A radar antenna cover auxiliary positioning tool for wave transmission performance detection

Abstract

The utility model provides a kind of radar antenna cover auxiliary positioning tool for wave-through performance detection, solve the problems of complex process, angle is difficult to control, receiving end alignment difficulties and other problems in radar antenna cover wave-through performance detection.It includes installation panel, support, lifting mechanism, pitch angle rotating mechanism and azimuth angle rotating mechanism;Support is L-shaped as a whole, including the horizontal support and vertical support connected vertically;Two opposite sides of installation panel are installed on vertical support by pitch angle rotating mechanism and fastener respectively, and can be accurately adjusted the pitch angle of itself under the assistance of pitch angle rotating mechanism;Horizontal support is coaxially installed on the lifting mechanism by azimuth angle rotating mechanism, and can rotate left and right under the assistance of azimuth angle rotating mechanism, and then accurately adjust the azimuth angle of installation panel;The intersection between the rotation center axis of horizontal support and the center axis between installation panel vertical state is the installation position of actual radar / antenna transmitting panel in radar antenna cover.

Description

Technical Field

[0001] This utility model belongs to the field of airborne radar radome repair technology, specifically relating to an auxiliary positioning fixture for radar radomes used for wave transmission performance testing. Background Technology

[0002] The primary function of a radar radome is to protect the radar / antenna system within it from any form of damage or disruption, without significantly affecting the radar / antenna's detection performance. It also serves to maintain the aircraft's aerodynamic shape as an integral part of its overall design. A typical structure utilizes glass cloth laminate and low-density aramid honeycomb material, offering excellent wave transmission and specific strength. As the "electromagnetic window" of the radar / antenna, its wave transmission performance is just as important as its mechanical properties; wave transmission rate testing is a key quality control item in radar radome repair work.

[0003] Currently, the wave transmission performance testing of radar radomes mainly follows the GJB 7954 standard, employing the wave transmission focusing lens method (e.g., Figure 9 The method described above (as shown) requires high precision in the shape and surface condition of the sample being tested. Testing the wave transmission performance of an oval-shaped radar radome typically requires checking a certain range of azimuth and elevation angles within the radar / antenna illumination area to ensure the integrity of the test. During the test, the relative position of the radome and the antenna must completely simulate the actual installation position. The testing process usually requires re-aligning the transceiver axes after each angle adjustment, resulting in complex testing procedures, difficulty in angle control, and challenges in transceiver alignment. Currently, controlling the azimuth and elevation angles mostly involves machining multiple pin holes in the fixture to achieve angle offset, which can only test a few fixed angles, lacking versatility. Furthermore, the testing process requires repeatedly inserting and removing positioning pins to change the angle, making the operation cumbersome and prolonging the testing time. To address the above-mentioned problems in testing, a radar radome auxiliary positioning fixture specifically designed for wave transmission performance testing has been developed. This fixture plays a crucial role in accurately controlling the elevation and azimuth angles, simplifying transceiver alignment operations, shortening operation time, reducing operational difficulty, and improving testing efficiency and accuracy.

[0004] Chinese patent CN107544062A discloses an auxiliary device for testing the azimuth angle of an airborne radome at large angles. It improves the structure of the transmitting antenna, solving the problem of not being able to perform large-angle azimuth angle tests in airborne radome azimuth angle testing. However, it does not provide a solution for the challenge of testing elevation angles. Extensive market research shows that most microwave anechoic chamber turntables can only perform basic azimuth angle tests and cannot perform elevation angle tests. A turntable capable of simultaneously performing azimuth and elevation angle tests needs to be designed and constructed concurrently with the microwave anechoic chamber during its initial construction phase. Achieving the same effect with existing microwave anechoic chamber turntables requires significant modifications to the infrastructure, resulting in substantial costs, long modification cycles, and no guarantee that the modifications will not affect the performance of the microwave anechoic chamber. Even if the modifications are successful, the load-bearing capacity of such turntables is limited.

