Elastic device for improving shielding effectiveness of satellite positioning system and carrier

Abstract

The utility model provides an elastic device for improving shielding effectiveness of a satellite positioning instrument and a carrier. The elastic device comprises an L-shaped elastic device connected between the satellite positioning instrument and a satellite positioning instrument mounting plate. The shielding device is suitable for clutter shielding of the gap between the satellite positioning instrument and the carrier, the gap between the satellite positioning instrument and the carrier is filled by utilizing the inherent elasticity of the tin bronze material to generate elastic deformation, the material size adjustment allowance is large, and the requirement of dynamic change of the gap is met; the tin bronze belt with the thickness of 0.2 mm is used as a raw material, the thin-wall plate can be manufactured in a sheet metal mode, and machining is convenient and fast; the cross section of the elastic device is L-shaped, the long edge of the L-shaped cross section is fixed with the satellite positioning instrument through a screw, the short edge of the L-shaped cross section is in elastic contact with the carrier, and the vertical edge of the L-shaped cross section forms a closed partition wall after being assembled, so that electromagnetic waves leaked by the carrier can be completely shielded; in an electromagnetic compatibility comparison test, clutter signals near a receiving frequency point can be effectively shielded, and the anti-interference capability of a satellite positioning instrument is improved by 4dB.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical components, and particularly relates to an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier. Background Art

[0002] The satellite positioning device consists of two parts: an antenna and a navigation receiver. T-shaped shock absorbers are installed in pairs on the flange of the antenna part. The satellite positioning device is fixed to the satellite positioning device mounting plate inside the carrier through shock absorber bushings with screws. Due to the certain thickness of the T-shaped shock absorbers, there is a natural gap between the satellite positioning device and the satellite positioning device mounting plate after the satellite positioning device is installed in the carrier. The clutter of various devices inside the carrier can leak into the satellite positioning device antenna through this gap. As Figure 1 shown, after the navigation receiver receives the clutter signal transmitted by the antenna, it affects the positioning accuracy of the satellite positioning device.

[0003] Therefore, a device that can shield the carrier clutter is needed. Summary of the Invention

[0004] The utility model aims to solve the problem that the carrier clutter affects the positioning accuracy of the satellite positioning device, and provides an elastic device for improving the shielding efficiency between the satellite positioning device and the carrier, including an L-shaped elastic device connected between the satellite positioning device and the satellite positioning device mounting plate. The utility model is applicable to shielding the clutter between the satellite positioning device and the carrier. By utilizing the inherent elasticity of the tin bronze material, elastic deformation is generated to fill the gap between the satellite positioning device and the carrier. The material size adjustment margin is large, meeting the requirements of dynamic change of the gap. The 0.2mm thick tin bronze strip is used as the raw material, and the thin-walled plate can be manufactured by sheet metal working, which is convenient for processing. The cross-section of the elastic device is L-shaped. The long side of the L-shaped cross-section is fixed to the satellite positioning device with screws, and the short side of the L-shaped cross-section is in elastic contact with the carrier. After the vertical side of the L-shaped cross-section is assembled, a closed partition wall is formed, which can completely shield the electromagnetic waves leaked from the carrier. In the electromagnetic compatibility comparison test, it can effectively shield the clutter signals near the receiving frequency points, and the anti-interference ability of the satellite positioning device is increased by 4dB.

[0005] The utility model provides an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier, including an L-shaped elastic device connected between the satellite positioning device and the satellite positioning device mounting plate. The L-shaped elastic device includes a first plane, a second plane, an arc surface, and a third plane connected in sequence. The first plane is perpendicular to the second plane, and the first plane is parallel to the third plane;

[0006] The first plane is connected to the satellite positioning device, and the satellite positioning device mounting plate contacts the third plane during installation;

[0007] The L-shaped elastic device is obtained by stamping an elastic metal sheet.

[0008] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the number of L-shaped elastic devices is four, and they are connected end to end in sequence to form a closed rectangular channel.

[0009] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the material of the L-shaped elastic device is tin bronze, and the thickness is 0.2 mm.

[0010] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the height of the L-shaped elastic device is 5.2 ± 0.1 mm.

[0011] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the first plane is connected to the plane of the satellite positioning device by screws, and screw mounting holes are provided on the first plane.

[0012] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the width of the first plane is greater than the width of the third plane, and the lengths are the same.

[0013] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, 45° chamfers are provided at both ends of the second plane, the arc surface, and the third plane so that two L-shaped elastic devices are connected end to end.

