Radar cross section testing device and testing method

Abstract

The present application discloses a radar cross-section test device and test method. By providing an absorbing carrier, the scattering intensity of the bracket itself is effectively reduced, thereby improving the accuracy of the test. Furthermore, an angle sensor is used to obtain the rotation angle of the rotating turntable and obtain the correction angle of the absorbing carrier. The absorbing carrier is rotated by a servo motor that can accurately control the rotation angle, thereby reducing the self-scattering effect of the test device and improving the accuracy of the test results of the target to be measured.

Description

Technical Field

[0001] The present application relates to the field of microwave testing technology, and in particular to a radar cross-section testing device and method. Background Art

[0002] In recent years, Radar Cross Section (RCS) testing technology has been widely used in the field of microwave testing technology. The RCS measurement of the target to be measured can be divided into two types of testing methods: dynamic measurement and static measurement. In static measurement, the target posture can be precisely controlled, and continuous sampling is performed during the rotation process, and the measurement results are usually more regular. In contrast, in dynamic measurement, the target posture cannot be precisely controlled, the sampling posture is relatively random, and the target to be measured may experience uncertainties such as its own jitter and the swing of the canard during flight, resulting in a generally larger fluctuation range in the test results. The accuracy of the dynamic measurement result is lower than that of the static measurement.

[0003] The traditional static test method is to manually lay out a foam support, place the target under test on the foam support for rotation, and perform an RCS test. Finally, the RCS test result is obtained through software synthesis. However, the test results of this method still have certain errors and low accuracy. Summary of the Invention

[0004] The main purpose of this application is to provide a radar cross section testing device and testing method, aiming to solve the technical problem of low accuracy of static test results.

[0005] To achieve the above objectives, the present application provides a radar cross-section testing device, comprising: a support assembly, a sleeve assembly, and an angle adjustment assembly; wherein the support assembly comprises a rotating turntable and a bracket, the top end of the bracket being used to connect to a target to be measured, and the bottom end of the bracket being fixedly connected to the rotating turntable;

[0006] The sleeve assembly includes a sleeve, a sleeve bracket, a sleeve base and an absorbing carrier, wherein the absorbing carrier is sleeved on the sleeve; the sleeve bracket is used to support the sleeve and is rotatably connected to the sleeve base; the sleeve base is fixedly connected to the rotating turntable; the bracket passes through the sleeve assembly;

[0007] The angle adjustment assembly includes a transmission gear, a transmission bearing, a servo motor and an angle sensor. The transmission gear is installed under the sleeve bracket and drives the sleeve bracket to rotate through the transmission bearing; the servo motor is used to drive the absorbing carrier to rotate; the angle sensor is used to measure the rotation angle of the rotating turntable.

[0008] Optionally, an interface is provided at the top of the bracket for fixing the target to be measured.

[0009] Optionally, the bracket is made of metal.

[0010] Optionally, the sleeve and the sleeve bracket are integrally formed.

[0011] Optionally, the sleeve bracket is connected to the sleeve base through the transmission bearing.

[0012] Optionally, the type of the absorbing carrier matches the type of the target to be measured.

[0013] Optionally, the testing device further comprises an electrical control box for controlling the power system of the rotating turntable and the servo motor.

[0014] In addition, to achieve the above-mentioned purpose, the present application also provides a testing method based on the above-mentioned radar cross section testing device, comprising:

[0015] Fixing the object to be tested on the testing device;

[0016] Start the test so that the rotary table rotates along the test trajectory;

[0017] The angle sensor collects the rotation angle of the rotating turntable and obtains the correction angle of the absorbing carrier;

[0018] The servo motor drives the absorbing carrier to rotate according to the correction angle;

[0019] Obtaining a radar cross section test result of the target to be measured.

[0020] Optionally, the step of the angle sensor collecting the rotation angle of the rotating turntable and obtaining the correction angle of the absorbing carrier includes:

[0021] According to the following formula, the correction angle of the absorbing carrier is obtained:

[0022]

[0023] Among them, Φ i is the correction angle, θ i is the rotation angle, D is the rotation diameter of the rotating turntable, and R is the rotation radius of the rotating turntable.