[0005] Therefore, the testing of the wave transmission performance of radar radomes requires a special tooling for radar radomes that can adapt to most microwave anechoic chamber testing conditions, is low-cost, simple in structure, has good versatility, and can achieve synchronous control of azimuth and elevation angles and simplify the testing process. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the current radar radome transmission performance testing, such as complicated procedures, difficulty in angle control, difficulty in aligning the transceiver, large amount of engineering work, high investment, and long modification cycle. It provides an auxiliary positioning fixture for radar radomes for transmission performance testing. This fixture is low-cost and highly versatile, capable of simulating the position and movement angle of the radar / antenna inside the radome, keeping the transceiver stationary while adjusting the radome angle accordingly. It simultaneously controls the azimuth and elevation angles, enabling measurement at any angle. This simplifies operation, shortens testing time, and accurately controls the test angle. Furthermore, it allows for transmission performance testing of different radar radome models simply by changing the mounting panel.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A radar radome auxiliary positioning fixture for testing wave transmission performance is characterized by including a mounting panel, a bracket, a lifting mechanism, an elevation rotation mechanism, and an azimuth rotation mechanism.

[0009] The bracket is L-shaped in general, including a horizontal bracket and a vertical bracket connected vertically, which provide support for the radar radome under test;

[0010] The mounting panel is used to mount (i.e., assist in fixing) the radar radome under test. Its two opposite sides are respectively mounted on the vertical bracket by a pitch angle rotation mechanism and fasteners, and can accurately adjust its pitch angle with the assistance of the pitch angle rotation mechanism.

[0011] The horizontal support is coaxially mounted on the lifting mechanism via an azimuth rotation mechanism, and can rotate left and right with the assistance of the azimuth rotation mechanism, thereby precisely adjusting the azimuth angle of the mounting panel;

[0012] The intersection point between the rotation center axis of the horizontal support and the center axis of the mounting panel when it is in a vertical state is the actual installation position of the radar / antenna transmitting panel on the radar radome.

[0013] Furthermore, the mounting panel has a hollow center, and multiple mounting holes are evenly spaced on the same circumference of the panel surface, with the mounting holes corresponding to the mounting holes of the radar radome under test.

[0014] The mounting panel has a first through hole and a second through hole symmetrically opened on two opposite sides, with the hole axis perpendicular to the center axis of the mounting panel. The second through hole is provided with an indicator plate perpendicular to the hole axis and with a pitch angle indicator line, that is, the indicator plate is parallel to the center axis of the mounting panel.

[0015] Furthermore, the vertical support consists of two vertical rods perpendicular to the horizontal support;

[0016] The spacing between the two vertical rods is adapted to the width of the mounting panel, and the two vertical rods are symmetrically provided with a third through hole and a fourth through hole. The third through hole is provided with a pitch angle adjustment disc that is perpendicular to the hole axis and has a pitch angle scale line.

[0017] The mounting panel is mounted between two vertical rods with adjustable pitch by using a pitch angle rotation mechanism and the cooperation of the third and second through holes, as well as fasteners and the cooperation of the fourth and first through holes (for example, by using bolts to fix the mounting panel through the fourth and first through holes). The pitch angle of the mounting panel is indicated by an indicator plate with pitch angle indicator lines and a pitch angle adjustment disc with pitch angle scale lines.

[0018] Furthermore, the pitch angle rotation mechanism is used to control the pitch angle rotation, and it includes a rotating component, a positioning sleeve, and a crank handle;

[0019] The rotating component includes a coaxially connected connecting shaft and a rotating internal gear;

[0020] The positioning sleeve consists of a cavity and a positioning internal gear from one end to the other.

[0021] The crank handle consists of an external gear, a connecting rod, and a handle connected in sequence from one end to the other.

[0022] The positioning sleeve is interference-fitted onto the third through hole of the vertical bracket; the rotating internal gear of the rotating component is installed in the cavity of the positioning sleeve, and the connecting shaft is interference-fitted onto the second through hole of the mounting panel; the external gear is installed in the positioning sleeve, and it can be used with both the rotating internal gear and the positioning internal gear by adjusting its own position in the positioning sleeve. When it is in contact with the rotating internal gear, it controls the pitch angle rotation, and when it is in contact with the positioning internal gear, it positions the pitch angle.

[0023] Furthermore, the horizontal support has a fifth through hole at its center and an azimuth indicator line on its side;

[0024] The top of the lifting mechanism is a lifting platform, and a turntable is fixedly installed at the center of the lifting platform;

[0025] The turntable has a blind hole at its center and azimuth angle scale lines around its circumference (the azimuth angle scale lines are set with the turntable center as the center); wherein, the 0° scale line is located in the center position, negative angles are to the left of the 0° scale line, and positive angles are to the right of the 0° scale line.