[0014] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the arc surface faces inwards.

[0015] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, the satellite positioning device includes an antenna, a navigation receiver, a satellite positioning device mounting plate surface connected to the outer periphery of the antenna and the navigation receiver, and a T-shaped shock absorber connected to the satellite positioning device mounting plate surface. The satellite positioning device mounting plate surface is a plane, and the satellite positioning device is connected to the satellite positioning device mounting plate surface by screws through the bushing of the T-shaped shock absorber;

[0016] The antenna includes antenna elements and an antenna cover that is hermetically connected to the outside of the antenna elements. The material of the antenna cover is a wave-transparent non-metallic material;

[0017] The first plane is connected to the satellite positioning device mounting plate surface. The T-shaped shock absorber is located outside the L-shaped elastic device. The T-shaped shock absorber passes through the satellite positioning device mounting plate surface and is connected to both the upper and lower surfaces of the satellite positioning device mounting plate surface. The third plane faces the antenna.

[0018] An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to the present utility model. As a preferred embodiment, a carrier and a quartz cover are installed on the upper part of the satellite positioning device mounting plate, and the quartz cover is located outside the carrier.

[0019] After the carrier and the quartz cover are installed, the gap between the upper surface of the mounting surface of the satellite positioning device mounting plate and the lower surface of the satellite positioning device mounting plate is smaller than the distance from the first plane to the third plane.

[0020] The elastic device of the present utility model fills the gap between the satellite positioning device and the carrier by using its own elastic deformation, and is suitable for shielding the clutter between the satellite positioning device and the carrier. The elastic device is a sheet metal bending part with an L-shaped cross section. The elastic device is fixed to the satellite positioning device by screws, and four elastic devices are placed end to end to form a closed rectangular isolation channel.

[0021] The elastic device uses 0.2 mm thick tin bronze strip QSn6.5-0.1 as the base material. Tin bronze has good electrical conductivity, high shielding effectiveness, good elasticity, strong corrosion resistance, and excellent mechanical properties, and is the preferred material for the elastic device. The initial height of the elastic device is greater than the height of the gap between the satellite positioning device and the carrier. After the whole satellite positioning device is installed in the carrier, the elastic device is compressed and undergoes elastic deformation, closely fitting into the gap between the satellite positioning device and the carrier, isolating the carrier clutter from the satellite positioning device, improving the electromagnetic compatibility performance of the satellite positioning device. At the same time, the base material of the elastic device has large elastic deformation, which can meet the requirements of the dynamic change of the gap between the satellite positioning device and the satellite positioning device mounting plate.

[0022] The present utility model has the following advantages:

[0023] (1) The present utility model proposes an elastic device, which is suitable for shielding the clutter in the gap between the satellite positioning device and the carrier. The base material of the elastic device is tin bronze strip QSn6.5-0.1, and tin bronze has good electromagnetic shielding performance, which can effectively shield the clutter in the gap between the satellite positioning device and the carrier.

[0024] (2) An elastic device related to the present utility model is a single part with a simple structure. The elastic device utilizes the inherent elasticity of the tin bronze material to generate elastic deformation, filling the gap between the satellite positioning device and the carrier. At the same time, the material itself has elasticity and a large margin for size adjustment, meeting the requirements of the dynamic change of the gap.

[0025] (3) An elastic device related to the present utility model uses 0.2 mm thick tin bronze strip as the raw material, and the thin-walled plate can be manufactured by sheet metal working, which is convenient for processing.

[0026] (4) The elastic device involved in the present utility model has an L-shaped cross-section. The long side of the L-shaped cross-section is fixed to the satellite positioning device with screws, and the short side of the L-shaped cross-section is in elastic contact with the carrier. After the vertical side of the L-shaped cross-section is assembled, a closed partition wall is formed, which can completely shield the electromagnetic waves leaked from the carrier.

[0027] (5) The elastic device involved in the present utility model can effectively shield the clutter signals near the received frequency points in the electromagnetic compatibility comparison test, and the anti-interference ability of the satellite positioning device is increased by 4 dB. Description of the Drawings

[0028] Figure 1 is the path diagram of carrier clutter leakage;

[0029] Figure 2 is the overall two-dimensional sectional view of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier;

[0030] Figure 3 is the schematic diagram of carrier clutter isolation of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier;

[0031] Figure 4 is the partial three-dimensional sectional view of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier;

[0032] Figure 5 is the top view of the assembled state of the closed rectangular channel of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier;

[0033] Figure 6 is the front view of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier;

[0034] Figure 7 is the side view of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier;

[0035] Figure 8 is the two-dimensional diagram of the closed rectangular channel of an elastic device for improving the shielding efficiency between a satellite positioning device and a carrier.

