An airborne low-scattering radome tooling and positioning device thereof

Abstract

The application relates to the technical field of aviation equipment test detection, in particular to an airborne low-scattering radome tool and a positioning device thereof. The tool comprises a rotating base arranged on the ground, a fixing mechanism arranged on the rotating base, the fixing mechanism being used for fixing and mounting an antenna radome to be detected, an installation mechanism arranged on the rotating base, the installation mechanism being used for fixing and mounting an antenna, and the antenna on the installation mechanism being capable of rotating. In the application, the fixing mechanism used for mounting the antenna radome adopts a non-shielding structure design, the antenna radome is fixed through an arc-shaped cantilever, the core and the edge area of the antenna radome which is in the form of a whole curved surface can be avoided, the electromagnetic exposure rate of the antenna radome reaches 99.8%, and through the frame made of pine wood and the sharp cone wave-absorbing pad capable of absorbing electromagnetic waves, the influence of scattering and diffraction caused by the tool can be maximally eliminated, and the accuracy of detection data is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aviation equipment test and detection, in particular to an airborne low-scattering radome tool and a positioning device thereof. BACKGROUND

[0002] As a key component for protecting the antenna system of an airplane, the radome needs to ensure the normal operation of radar, communication and other equipment in harsh environments. Its core functions include physical protection and efficient electromagnetic wave transmission. The advantages and disadvantages of the electrical performance indicators of the radome directly determine the key parameters such as radar detection distance and communication quality. The accuracy of the electrical performance test results is highly dependent on the structural design and material properties of the test tool. In the antenna darkroom test environment, the tool needs to meet the stringent requirements of no electromagnetic interference, angle adjustment, accurate positioning, etc., in order to truly reflect the actual working performance of the radome on the airplane.

[0003] The existing radome tool has the following two problems:

[0004] 1. There are problems in the structural design. The traditional support frame adopts a surrounding clamping structure or a multi-point bolt fixing, and the metal connecting piece will be directly blocked by the tool in the path of the incident electromagnetic wave. In addition, most tools do not consider the shielding problem caused by the tool. The surface reflected wave and the direct wave are superimposed at the receiving end, which will introduce standing wave effect, causing the electrical performance indicators to decline. More seriously, at high frequencies above Ka, such interference will mask the true transmission curve.

[0005] 2. The radome multi-angle domain test relies on a turntable. For narrow-beam antennas, the antenna and the radome need to be independently rotated. However, for most airborne radome electrical performance tests, there is no design of independent turntable and reset device, which cannot truly reflect the electrical performance of the edge of the radome. SUMMARY

[0006] The purpose of the present application is to provide an airborne low-scattering radome tool and a positioning device thereof to solve the problems of excessive shielding of the radome by the traditional support frame and the inability of the antenna and the radome to rotate independently. To achieve the above purpose, the present application provides the following technical solutions:

[0007] An airborne low-scattering radome tool and a positioning device thereof, comprising a rotating base arranged on the ground, a fixing mechanism arranged on the rotating base, the fixing mechanism being used for fixing and mounting a radome to be detected, and a mounting mechanism arranged on the rotating base, the mounting mechanism being used for fixing and mounting an antenna, the antenna on the mounting mechanism being capable of rotating.

[0008] Preferably, the rotating base comprises a rotating turntable arranged on the ground, a connecting bracket fixedly connected to the turntable, and a support plate fixedly connected to the connecting bracket, the support plate being made of pine wood.

[0009] Preferably, the fixing mechanism comprises a fixing frame fixedly connected to the support plate, a connecting frame fixedly connected to the fixing frame, two arc-shaped cantilevers fixedly connected to the connecting frame at two ends in symmetry, and a connecting strip fixedly connected between the two arc-shaped cantilevers, wherein the two arc-shaped cantilevers are used for fixing the radome, and the fixing frame, the connecting frame, the arc-shaped cantilevers and the connecting strip are all made of pine wood.

[0010] Preferably, the mounting mechanism comprises a mounting frame fixedly connected to the support plate, a positioning assembly arranged on the mounting frame, and a mounting frame arranged on the positioning assembly, wherein the positioning assembly can make the mounting frame rotate accurately, and the mounting frame and the mounting frame are both made of pine wood.