[0026] The horizontal bracket is mounted on the turntable in an adjustable manner through the cooperation of the azimuth angle rotation mechanism with the blind hole and the fifth through hole, and the azimuth angle of the mounting panel is indicated by the cooperation of the azimuth angle indicator line and the azimuth angle scale line.

[0027] Furthermore, the azimuth rotation mechanism is an azimuth rotating shaft used to control the azimuth rotation, and it includes a rotating shaft body and a rotating shaft cap;

[0028] The main body of the rotating shaft is a stepped shaft, consisting of a first-stage rotating shaft, a second-stage rotating shaft, and a positioning end that are coaxially connected and whose diameters gradually decrease from one end to the other.

[0029] The primary rotating shaft is interference-fitted with the blind hole in the center of the turntable, and the secondary rotating shaft is clearance-fitted with the fifth through hole on the horizontal support, which are used to control the azimuth rotation; the positioning end (with external thread) extends out of the fifth through hole on the horizontal support and is threadedly engaged with the rotating shaft cap (with internal thread), which is used to limit the horizontal support.

[0030] When the turntable's central axis is vertical and the mounting panel is in a vertical position, the intersection of the central axes should correspond to the actual installation position of the radar / antenna transmitting panel inside the enclosure. This ensures the maximum accuracy of simulating the actual rotation position of the radar / antenna during use, guaranteeing the reliability of the test results. During testing, the transmitting antenna should be positioned at the intersection of the turntable's central axis and the mounting panel's central axis when they are vertical.

[0031] Furthermore, in order to avoid workplace injuries such as squeezing during handling, the mounting panel is provided with U-shaped grooves in all four directions to facilitate operation and to provide a handhold for loading and unloading the radar antenna radome under test.

[0032] Furthermore, the vertical support and the horizontal support are integrated into one piece, and reinforcing ribs are provided between the two vertical rods and the horizontal support.

[0033] Furthermore, the lifting mechanism adopts a scissor-type structure to ensure that the lifting platform can rise smoothly, avoiding the tilting phenomenon during the lifting process of traditional cylinder-type lifting machines, ensuring the safety of the radar antenna cover to the greatest extent and avoiding mechanical damage to it. Specifically, electric or pneumatic power methods can be selected to control its height according to the usage conditions.

[0034] Furthermore, in order to reduce electromagnetic reflection of the auxiliary positioning fixture, both the mounting panel and the bracket are made of polyamide (PA).

[0035] Compared with most existing methods for testing the wave transmission performance of oval-shaped radar radomes in microwave anechoic chambers, this invention has the following advantages:

[0036] 1. This tooling adopts an integrated architecture, has a simple structure, and is easy to operate. It simplifies the cumbersome procedures of traditional testing methods, saves testing time, and improves testing efficiency.

[0037] 2. This fixture can be synchronously adjusted on both axes (i.e., it can control the pitch and azimuth angles simultaneously), and the angle can be accurately adjusted according to any angle required for testing. After the angle is adjusted, there is no need to align the electrical axes of the transmitting and receiving antennas, thus avoiding the introduction of human error.

[0038] 3. Compared with the turntable modification, this tooling is cheaper, has a shorter construction period, and can meet more personalized needs;

[0039] 4. The tooling has a high degree of mechanical safety, controllable test height, and stable operation. It can ensure the required test height while avoiding mechanical damage (such as micro-cracks) to the radar radome during the height adjustment process.

[0040] 5. The mounting panel and bracket in this fixture are both made of polyamide (PA), which has low electromagnetic reflection;

[0041] 6. This tooling ensures the accuracy of the wave transmission performance test within the working area of ​​the radar radome, and guarantees the reliability of the quality inspection of the aircraft radar radome.

[0042] 7. This fixture has better versatility, can complete the adjustment and positioning at any angle, and is suitable for radar radome transmittance testing under all microwave anechoic chamber testing conditions. The transmittance performance testing of different models of radar radome products can be achieved simply by changing the mounting panel.