[0024] Optionally, after the step of obtaining the test result of the radar cross section of the target to be measured, the method further includes: calibrating the test device according to the test result.

[0025] The beneficial effects that can be achieved by this application.

[0026] A radar cross-section testing device and testing method proposed in an embodiment of the present application include a support assembly, a sleeve assembly and an angle adjustment assembly; wherein the support assembly includes a rotating turntable and a bracket, the top end of the bracket is used to connect the target to be measured, and the bottom end of the bracket is fixedly connected to the rotating turntable; the sleeve assembly includes a sleeve, a sleeve bracket, a sleeve base and an absorbing carrier, and the absorbing carrier is sleeved on the sleeve; the sleeve bracket is used to support the sleeve and is rotatably connected to the sleeve base; the sleeve base is fixedly connected to the rotating turntable; the bracket passes through the sleeve assembly; the angle adjustment assembly includes a transmission gear, a transmission bearing, a servo motor and an angle sensor, the transmission gear is installed under the sleeve bracket and drives the sleeve bracket to rotate through the transmission bearing; the servo motor is used to drive the absorbing carrier to rotate; the angle sensor is used to measure the rotation angle of the rotating turntable. That is, by setting up an absorbing carrier, the scattering intensity of the bracket itself is effectively reduced, and the accuracy of the test is improved; further, an angle sensor is used to obtain the rotation angle of the rotating turntable and obtain the correction angle of the absorbing carrier. The servo motor that can accurately control the rotation angle is used to rotate the absorbing carrier, so that the self-scattering effect of the test device is reduced, and the accuracy of the test results of the target to be tested is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram (front view) of the structure of a radar cross section testing device provided in an embodiment of the present application;

[0028] Figure 2 A schematic flow chart of a radar cross section testing method provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram (top view) showing the positions of a target to be measured and an absorbing carrier in a radar cross section testing device provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of a method for obtaining a corrected angle in a radar cross section testing method provided in an embodiment of the present application;

[0031] Figure numerals: 11, rotating turntable; 12, bracket; 21, sleeve; 22, sleeve bracket; 23, sleeve base; 24, wave absorbing carrier; 31, transmission gear; 32, transmission bearing; 33, servo motor; 34, angle sensor; 4, target to be measured.

[0032] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Reference Figure 1The embodiment of the present application provides a radar cross-section test device, comprising a support assembly, a sleeve assembly and an angle adjustment assembly; wherein the support assembly comprises a rotating turntable 11 and a bracket 12, the top end of the bracket 12 is used to connect to the target 4 to be measured, and the bottom end of the bracket 12 is fixedly connected to the rotating turntable 11; the sleeve assembly comprises a sleeve 21, a sleeve bracket 22, a sleeve base 23 and an absorbing carrier 24, the absorbing carrier 24 is sleeved on the sleeve 21; the sleeve bracket 22 is used to support the sleeve 21 and is fixed to the target 4 to be measured. The sleeve base 23 is rotationally connected; the sleeve base 23 is fixedly connected to the rotating turntable 11; the bracket 12 passes through the sleeve assembly; the angle adjustment assembly includes a transmission gear 31, a transmission bearing 32, a servo motor 33 and an angle sensor 34, the transmission gear 31 is installed under the sleeve bracket 22, and drives the sleeve bracket 22 to rotate through the transmission bearing 32; the servo motor 33 is used to drive the absorbing carrier 24 to rotate; the angle sensor 34 is used to measure the rotation angle of the rotating turntable 11.

[0038] In this embodiment, the support assembly, comprising a rotating turntable 11 and a bracket 12, supports the entire test apparatus. Once the test is initiated, the turntable 11 rotates along a test trajectory, driving the test apparatus in turn. The test trajectory is typically a circle centered at one end of the turntable. The bracket 12, which supports the test target 4, is fixedly connected to the turntable 11 at its bottom.