[0011] Preferably, the positioning assembly comprises a mounting seat fixedly connected to the mounting frame, a bearing table rotatably connected to the mounting seat, and a mounting frame fixedly connected to the bearing table, wherein a circumferential scale line is arranged on the bearing table, and a mark line is arranged on the mounting seat, and the rotation angle of the bearing table can be known by comparing the mark line and the circumferential scale line.

[0012] Preferably, the mounting frame is fixedly connected to the bearing table, a worm gear is fixedly connected to the bearing table, a connecting shell is fixedly connected to the mounting seat, a worm is rotatably connected to the connecting shell, the worm is engaged with the worm gear, a support block is fixedly connected to the mounting frame, a rotating rod is rotatably connected to the support block, one end of the rotating rod is fixedly connected to the worm through a shaft coupling, and a hand wheel is fixedly connected to the other end of the rotating rod.

[0013] Preferably, a sharp cone wave-absorbing pad is fixedly connected to the connecting support, the fixing frame, the two arc-shaped cantilevers and the mounting frame.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] In the present application, the fixing mechanism for mounting the radome adopts a non-shielding structure design, the radome is fixed through the arc-shaped cantilevers, the core and the edge area of the radome which is overall curved can be avoided, the electromagnetic exposure rate of the radome can reach 99.8%, and through the pine wood material support plate, fixing frame, connecting frame, arc-shaped cantilever, connecting strip, mounting frame and mounting frame, and the sharp cone wave-absorbing pad which can absorb electromagnetic waves, the influence of scattering and diffraction caused by the metal tooling can be maximized to eliminate, the accuracy of the detection data is ensured, and the cost of the metal tooling is relatively high, the pine wood material is used for the plurality of components in the present application, which is also to further reduce the design cost.

[0016] In the application, when the antenna cover electrical performance test is carried out, the antenna cover and the narrow beam antenna are rotated together through the rotating table, but when the antenna cover and the antenna need to be kept independent movement, through the setting of the positioning assembly, the bearing table can be driven to rotate through the rotation of the hand wheel, so that the antenna rotates independently from the antenna cover, when the antenna cover rotates at a large angle, the antenna can be reset to the original angle through the positioning assembly, the independent rotation and real-time calibration function are realized, the full-angle electrical performance detection of the antenna cover is realized, and the pattern distortion is <0.1 dB.

[0017] In the application, through the adoption of the wooden structure frame, the hollow arc-shaped cantilever connecting mechanism and the high-precision positioning assembly, the high-precision electrical performance test of the multi-angle antenna cover is realized, the overall wave permeability test error is ±0.25 dB (7 times improvement), the overall pattern distortion is <0.5 dB, the limitations of electromagnetic interference, angle shielding and positioning misalignment of the traditional scheme are broken, and the basis for field verification is provided for the airborne communication system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic diagram of the application;

[0019] Figure 2 It is the structure schematic diagram of the rotating base and the fixing mechanism in the application;

[0020] Figure 3 It is the structure schematic diagram of the mounting mechanism in the application;

[0021] Figure 4 It is the structure schematic diagram of the positioning assembly in the application Figure 1 ;

[0022] Figure 5 It is the structure schematic diagram of the positioning assembly in the application Figure 2 .

[0023] In the drawing: 1, rotating base; 101, rotating table; 102, connecting support; 103, supporting plate; 2, fixing mechanism; 201, fixing frame; 202, connecting frame; 203, arc-shaped cantilever; 204, connecting strip; 3, mounting mechanism; 301, mounting frame; 302, positioning assembly; 3021, mounting seat; 3022, bearing table; 3023, circumferential scale line; 3024, indicating line; 3025, worm gear; 3026, connecting shell; 3027, worm; 3028, supporting block; 3029, rotating rod; 30210, shaft coupling; 30211, hand wheel; 303, mounting frame; 4, sharp cone wave-absorbing pad. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0025] Please refer to Figures 1 to 5 The present application provides a technical solution:

[0026] The airborne low-scattering radome tool and its positioning device, comprising a rotating base 1 arranged on the ground, the rotating base 1 is provided with a fixing mechanism 2, the fixing mechanism 2 is used for fixing and installing the antenna cover to be detected, the rotating base 1 is further provided with a mounting mechanism 3, the mounting mechanism 3 is used for fixing and installing the antenna, the antenna on the mounting mechanism 3 can rotate.