[0043] 8. For the client, this fixture requires only one variable to achieve transmission wave testing in any microwave anechoic chamber, and has good application prospects. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the installation panel in the tooling of this utility model;

[0045] Figure 2 This is a schematic diagram of the support structure in the tooling of this utility model;

[0046] Figure 3 This is a schematic diagram of the lifting mechanism in the tooling of this utility model;

[0047] Figure 4 This is a schematic diagram of the orientation rotation mechanism of the tooling of this utility model;

[0048] Figure 5 This is a schematic diagram of the structural composition of the pitch angle rotation mechanism in the tooling of this utility model;

[0049] Figure 6 This is a schematic diagram of the working of the pitch angle rotation mechanism in the tooling of this utility model;

[0050] Figure 7 This is a schematic diagram of the working of the radar radome auxiliary positioning fixture for wave transmission performance testing according to this utility model;

[0051] Figure 8 This is a schematic diagram showing the usage state of the tooling of this utility model;

[0052] Figure 9 This is a block diagram of an existing RTM transmittance focusing lens method testing system.

[0053] Among them, 1-mounting hole, 2-U-shaped groove, 3-first through hole, 4-second through hole, 5-pitch angle indicator line, 6-pitch angle adjustment plate, 7-third through hole, 8-pitch angle scale line, 9-fourth through hole, 10-fifth through hole, 11-azimuth angle indicator line, 12-blind hole, 13-turntable, 14-azimuth angle scale line, 15-first-stage rotating shaft, 16-second-stage rotating shaft, 17-positioning end, 18-shaft cap, 19-rotating component, 20-rotating internal gear, 21-positioning sleeve, 22-cavity, 23-positioning internal gear, 24-crank handle, 25-external gear, 26-handle, 27-mounting panel, 28-bracket, 29-lifting mechanism, 30-pitch angle rotation mechanism, 31-azimuth rotating shaft, 32-radar antenna radome under test, 33-transmitting antenna, 34-receiving antenna. Detailed Implementation

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0055] This invention utilizes two rotating mechanisms (elevation and azimuth) to arbitrarily adjust the elevation and azimuth angles according to testing requirements, eliminating the need for aligning the transmitting and receiving antenna axes. This solves the problems of complex procedures, limited angle control, difficult transceiver alignment, large-scale turntable modifications, high investment, and long modification cycles in traditional testing processes. This invention is low-cost, widely applicable, simple in structure, and easy to operate, effectively improving testing efficiency and ensuring the accuracy of radar radome transmission performance testing. Transmission performance testing of different radar radome models can be achieved simply by changing the mounting panel.

[0056] Example 1

[0057] This embodiment discloses a radar radome-assisted positioning fixture for wave transmission performance testing (see...). Figures 1-7 It includes a mounting panel, bracket, lifting mechanism, pitch angle rotation mechanism and azimuth angle rotation mechanism.

[0058] The mounting panel is used to assist in fixing the radar radome under test. It has a hollow center, and multiple mounting holes are evenly spaced along the same circumference (corresponding to the mounting holes on the radar radome under test). To prevent injuries such as crushing during handling, and to provide hand space for loading and unloading the radar radome, U-shaped grooves are provided at four points on the mounting panel for easy operation. Symmetrically, first and second through holes with their axes perpendicular to the central axis of the mounting panel are provided on opposite sides of the mounting panel. An indicator plate with a pitch angle indicator line perpendicular to the hole axis is located at the second through hole.

[0059] The bracket provides support for the radar radome under test. It is L-shaped and consists of an integrally integrated horizontal bracket and a vertical bracket. The vertical bracket comprises two vertical rods perpendicular to the horizontal bracket; the spacing between the two rods matches the width of the mounting panel, and each rod has a symmetrically arranged third and fourth through-holes. The third through-hole has a pitch adjustment dial perpendicular to its axis and equipped with pitch angle markings. The horizontal bracket is a rectangular frame structure with a fifth through-hole at its center and azimuth indicators on its sides. To enhance stability, diagonal bracing ribs are installed between the two vertical rods and the horizontal bracket.

[0060] The mounting panel is mounted between two vertical rods in an adjustable pitch configuration via a pitch angle rotation mechanism and the engagement of the third and second through holes, as well as the engagement of bolts with the fourth and first through holes. The pitch angle of the mounting panel is indicated by an indicator plate with pitch angle indicator lines and a pitch angle adjustment disc with pitch angle scale lines.

