle detection component and an index distance measurement component, the length of the shielding room is much greater than 6.3 meters, and absorbing materials are pasted on the inner wall of the shielding room to fully absorb electromagnetic waves, reduce reflected or scattered waves as much as possible, and simulate free space. The turntable is arranged on one side of the shielding room, and the millimeter-wave radar is arranged on the turntable to adjust the angle of the millimeter-wave radar in the azimuth plane and the pitch plane. The angle detection component is arranged on the side of the shielding room away from the turntable to detect the angle resolution of the millimeter-wave radar, and the index distance measurement component is arranged between the turntable and the angle detection component to measure the index distance resolution of the millimeter-wave radar.

As a preferred solution of the high-resolution 4D radar microwave testing device described in the utility model, wherein: the angle detection component includes an arc guide rail, a bracket one, a bracket two, a simulated target one and a simulated target two, the arc guide rail is an arc with the millimeter wave radar as the center, the arc guide rail is arranged on the side of the shielding room away from the turntable, the bracket one and the bracket two are arranged on the arc guide rail, the simulated target one and the simulated target two are arranged on the bracket one and the bracket two respectively, so as to realize the accurate measurement of the angle resolution of the millimeter wave radar.

As a preferred solution of the high-resolution 4D radar microwave testing device described in the utility model, wherein: the index distance measurement component includes a linear guide rail, a bracket three, a bracket four, a simulated target three and a simulated target four, the linear guide rail is longitudinally arranged directly in front of the turntable, the bracket three and the bracket four are arranged on the linear guide rail, the simulated target three and the simulated target four are respectively arranged on the bracket three and the bracket four, so as to realize the accurate measurement of the index distance resolution of the millimeter wave radar.

As a preferred solution of the high-resolution 4D radar microwave testing device of the utility model, the minimum distance between the simulated target three or the simulated target four and the millimeter-wave radar is less than or equal to 0.6 meters to meet the test of the minimum blind spot distance of the millimeter-wave radar.

As a preferred solution of the high-resolution 4D radar microwave testing device described in the utility model, the arc guide rail is marked with scales corresponding to the positions of bracket one and bracket two and simulated target one and simulated target two, which are used for angle calibration of millimeter wave radar.

As a preferred solution of the high-resolution 4D radar microwave testing device of the utility model, wherein: the simulated target one, simulated target two, simulated target three and simulated target four are all corner reflectors, which reduces the cost of millimeter wave radar testing.

As a preferred solution of the high-resolution 4D radar microwave testing device of the utility model, wherein: the bracket one and the bracket two are arc-shaped rods with the millimeter wave radar as the center, so as to better cooperate with the arc guide rail.

Beneficial effect: By designing the shielding room to be larger, the angle detection component and the index distance measurement component cooperate with each other to achieve accurate measurement of the angle resolution and index distance resolution of the millimeter-wave radar, which reduces the measurement error and reduces the cost of testing.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

Figure 1 is a schematic diagram of the overall structure of a high-resolution 4D radar microwave test device.

FIG2 is a side view of a high-resolution 4D radar microwave test device.

FIG3 is a diagram of the simulation parameters of angle resolution detection when two corner reflectors are 1 meter away from the millimeter wave radar.

FIG4 is a diagram of the simulation parameters of the angle resolution detection when the two corner reflectors are 1.5 meters away from the millimeter wave radar.

FIG5 is a diagram of the simulation parameters of the angle resolution detection when the two corner reflectors are 8 meters away from the millimeter wave radar.

In the figure: 1. Shielding room; 2. Millimeter wave radar; 3. Turntable; 4. Simulated target three; 5. Linear guide; 6. Simulated target four; 7. Arc guide; 8. Simulated target one; 9. Simulated target two; 10. Bracket three; 11. Bracket four; 12. Bracket one; 13. Bracket two.

DETAILED DESCRIPTION

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

Example

1 to 5 , the present embodiment provides a high-resolution 4D radar microwave testing device, including a shielding room 1, a turntable 3, a millimeter-wave radar 2, an angle detection component and an index distance measurement component. The length of the shielding room 1 is much greater than 6.3 meters, and an absorbing material is pasted on the inner wall of the shielding room 1. The turntable 3 is arranged on one side of the shielding room 1, and the millimeter-wave radar 2 is arranged on the turntable 3 for adjusting the angle of the millimeter-wave radar 2 in the azimuth plane and the pitch plane. The angle detection component is arranged on the side of the shielding room 1 away from the turntable 3 for detecting the angle resolution of the millimeter-wave radar 2, and the index distance measurement component is arranged between the turntable 3 and the angle detection component for measuring the index distance resolution of the millimeter-wave radar 2.