[0027] In the embodiment, the rotating base 1 comprises a rotating table 101 arranged on the ground, the rotating table 101 is fixedly connected with a connecting bracket 102, the connecting bracket 102 is fixedly connected with a support plate 103, and the support plate 103 is made of pine.

[0028] In the embodiment, the fixing mechanism 2 comprises a fixing frame 201 fixedly connected with the support plate 103, the fixing frame 201 is fixedly connected with a connecting frame 202, two arc-shaped cantilevers 203 are fixedly connected with the connecting frame 202 at both ends in a symmetrical manner, a connecting strip 204 is fixedly connected between the two arc-shaped cantilevers 203, and the two arc-shaped cantilevers 203 are used for fixing the antenna cover. The fixing frame 201, the connecting frame 202, the arc-shaped cantilevers 203 and the connecting strip 204 are all made of pine.

[0029] In the embodiment, the mounting mechanism 3 comprises a mounting frame 301 fixedly connected with the support plate 103, the mounting frame 301 is provided with a positioning assembly 302, the positioning assembly 302 is provided with a mounting frame 303, the positioning assembly 302 can make the mounting frame 303 rotate accurately, and the mounting frame 301 and the mounting frame 303 are both made of pine.

[0030] In the embodiment, the support plate 103, the fixing frame 201, the connecting frame 202, the arc-shaped cantilever 203, the connecting strip 204, the mounting frame 301 and the mounting frame 303 all adopt wooden frame structures, the overall structure adopts pine wood, and the deformation amount is low, there is no peculiar smell, and the compressive strength is usually between 30-50 Mpa. The fixing frame 201 and the mounting frame 301 are composed of a plurality of wooden rod pieces, can form stable support, reduce weight, avoid scattering problems caused by metal tooling, and interference suppression > 15 dB.

[0031] In the embodiment, the positioning assembly 302 includes a mounting seat 3021 fixedly connected to the mounting frame 301, a bearing table 3022 rotatably connected to the mounting seat 3021, a mounting frame 303 fixedly connected to the bearing table 3022, a circumferential scale line 3023 formed on the bearing table 3022, and a mark line 3024 formed on the mounting seat 3021. The rotation angle of the bearing table 3022 can be known by comparing the mark line 3024 and the circumferential scale line 3023.

[0032] In the embodiment, the mounting frame 303 is fixedly connected to the bearing table 3022, a worm gear 3025 is fixedly connected to the bearing table 3022, a connecting shell 3026 is fixedly connected to the mounting seat 3021, a worm 3027 is rotatably connected in the connecting shell 3026, the worm 3027 is engaged with the worm gear 3025, a support block 3028 is fixedly connected to the mounting frame 301, a rotating rod 3029 is rotatably connected to the support block 3028, one end of the rotating rod 3029 is fixedly connected with the worm 3027 through a shaft coupling 30210, and a hand wheel 30211 is fixedly connected to the other end of the rotating rod 3029.

[0033] In the embodiment, the bearing table 3022 is rotatably connected to the mounting seat 3021 through a thrust ball bearing. The thrust ball bearing can effectively reduce the friction of the bearing table 3022 when rotating on the mounting seat 3021, reduce the wear of the bearing table 3022 and the mounting seat 3021, the rotation of the bearing table 3022 is driven by the worm gear 3025 and the worm 3027, the worm gear 3025 and the worm 3027 have self-locking and large transmission ratio characteristics, so that the bearing table 3022 can maintain the angle after rotation, and the rotation angle of the bearing table 3022 can be accurately adjusted, and the positioning accuracy can reach 0.05°.

[0034] In the embodiment, the connecting support 102, the fixing frame 201, the two arc-shaped cantilevers 203 and the mounting frame 301 are fixedly connected with sharp cone wave-absorbing pads 4.

[0035] In the embodiment, the material of the sharp cone wave-absorbing pad 4 is polyurethane foam, and a plurality of foam sharp cones are uniformly distributed on the surface of the sharp cone wave-absorbing pad 4. The sharp cone wave-absorbing pad 4 can effectively absorb and weaken electromagnetic waves, reduce the reflection and diffraction of electromagnetic waves by the connecting support 102, the fixing frame 201, the arc-shaped cantilever 203 and the mounting frame 301, reduce the interference on the experimental data, and ensure the accuracy of the experimental data.