[0061] The pitch angle rotation mechanism is used to control pitch angle rotation. It includes a rotating component, a positioning sleeve, and a crank handle. The rotating component includes a coaxially connected connecting shaft and a rotating internal gear. The positioning sleeve has a cavity and a positioning internal gear arranged sequentially from one end to the other. The crank handle has an external gear, a connecting rod, and a handle arranged sequentially from one end to the other. The positioning sleeve is interference-fitted onto a third through hole. The rotating internal gear of the rotating component is installed in the cavity of the positioning sleeve, and the connecting shaft is interference-fitted onto a second through hole. The external gear is installed in the positioning sleeve and can be used in conjunction with both the rotating internal gear and the positioning internal gear. It works with the rotating internal gear to control pitch angle rotation and with the positioning internal gear to position the pitch angle.

[0062] The lifting mechanism is used to adjust the height of the support, and thus the testing height. Its top is a lifting platform with a turntable fixedly installed at its center. The bottom uses a scissor-type structure to ensure smooth lifting, avoiding the tilting phenomenon that occurs with traditional cylinder-type lifting machines. This maximizes the safety of the radar radome and prevents mechanical damage. The height can be controlled by electric or pneumatic power, depending on the usage conditions. A blind hole is located at the center of the turntable, and azimuth angle scale lines are set around the turntable's center. The 0° scale line is located in the center, negative angles are to the left of the 0° scale line, and positive angles are to the right of the 0° scale line.

[0063] The horizontal bracket is mounted on the turntable in an adjustable manner through the cooperation of the azimuth rotation mechanism with the blind hole and the fifth through hole, and the azimuth of the mounting panel is indicated by the azimuth indicator line and the azimuth angle scale line.

[0064] The azimuth rotation mechanism is an azimuth shaft used to control azimuth rotation. It includes a shaft body and a shaft cap with internal threads. The shaft body is a stepped shaft, consisting of a first-stage shaft, a second-stage shaft, and a positioning end with external threads, which are coaxially connected and have progressively smaller diameters from one end to the other. The first-stage shaft is interference-fitted with the blind hole in the center of the turntable, and the second-stage shaft is clearance-fitted with the fifth through hole on the horizontal support, used to control azimuth rotation. The positioning end with external threads extends out of the fifth through hole on the horizontal support and is threaded into the shaft cap to be threaded, used to limit the movement of the horizontal support.

[0065] When the central axis of the aforementioned turntable is in a vertical position, the intersection of the central axis and the mounting panel should correspond to the actual installation position of the radar / antenna transmitting panel inside the enclosure. This ensures the maximum possible accuracy of the simulated radar / antenna's actual rotation position during use, guaranteeing the reliability of the test results. During testing, the transmitting antenna should be positioned at the intersection of the central axis of the turntable and the central axis of the mounting panel.

[0066] To reduce electromagnetic reflection from the auxiliary positioning fixture and avoid affecting the test results, both the mounting panel and the bracket are made of polyamide (PA).

[0067] The assembly process using the radar radome-assisted positioning fixture described above is as follows:

[0068] Step 1: Connect the horizontal support to the turntable on the lifting mechanism using the azimuth pivot.

[0069] Step 2: Connect and fix the first through hole on the mounting panel to the fourth through hole on the vertical bracket with bolts; connect the second through hole on the mounting panel to the third through hole on the vertical bracket with the pitch angle rotation mechanism to fix the mounting panel 2 on the bracket;

[0070] Step 3: Lower the lifting mechanism to its lowest position;

[0071] Step 4: Push the crank handle into the inner end of the pitch angle rotation mechanism (e.g., Figure 6 As shown in position 1, the external gear engages with the rotating internal gear (at this time, the pitch angle is adjustable). Simultaneously loosen the bolts, crank the handle to level the mounting panel, and then gently pull the handle outwards until it is flush with the outer end face (e.g., ...). Figure 6 As shown in position 2, the external gear engages with the positioning internal gear (at this time, the pitch angle is fixed), and the bolts are tightened to keep the mounting panel in a horizontal state.

[0072] Step 5: Place the radar radome to be tested on the mounting panel and slowly push it toward the center. Since the mounting edge of the radome is completely attached to the mounting panel, it is difficult to adjust the position of the radar radome by external rotation. One person can adjust the position of the radar radome from the inside of the radome through the cutout in the middle of the mounting panel directly below the radome. After determining the position of the mounting hole, fix the radar radome to be tested on the mounting panel through the mounting hole and fastener.