[0039] The sleeve assembly is mainly used to set the absorbing carrier 24, which is sleeved on the sleeve 21. The number of layers of the absorbing carrier can be selected according to the length of the sleeve, etc.; the sleeve bracket 22 is used to support the sleeve 21 and the absorbing carrier 24 sleeved on the sleeve 21; the sleeve base 23 is used to support the entire sleeve assembly, and the sleeve base 23 is rotatably connected to the sleeve bracket 22 and fixedly connected to the rotating turntable 11. When the rotating turntable 11 rotates, the entire sleeve assembly is driven to move through the sleeve base 23. At the same time, the sleeve bracket 22 can drive the sleeve 21 and the absorbing carrier 24 to rotate along the axis of the sleeve 21; the sleeve assembly as a whole is a hollow structure, and the bracket 12 in the support assembly passes through the sleeve assembly and is connected to the rotating turntable 11.

[0040] The angle adjustment assembly is used to adjust the rotation angle of the absorbing carrier 24 so that the sharp point of the absorbing carrier 24 always points toward the center of the microwave feed source, minimizing the scattering intensity of the test device itself. This ensures that the target 4 under test is always in a low electromagnetic scattering test environment during the actual test process, resulting in more accurate RCS test results. In this embodiment, the transmission gear 31 is located below the sleeve bracket 22, and the transmission bearing 32 is located inside the sleeve base 23. The servo motor 33 drives the transmission gear 31 and transmission bearing 32 to rotate, thereby driving the sleeve bracket 22 to rotate. In other embodiments, the transmission gear 31 and transmission bearing 32 can also be located inside the sleeve base 23, outside the sleeve base 23, or have other positional relationships. The number of transmission gears 31 and transmission bearings 32 can also be adjusted according to actual conditions to achieve the effect of rotating the sleeve bracket 22. The servo motor 33 is used to power the rotation of the sleeve bracket 22, causing the absorber 24 to rotate a certain correction angle. The servo motor 33 converts the received electrical signal into an angular displacement or angular velocity output on the motor shaft. Compared to other motors, the servo motor 33 can precisely control the speed and position of rotation. In other embodiments, other rotation drive devices that can achieve similar results can also be used. The angle sensor 34 is used to measure the rotation angle of the rotating turntable 11. Based on this rotation angle and relevant physical quantities of the rotating turntable 11, the correction angle of the absorber 24 is determined to achieve precise control. The angle sensor 34 can be mounted on the surface of the rotating turntable 11 or placed in another location that can accurately measure the rotation angle of the rotating turntable 11.

[0041] As an optional implementation, an interface is provided at the top of the bracket 12 for fixing the target 4 to be measured.

[0042] In this embodiment, an interface is provided at the top of the bracket 12 for mounting and fixing the target 4 to ensure the stability of the target 4 during the test and prevent the target 4 from shaking or even falling due to the rotation of the rotating turntable 11.

[0043] As an optional implementation, the bracket 12 is made of metal.

[0044] In this embodiment, in the prior art, to prevent the high electromagnetic scattering intensity of the metal bracket 12 from affecting the test results, a foam material is often used to make the bracket 12 to support the target 4 to be tested. However, due to the limited strength of the foam material itself, it is difficult to support the target 4 with a large volume or weight. Therefore, the use of this method is very limited and cannot be used in large machinery such as aircraft. The bracket 12 of this embodiment is made of metal, providing high-strength support for the target 4 to be tested, ensuring the safety of the target 4 to be tested, the test equipment, the test site, and personnel. At the same time, the use of an absorbing carrier on the outside of the metal bracket 12 reduces the strong scattering problem caused by the metal material and improves the accuracy of the RCS test. In other embodiments, other materials that meet the strength requirements can also be used to make the bracket 12.

[0045] As an optional implementation, the sleeve 21 and the sleeve bracket 22 are integrally formed.

[0046] In this embodiment, the sleeve 21 and the sleeve bracket 22 can be connected by integral molding, welding, adhesion, etc., among which the integral molding connection method has the highest strength and stability.

[0047] As an optional implementation, the sleeve bracket 22 is connected to the sleeve base 23 through the transmission bearing 32 .