[0036] The on-board low-scattering radome tool and the positioning device thereof work as follows:

[0037] The antenna is installed on the mounting frame 303, the antenna is started to emit a narrow beam signal outward, the signal data at this time is recorded, the antenna is then turned off, the radome to be detected is installed on the two arc-shaped cantilevers 203, the antenna is started again, and the signal data at this time is recorded. The signal data at two times is compared, and whether the performance of the radome meets the requirements can be known.

[0038] During the test, the orientation of the antenna and the radome can be changed by rotating the rotary table 101, so that signal data at different angles can be obtained. The worm 3027 is rotated by rotating the rod 3029 and the shaft coupling 30210 through the rotation of the hand wheel 30211, the worm wheel 3025 engaged with the worm 3027 is rotated, the bearing table 3022 fixedly connected with the worm wheel 3025 is rotated, and the mounting frame 303 and the antenna fixedly connected with the bearing table 3022 are also rotated, so that the position of the antenna facing the radome changes, and data at different angles between the antenna and the radome can be obtained. Under the cooperation of the rotary table 101 and the positioning assembly 302, the full-angle electrical performance detection of the radome can be realized.

[0039] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An airborne low-scattering radome tooling and its positioning device, comprising a rotating base (1) arranged on the ground, characterized in that: The rotating base (1) is provided with a fixing mechanism (2) for fixing and installing the antenna cover to be detected, and is further provided with a mounting mechanism (3) for fixing and installing an antenna, and the antenna on the mounting mechanism (3) can rotate; The rotating base (1) comprises a rotating table (101) rotatably arranged on the ground, the rotating table (101) is fixedly connected with a connecting bracket (102), the connecting bracket (102) is fixedly connected with a support plate (103), and the support plate (103) is made of pine wood; The fixing mechanism (2) comprises a fixing frame (201) fixedly connected with the support plate (103), the fixing frame (201) is fixedly connected with a connecting frame (202), the connecting frame (202) is fixedly connected with two arc-shaped cantilevers (203) at both ends in a symmetrical manner, and the two arc-shaped cantilevers (203) are fixedly connected with a connecting strip (204); the two arc-shaped cantilevers (203) are used for fixing the antenna cover, and the fixing frame (201), the connecting frame (202), the arc-shaped cantilevers (203) and the connecting strip (204) are all made of pine wood; The mounting mechanism (3) comprises a mounting frame (301) fixedly connected with the support plate (103), the mounting frame (301) is provided with a positioning assembly (302), the positioning assembly (302) is provided with a mounting frame (303), the positioning assembly (302) can make the mounting frame (303) rotate accurately, and the mounting frame (301) and the mounting frame (303) are both made of pine wood; The connecting bracket (102), the fixing frame (201), the two arc-shaped cantilevers (203) and the mounting frame (301) are fixedly connected with a sharp cone wave-absorbing pad (4).

2. An airborne low-scattering radome tooling and its positioning device according to claim 1, characterized in that: The positioning assembly (302) comprises a mounting seat (3021) fixedly connected with the mounting frame (301), the mounting seat (3021) is rotatably connected with a bearing table (3022), the bearing table (3022) is fixedly connected with the mounting frame (303), the bearing table (3022) is provided with a circumferential scale line (3023), the mounting seat (3021) is provided with a mark line (3024), and the rotation angle of the bearing table (3022) can be known by comparing the mark line (3024) with the circumferential scale line (3023). The bearing table (3022) is fixedly connected with a mounting frame (303), the bearing table (3022) is fixedly connected with a worm wheel (3025), the mounting seat (3021) is fixedly connected with a connecting shell (3026), the connecting shell (3026) is rotatably connected with a worm (3027), the worm (3027) is engaged with the worm wheel (3025), the mounting frame (301) is fixedly connected with a supporting block (3028), the supporting block (3028) is rotatably connected with a rotating rod (3029), one end of the rotating rod (3029) is fixedly connected with the worm (3027) through a shaft coupling (30210), and the other end of the rotating rod (3029) is fixedly connected with a hand wheel (30211).

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