[0073] Step 6: Push the crank handle into the inner end of the pitch angle rotation mechanism (e.g., Figure 6 As shown in position 1, the external gear engages with the rotating internal gear (at this time, the pitch angle is adjustable). Simultaneously, loosen the bolts, crank the handle to adjust the angle of the mounting panel to a vertical position, and gently pull the handle outwards until it is flush with the outer end face (e.g., ...). Figure 6 As shown in position 2, the external gear engages with the positioning internal gear (at which point the pitch angle is fixed), and the bolts are tightened to restore the angular position of the radar antenna radome on the machine, thus completing the assembly of the tooling and the product.

[0074] The method for measuring azimuth using the assembled radar radome-assisted positioning fixture described above is as follows:

[0075] Step 1: Adjust the height of the lifting mechanism to meet the test conditions;

[0076] Step 2: Insert the transmitting antenna into the radar radome under test through the cutout in the middle of the mounting panel, positioning it at the intersection of the central axes of the turntable and the mounting panel when they are vertical. Align the receiving and transmitting ends and calculate the distance. The relative positions are as follows: Figure 8 As shown;

[0077] Step 3: Adjust the azimuth angle of the radar radome according to the actual movement range of the radar / antenna within the radome: When the simulated radar / antenna azimuth angle is -α°, the test should involve rotating the radar radome α° to the right (with the heading as the reference direction), that is, aligning the azimuth angle indicator line on the horizontal support with -α° on the azimuth angle scale on the turntable; when the simulated radar / antenna azimuth angle is α°, the test should involve rotating the radar radome to the left, that is, aligning the azimuth angle indicator line with α° on the azimuth angle scale; the mounting panel should always remain vertical during the test.

[0078] Step 4: After the test is completed, remove the transmitting antenna, lower the lifting mechanism to its lowest position, and restore the mounting panel to a horizontal position using the aforementioned method. Disassemble the radar antenna radome under test and protect it.

[0079] The method for measuring the elevation angle using the assembled radar radome-assisted positioning fixture described above is as follows:

[0080] Step 1: Adjust the height of the lifting mechanism to meet the test conditions;

[0081] Step 2: Insert the transmitting antenna into the radar radome under test through the cutout in the middle of the mounting panel, positioning it at the intersection of the central axes of the turntable and the mounting panel when they are vertical. Align the receiving and transmitting ends and calculate the distance. The relative positions are as follows: Figure 8 As shown;

[0082] Step 3: Adjust the elevation angle of the radar radome according to the actual range of movement of the radar / antenna within the radome: Control the elevation angle of the radar radome through the elevation angle rotation mechanism. When the external gear in the crank is pushed into the innermost end of the elevation angle rotation mechanism (e.g., ...), the elevation angle is adjusted accordingly. Figure 6 When in position 1 (as shown), the external gear engages with the rotating internal gear, and cranking the handle controls the pitch of the mounting panel; when the external gear in the handle is pulled out to be flush with the outer end face (as shown), the external gear engages with the rotating internal gear, and cranking the handle controls the pitch of the mounting panel. Figure 6When in position 2 (as shown), the external gear engages with the internal positioning gear to position the angle; the pitch angle indicator line on the mounting panel engages with the pitch angle scale line on the angle adjustment dial to accurately indicate the pitch angle; when simulating an actual radar / antenna at an elevation angle of β°, the radar radome should be at a depression angle of β°, and when simulating an actual radar / antenna at a depression angle of β°, the radar radome should be at an elevation angle of β°. During the test, the azimuth angle indicator line on the horizontal support should always be aligned with the 0° scale line on the azimuth angle scale line on the turntable;

[0083] Step 4: After the test is completed, remove the transmitting antenna, lower the lifting mechanism to its lowest position, and restore the mounting panel to a horizontal position using the aforementioned method. Disassemble the radar antenna radome under test and protect it.

[0084] In summary, this invention features low cost and high adaptability, enabling precise and continuous adjustment of azimuth and elevation angles without relying on microwave anechoic chamber modifications, simplifying the antenna alignment process, and improving testing efficiency and accuracy.