[0048] In this embodiment, the sleeve bracket 22 is rotatably connected to the sleeve base 23 via a transmission bearing 32 .

[0049] As an optional implementation, the type of the absorbing carrier 24 matches the type of the target 4 to be measured.

[0050] In this embodiment, a suitable absorbing carrier 24 is matched according to the type of the target 4 to be measured. In order to reduce the strong scattering of the bracket 12 itself, the absorbing carrier 24 uses a low-scattering absorbing carrier. To achieve this effect, the cross-section of the absorbing carrier 24 is usually larger than the bracket 12 and the target 4 to be measured. The bracket 12 is usually not replaced after the test device is installed. However, the size and shape of the test target 4 are different. Therefore, it is necessary to select a suitable type of absorbing carrier 24 according to the type of the target 4 to be measured, such as a diamond-shaped absorbing carrier, a ring-shaped absorbing carrier, a boat-shaped absorbing carrier, a teardrop-shaped absorbing carrier, etc. Figure 2 As shown, the cross section of the target 4 to be measured in this embodiment is triangular, and a diamond-shaped absorbing carrier of appropriate size is selected.

[0051] As an optional implementation, the testing device further includes an electrical control box for controlling the power system of the rotating turntable 11 and the servo motor 33 .

[0052] In this embodiment, the testing device further includes an electrical control box (not shown in the figure) for controlling the power system of the rotating turntable 11 and the servo motor 33. In other embodiments, other similar devices may also be used for regulation.

[0053] Reference Figure 3-Figure 4 Based on the same inventive concept as the above embodiment, the embodiment of the present application provides a radar cross section testing method, comprising:

[0054] The target 4 to be measured is fixed on the test device; the test is started so that the rotating turntable 11 rotates according to the test trajectory; the angle sensor 34 collects the rotation angle of the rotating turntable 11 and obtains the corrected angle of the absorbing carrier 24; the servo motor 33 drives the absorbing carrier 24 to rotate according to the corrected angle; and the test result of the radar scattering cross section of the target 4 to be measured is obtained.

[0055] In this embodiment, the test can be started after the target 4 to be measured is fixed on the bracket 12 at the top of the test device. After the test is started, the rotary turntable 11 rotates according to a predetermined test trajectory, which is generally a circular motion with the end of the rotary turntable 11 away from the test device as the center. During the rotation process, the angle sensor 34 collects the rotation angle and obtains the corrected angle of the absorbing carrier 24. The servo motor 33 drives the sleeve bracket 22 to rotate through the transmission gear 31 and the transmission bearing 32, and then drives the absorbing carrier 24 to rotate by the corrected angle, so that the sharp point of the absorbing carrier 24 always points to the center of the microwave feed source, thereby minimizing the scattering intensity of the test device itself, so that the target 4 to be measured is always in a low electromagnetic scattering test environment during the actual test process. Under this condition, the radar scattering cross section test is performed to obtain more accurate test results.

[0056] As an optional embodiment, the angle sensor 34 collects the rotation angle of the rotating turntable 11 and obtains the correction angle of the absorbing carrier 24, including:

[0057] The correction angle of the absorbing carrier 24 is obtained according to the following formula:

[0058]

[0059] Among them, Φ i is the correction angle, θ i is the rotation angle, D is the rotation diameter of the rotating turntable 11, and R is the rotation radius of the rotating turntable 11.

[0060] In this embodiment, if Figure 4As shown, during the rotation of the turntable 11, the tip of the absorbing carrier 24 is not always aligned with the center of the microwave feed source. The angle of the absorbing carrier 24 needs to be corrected to minimize the interference of the scattering source caused by the measuring device, so that the test results of the target 4 to be measured are more accurate.