The shielding room 1 is a rectangular parallelepiped structure as a whole. As the installation basis of the device, the shielding room 1 has a passage that is convenient for entry and exit and does not affect the shielding performance. The length of the shielding room 1 is much greater than 6.3 meters to ensure that it has sufficient size to install the angle detection component. The absorbing material is pasted on the inner wall of the shielding room 1 to fully absorb the electromagnetic waves and reduce the reflected or scattered waves as much as possible to simulate the free space. A turntable 3 is installed in the middle position on the left side of the shielding room 1. The millimeter-wave radar 2 is installed on the turntable 3. The turntable 3 can achieve at least two-dimensional rotational movement to achieve the angle adjustment of the millimeter-wave radar 2 in the azimuth and elevation planes, which is convenient for the millimeter-wave radar In order to align the millimeter-wave radar 2 and adjust different angles for testing, such as antenna radiation diagram and radar power diagram testing, an angle detection component is installed in the middle position on the right side of the shielding room 1, and the angle resolution of the millimeter-wave radar 2 is detected by the angle detection component. An index distance measurement component is installed between the turntable 3 and the angle detection component, and the index distance measurement component is used to measure the index distance resolution of the millimeter-wave radar 2. In this embodiment, the angle detection component and the index distance measurement component cooperate with each other to achieve accurate measurement of the angle resolution and the index distance resolution of the millimeter-wave radar 2, thereby reducing the measurement error and reducing the test cost.

Specifically, the angle detection component includes an arc guide rail 7, a bracket 12, a bracket 2 13, a simulated target 1 8 and a simulated target 2 9. The arc guide rail 7 is an arc with the millimeter wave radar 2 as the center. The arc guide rail 7 is arranged on the side of the shielding room 1 away from the turntable 3. The bracket 1 12 and the bracket 2 13 are arranged on the arc guide rail 7, and the simulated target 1 8 and the simulated target 2 9 are respectively arranged on the bracket 1 12 and the bracket 2 13.

The angle detection component is mainly composed of an arc guide rail 7, a bracket 12, a bracket 2 13, a simulated target 1 8 and a simulated target 2 9. The arc guide rail 7 is an arc with the millimeter wave radar 2 on the turntable 3 as the center. The arc guide rail 7 is installed in the middle position on the right side of the shielding room 1, and the arc guide rail 7 is symmetrical about the middle line of the shielding room 1. Bracket 12 and bracket 2 13 are slidably installed on the arc guide rail 7, so that bracket 12 and bracket 2 13 can perform arc motion along the arc guide rail 7. Simulated target 1 8 and simulated target 2 9 are slidably installed on bracket 1 12 and bracket 2 13 respectively, so that simulated target 1 8 and simulated target 2 9 can move up and down along bracket 1 12 and bracket 2 13, so as to facilitate the adjustment of the height of simulated target 1 8 and simulated target 2 9 on bracket 1 12 and bracket 2 13;

During measurement, when the simulated target 1 8 and the simulated target 2 9 are at the same height and at different positions of the arc guide rail, that is, the simulated target 1 8 and the simulated target 2 9 are at different azimuths relative to the millimeter-wave radar 2, as the simulated target 1 8 and the simulated target 2 9 approach each other, the azimuth angle between the simulated target 1 8 and the simulated target 2 9 becomes smaller and smaller, until the millimeter-wave radar 2 cannot distinguish between the two targets of the simulated target 1 8 and the simulated target 2 9 and only displays them as one target. Then, the millimeter-wave radar 2 can just identify the minimum azimuth angle of the two targets of the simulated target 1 8 and the simulated target 2 9, which is the angular resolution of the millimeter-wave radar 2, thereby realizing accurate measurement of the angular resolution of the millimeter-wave radar 2.

Specifically, the indicator distance measurement component includes a linear guide rail 5, a bracket three 10, a bracket four 11, a simulated target three 4 and a simulated target four 6, the linear guide rail 5 is longitudinally arranged directly in front of the turntable 3, the bracket three 10 and the bracket four 11 are set on the linear guide rail 5, and the simulated target three 4 and the simulated target four 6 are respectively set on the bracket three 10 and the bracket four 11.