[0085] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A radar antenna cover auxiliary positioning tool for wave-transparent performance detection, characterized in that: This includes the mounting panel, bracket, lifting mechanism, pitch rotation mechanism, and azimuth rotation mechanism; The bracket is L-shaped in general, including a horizontal bracket and a vertical bracket that are connected vertically; The mounting panel is used to mount the radar radome under test. Its two opposite sides are mounted on the vertical bracket by a pitch angle rotation mechanism and fasteners, and can accurately adjust its pitch angle with the assistance of the pitch angle rotation mechanism. The horizontal support is coaxially mounted on the lifting mechanism via an azimuth rotation mechanism, and can rotate left and right with the assistance of the azimuth rotation mechanism, thereby precisely adjusting the azimuth angle of the mounting panel; The intersection point between the rotation center axis of the horizontal support and the center axis of the mounting panel when it is in a vertical state is the actual installation position of the radar / antenna transmitting panel on the radar radome.

2. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 1, characterized in that: The mounting panel has a hollow center, and multiple mounting holes are evenly spaced on the same circumference of the panel surface. The mounting panel has a first through hole and a second through hole symmetrically opened on two opposite sides, with the hole axis perpendicular to the center axis of the mounting panel. An indicator plate with a pitch angle indicator line is provided at the second through hole, which is perpendicular to the hole axis.

3. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 1, characterized in that: The vertical support consists of two vertical rods that are perpendicular to the horizontal support. The spacing between the two vertical rods is adapted to the width of the mounting panel, and the two vertical rods are symmetrically provided with a third through hole and a fourth through hole. The third through hole is provided with a pitch angle adjustment disc that is perpendicular to the hole axis and has a pitch angle scale line. The mounting panel is mounted between two vertical rods in an adjustable pitch position by means of a pitch angle rotation mechanism and the cooperation of the third and second through holes, as well as fasteners and the cooperation of the fourth and first through holes. The pitch angle of the mounting panel is indicated by the pitch angle indicator line and the pitch angle scale line.

4. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 3, characterized in that: The pitch angle rotation mechanism includes a rotating component, a positioning sleeve, and a crank handle; The rotating component includes a coaxially connected connecting shaft and a rotating internal gear; The positioning sleeve consists of a cavity and a positioning internal gear from one end to the other. The crank handle consists of an external gear, a connecting rod, and a handle connected in sequence from one end to the other. The positioning sleeve is interference-fitted onto the third through hole; the rotating internal gear of the rotating component is installed in the cavity of the positioning sleeve, and the connecting shaft is interference-fitted onto the second through hole; the external gear is installed in the positioning sleeve, and it can be used in conjunction with both the rotating internal gear and the positioning internal gear. It works with the rotating internal gear to control the pitch angle rotation, and works with the positioning internal gear to position the pitch angle.

5. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 4, characterized in that: The horizontal support has a fifth through hole at its center and an azimuth indicator line on its side. The top of the lifting mechanism is a lifting platform, and a turntable is installed in the center of the lifting platform; The turntable has a blind hole at its center and azimuth angle scale lines around its circumference; the zero-degree scale line is located in the center. The horizontal bracket is mounted on the turntable in an adjustable manner through the cooperation of the azimuth angle rotation mechanism with the blind hole and the fifth through hole, and the azimuth angle of the mounting panel is indicated by the cooperation of the azimuth angle indicator line and the azimuth angle scale line.

6. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 5, characterized in that: The azimuth rotation mechanism is an azimuth rotating shaft, which includes a rotating shaft body and a rotating shaft cap; The main body of the rotating shaft is a stepped shaft, consisting of a first-stage rotating shaft, a second-stage rotating shaft, and a positioning end that are coaxially connected and whose diameters gradually decrease from one end to the other. The primary rotating shaft is interference-fitted with the blind hole in the center of the turntable, and the secondary rotating shaft is clearance-fitted with the fifth through hole on the horizontal support, used to control the azimuth angle rotation; the rotating shaft cap is threadedly fitted with the positioning end, used to limit the horizontal support.

7. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 6, characterized in that: The mounting panel has U-shaped grooves on all four sides to facilitate operation.

8. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 7, characterized in that: The vertical support and the horizontal support are integrated into one piece, and reinforcing ribs are provided between the two vertical rods and the horizontal support.

9. The radar radome auxiliary positioning fixture for wave transmission performance testing according to any one of claims 1-8, characterized in that: The lifting mechanism adopts a scissor-type structure.

10. The radar radome auxiliary positioning fixture for wave transmission performance testing according to claim 9, characterized in that: Both the mounting panel and the bracket are made of polyamide.

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