[0061] exist Figure 4 Triangle O0OP i In the figure, D is the diameter of the rotating track of the rotating turntable 11, R is the radius of the rotating track of the rotating turntable 11, and L is the OP i The side length, θ i is the rotation angle of the rotating turntable 11, Φ i To correct the angle, the corrected angle of the absorbing carrier 24 is obtained by the following relationship:

[0062] L=D+R-2DRcos(180°-θ i )=D+R+2DRcosθ i

[0063] R=D+L-2DLcosΦ i

[0064]

[0065]

[0066] Assume that the rotation speed of the rotating turntable 11 is ω, the rotation time is t, and the rotation speed of the absorbing carrier 24 is ω i ,but:

[0067] θ i =ωt

[0068]

[0069] at this time:

[0070] at this time:

[0071]

[0072] According to this formula, the correction angle Φ of the absorbing carrier 24 can be obtained i The rotation speed of the absorbing carrier 24 is ω i That is, the rotation speed of the servo motor 33.

[0073] As an optional implementation manner, after the step of obtaining the test result of the radar cross section of the target 4 to be measured, the method further includes:

[0074] The testing device is calibrated according to the test result.

[0075] In this embodiment, based on multiple tests or comparison with standard results, if deviations are found in the test data, it may be that the transmission angle of the servo motor is inaccurate, or the measurement results of the angle sensor are inaccurate, etc. The test device can be calibrated according to the test results to ensure the accuracy of subsequent measurement results.

[0076] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A radar cross section testing device, characterized in that: It includes a support assembly, a sleeve assembly and an angle adjustment assembly; wherein the support assembly includes a rotating turntable and a bracket, the top end of the bracket is used to connect to the target to be measured, and the bottom end of the bracket is fixedly connected to the rotating turntable; The sleeve assembly includes a sleeve, a sleeve bracket, a sleeve base and an absorbing carrier, wherein the absorbing carrier is sleeved on the sleeve; the sleeve bracket is used to support the sleeve and is rotatably connected to the sleeve base; the sleeve base is fixedly connected to the rotating turntable; the bracket passes through the sleeve assembly; The angle adjustment assembly includes a transmission gear, a transmission bearing, a servo motor, and an angle sensor. The transmission gear is installed below the sleeve bracket and drives the sleeve bracket to rotate through the transmission bearing. The servo motor is used to drive the absorbing carrier to rotate. The angle sensor is used to measure the rotation angle of the rotating turntable and to obtain the correction angle of the absorbing carrier according to the following formula: Among them, Φ i is the correction angle, θ i is the rotation angle, D is the rotation diameter of the rotating turntable, and R is the rotation radius of the rotating turntable.

2. The radar cross section testing device according to claim 1, wherein: An interface is provided at the top of the bracket for fixing the target to be measured.

3. The radar cross section testing device according to claim 1, wherein: The bracket is made of metal.

4. The radar cross section testing device according to claim 1, wherein: The sleeve and the sleeve bracket are integrally formed.

5. The radar cross section testing device according to claim 1, wherein: The sleeve bracket is connected to the sleeve base through the transmission bearing.

6. The radar cross section testing device according to claim 1, wherein: The type of the absorbing carrier matches the type of the target to be measured.

7. The radar cross section testing device according to claim 1, wherein: The testing device further includes an electrical control box for controlling the electrical power systems of the rotating turntable and the servo motor.

8. A testing method based on the radar cross section testing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Fixing the object to be tested on the testing device; Start the test so that the rotary table rotates along the test trajectory; The angle sensor collects the rotation angle of the rotating turntable and obtains the correction angle of the absorbing carrier; The servo motor drives the absorbing carrier to rotate according to the correction angle; Obtaining a test result of the radar cross section of the target to be measured; The step of the angle sensor collecting the rotation angle of the rotating turntable and obtaining the correction angle of the absorbing carrier includes: According to the following formula, the correction angle of the absorbing carrier is obtained: Among them, Φ i is the correction angle, θ i is the rotation angle, D is the rotation diameter of the rotating turntable, and R is the rotation radius of the rotating turntable. The tip of the absorbing carrier is not always aligned with the center of the microwave feed source during the rotation of the rotating turntable.

9. The testing method according to claim 8, wherein: After the step of obtaining the test result of the radar cross section of the target to be measured, the method further includes: The testing device is calibrated according to the test result.

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