The index distance measurement component is mainly composed of a linear guide rail 5, a bracket three 10, a bracket four 11, a simulated target three 4 and a simulated target four 6. The linear guide rail 5 is longitudinally installed in front of the turntable 3 in the shielding room 1, and the bracket three 10 and the bracket four 11 are slidably installed on the linear guide rail 5. The simulated target three 4 and the simulated target four 6 are respectively installed on the bracket three 10 and the bracket four 11, so that the simulated target three 4 and the simulated target four 6 can move along the linear guide rail 5;

When testing the close-range resolution, as the simulated target three 4 and the simulated target four 6 gradually approach, and after they come to a standstill, the output of the millimeter-wave radar 2 is observed until the millimeter-wave radar 2 cannot distinguish between the two targets, the minimum distance at which the millimeter-wave radar 2 can stably identify the two targets is the distance resolution; when the simulated target three 4 or the simulated target four 6 moves along the linear guide rail 5 at a set speed, the recognition of the target speed by the millimeter-wave radar 2 is checked to realize the target simulation test of the specified speed of the millimeter-wave radar 2; when the simulated target three 4 or the simulated target four 6 moves to a position specified by the millimeter-wave radar 2, the result of the detection distance of the millimeter-wave radar 2 and the position setting error of the simulated target three 4 or the simulated target four 6 are checked to realize the detection of the target position accuracy of the millimeter-wave radar 2. This embodiment uses the above detection method to realize the accurate measurement of the index distance resolution of the millimeter-wave radar 2.

Furthermore, the minimum distance between the simulated target three 4 or the simulated target four 6 and the millimeter wave radar 2 is less than or equal to 0.6 meters.

In this embodiment, the minimum distance between the simulated target three 4 or the simulated target four 6 and the millimeter-wave radar 2 is set to be less than or equal to 0.6 meters to meet the test of the minimum blind spot distance of the millimeter-wave radar 2.

Furthermore, the arc guide rail 7 is marked with scales corresponding to the positions of the bracket 1 12 , the bracket 2 13 , and the simulated target 1 8 and the simulated target 2 9 .

Since most millimeter-wave radars 2 use phase differences of multiple receiving signal channels to measure angles, the physical length of each channel is different during manufacturing, resulting in a certain error in the millimeter-wave radar 2 when measuring the angle of the simulated target. Therefore, before testing the millimeter-wave radar 2, its receiving channel needs to be calibrated. In this embodiment, scales corresponding to the positions of bracket 12 and bracket 2 13 and simulated target 1 8 and simulated target 2 9 are marked on the arc guide rail 7 for angle calibration of the millimeter-wave radar 2. It should be noted that before measuring the angle resolution of the millimeter-wave radar 2, it is first calibrated.

Furthermore, the simulated target one 8, simulated target two 9, simulated target three 4 and simulated target four 6 in this embodiment all use corner reflectors to reduce the cost of testing the millimeter wave radar 2; in other embodiments, the simulated target one 8, simulated target two 9, simulated target three 4 and simulated target four 6 can also use a radar target simulator to achieve target simulation. The radar target simulator receives the detection signal of the millimeter wave radar 2, and returns it to the millimeter wave radar 2 after internal processing, thereby simulating the required target; in this method, the signal output port of the radar target simulator is small, the energy is more concentrated, and the amount of energy is not related to the reflection area, but is controlled by internal gain, thereby reducing the influence of the scattering area on the measurement of angular resolution, but the cost is relatively high.

Furthermore, the bracket 1 12 and the bracket 2 13 in this embodiment are arc rods with the millimeter-wave radar 2 as the center, so as to better cooperate with the arc guide rail 7; in other embodiments, the bracket 12 and the bracket 2 13 can also be straight rods. When straight rods are used, the simulated target 1 8 and the simulated target 2 9 are at different heights. When moving, the distances between the simulated target 1 8 and the simulated target 2 9 relative to the millimeter-wave radar 2 may not be equal. At this time, pay attention to arranging and installing the simulated target 1 8 and the simulated target 2 9 up and down relative to the millimeter-wave radar 2 so that the height difference between the simulated target 1 8 and the simulated target 2 9 and the millimeter-wave radar 2 is equal, so as to achieve equal distances between different simulated targets and the millimeter-wave radar 2.

The industry standard requires an RCS of 10dBsm and a corner reflector aperture of 109mm. Considering the influence of the wall thickness of the corner reflector, the minimum spacing between the two corner reflectors is greater than 110mm. If this spacing is to meet the 1° spacing, the corner reflectors need to be placed at (110/2)/sin(1°/2)=6302.6mm. Many darkrooms in the industry cannot meet this size requirement. At the same time, the reflection of a corner reflector with an RCS of 10dBsm is not a particle. For high-precision resolution, such as 1°, it is necessary to consider the influence of the corner reflector's reflection area on the measurement angle. The reflection area of the corner reflector needs to be much smaller than its spacing so that the reflection area can be equivalent to a particle.

This embodiment adopts a 10-meter darkroom, the radius of the arc track is 8 meters, the chord length at 1° is 8*sin(1°/2)*2=0.1396 meters, and a -5dBsm corner reflector is used. The corner reflector aperture accounts for 32% of the distance. Considering that the actual effective aperture of the corner reflector is about 2/3, the actual effective aperture accounts for 21% of the spacing, so as to achieve the goal of reducing costs while effectively reducing measurement errors, and realizing accurate measurement of the angle resolution and standard distance resolution of the millimeter-wave radar 2; if more accurate measurement of the millimeter-wave radar 2 is required in the later stage, a target simulator with higher investment cost is required.

At the same time, this embodiment adopts a millimeter-wave radar 2 with 16 receiving channels, the antenna spacing is half a wavelength, the simulated target 1 8 and the simulated target 2 9 are respectively placed 3.1 degrees to the left and 3.1 degrees to the right of the millimeter-wave radar 2, the simulated target 1 8 and the simulated target 2 9 are both corner reflectors, and the two corner reflectors are 21 meters, 1.5 meters and 8 meters away from the millimeter-wave radar as an example, the data of each channel is simulated based on the scene ray method, and then the target data of 16 channels are calculated according to the DBF angle measurement method commonly used in millimeter-wave radar 2 signal processing, and the angle resolution detection simulation parameter diagrams as shown in Figures 3, 4 and 5 are obtained respectively;

It can be seen from Figures 3 to 5 that as the distance of the corner reflector increases, the maximum signal amplitude decreases accordingly, and the simulation conforms to the law of electromagnetic wave spatial attenuation; it should be noted that in Figure 3, the amplitude above 70dB is the target signal, and the remaining small peaks are system noise; in Figure 4, the amplitude above 65dB is the target signal, and the remaining small peaks are system noise; in Figure 5, the amplitude above 40dB is the target signal, and the remaining small peaks are system noise. It can be seen from the figure that in Figure 3, there is only one maximum point in the target signal, and the two targets cannot be distinguished; in Figure 4, there are two maximum points in the target signal, which can distinguish the two targets; in Figure 5, there are two maximum points in the target signal, which can distinguish the two targets, and the distinction between the two maximum points is more obvious, which is conducive to stable distinction under the influence of random noise in actual situations, that is, as the spacing between corner reflectors increases, the emitting surface of the corner reflector is much smaller than the spacing, so that the reflection area of the corner reflector can be equivalent to a particle, so as to improve the measurement accuracy of the test device for millimeter wave radar.

It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims (7)

1. A high-resolution 4D radar microwave test device, characterized in that it comprises a shielding room (1), a turntable (3), a millimeter wave radar (2), an angle detection component and an index distance measurement component, wherein the length of the shielding room (1) is much greater than 6.3 meters, and an absorbing material is pasted on the inner wall of the shielding room (1). The turntable (3) is arranged on one side of the shielding room (1), and the millimeter wave radar (2) is arranged on the turntable (3) for adjusting the angle of the millimeter wave radar in the azimuth plane and the pitch plane. The angle detection component is arranged on a side of the shielding room (1) away from the turntable for detecting the angle resolution of the millimeter wave radar. The index distance measurement component is arranged between the turntable (3) and the angle detection component for measuring the index distance resolution of the millimeter wave radar. 2. The high-resolution 4D radar microwave test device as claimed in claim 1, characterized in that: the angle detection component comprises an arc guide rail (7), a bracket one (12), a bracket two (13), a simulated target one (8) and a simulated target two (9), wherein the arc guide rail (7) is an arc with the millimeter wave radar (2) as the center of the circle, the arc guide rail (7) is arranged on a side of the shielding room (1) away from the turntable (3), the bracket one (12) and the bracket two (13) are arranged on the arc guide rail (7), and the simulated target one (8) and the simulated target two (9) are respectively arranged on the bracket one (12) and the bracket two (13). 3. The high-resolution 4D radar microwave test device as described in claim 2 is characterized in that: the index distance measurement component includes a linear guide (5), a bracket three (10), a bracket four (11), a simulated target three (4) and a simulated target four (6), the linear guide (5) is longitudinally arranged in front of the turntable (3), the bracket three (10) and the bracket four (11) are arranged on the linear guide (5), and the simulated target three (4) and the simulated target four (6) are respectively arranged on the bracket three (10) and the bracket four (11). 4. The high-resolution 4D radar microwave testing device as described in claim 3 is characterized in that the minimum distance between the simulated target three (4) or the simulated target four (6) and the millimeter wave radar (2) is less than or equal to 0.6 meters. 5. The high-resolution 4D radar microwave testing device as described in claim 2 is characterized in that: the arc guide rail (7) is marked with scales corresponding to the positions of bracket one (12) and bracket two (13) and simulated target one (8) and simulated target two (9). 6. The high-resolution 4D radar microwave testing device as described in claim 3 is characterized in that: the simulated target one (8), the simulated target two (9), the simulated target three (4) and the simulated target four (6) are all corner reflectors. 7. The high-resolution 4D radar microwave testing device as described in claim 2 is characterized in that: the bracket 1 (12) and the bracket 2 (13) are arc-shaped rods with the millimeter wave radar (2) as the center.