[0036] Reference Signs:

[0037] 1. Satellite positioning device; 11. Antenna; 111. Antenna element; 112. Radome; 12. Navigation receiver; 13. Mounting surface of the satellite positioning device mounting plate; 14. T-shaped shock absorber; 2. Satellite positioning device mounting plate; 3. L-shaped elastic device; 31. First plane;

[0038] 32. Second plane; 33. Arc surface; 34. Third plane; 4. Carrier; 5. Quartz cover. Detailed Embodiment

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0040] Embodiment 1

[0041] As Figures 2 to 8 shown, an elastic device for improving the shielding efficiency between a satellite positioning instrument and a carrier includes an L-shaped elastic device 3 connected between a satellite positioning instrument 1 and a satellite positioning instrument mounting plate 2. The L-shaped elastic device 3 includes a first plane 31, a second plane 32, an arc surface 33, and a third plane 34 connected in sequence. The first plane 31 is perpendicular to the second plane 32, and the first plane 31 is parallel to the third plane 34;

[0042] The first plane 31 is connected to the satellite positioning instrument 1, and the satellite positioning instrument mounting plate 2 contacts the third plane 34 during installation;

[0043] The L-shaped elastic device 3 is obtained by stamping an elastic metal sheet, with a quantity of four and connected end to end to form a closed rectangular channel. The material is tin bronze, the thickness is 0.2 mm, and the height is 5.2 ± mm;

[0044] The first plane 31 is connected to the plane of the satellite positioning instrument 1 by screws. Screw mounting holes are provided on the first plane 31. The width of the first plane 31 is greater than the width of the third plane 34, and the lengths are the same. 45° chamfers are provided at both ends of the second plane 32, the arc surface 33, and the third plane 34 so that two L-shaped elastic devices 3 are connected end to end, and the arc surface 33 faces inward.

[0045] The satellite positioning instrument 1 includes an antenna 11, a navigation receiver 12, a satellite positioning instrument mounting surface 13 connected to the outer periphery of the antenna 11 and the navigation receiver 12, and a T-shaped shock absorber 14 connected to the satellite positioning instrument mounting surface 13. The satellite positioning instrument mounting surface 13 is a plane, and the satellite positioning instrument 1 is connected to the satellite positioning instrument mounting surface 13 by screws through the bushing of the T-shaped shock absorber 14;

[0046] The antenna 11 includes antenna elements 111 and an antenna cover 112 connected to the outside of the antenna elements 111. The material of the antenna cover 112 is a wave-transparent non-metallic material;

[0047] The first plane 31 is connected to the satellite positioning instrument mounting surface 13. The T-shaped shock absorber 14 is located outside the L-shaped elastic device 3. The T-shaped shock absorber 14 passes through the satellite positioning instrument mounting surface 13 and is connected to both the upper and lower surfaces of the satellite positioning instrument mounting surface 13. The third plane 34 faces the antenna 11

[0048] The upper part of the satellite positioning instrument mounting plate 2 is provided with a carrier 4 and a quartz cover 5, and the quartz cover 5 is located outside the carrier 4.

[0049] After the carrier 4 and the quartz cover 5 are installed, the gap between the upper surface of the mounting surface 13 of the satellite positioning instrument mounting plate and the lower surface of the satellite positioning instrument mounting plate 2 is 4.5 mm.

[0050] Embodiment 2

[0051] As Figures 2 to 8 shown, an elastic device for improving the shielding efficiency between the satellite positioning instrument and the carrier is applicable to the electromagnetic shielding of the gap between the satellite positioning instrument 1 and the carrier 4. The satellite positioning instrument 1 is composed of two parts: an antenna 11 and a navigation receiver 12. The antenna elements 111 are enclosed in an antenna cover 112 made of a wave-transparent (electromagnetic waves can directly penetrate) non-metallic material. The satellite positioning instrument 1 is fixed to the carrier 4 through the satellite positioning instrument mounting plate 2. When the satellite positioning instrument 1 is installed in the carrier 4, due to the built-in shock absorber pad 14 of the satellite positioning instrument 1, a gap will be formed between the shock absorber pad 14 and the satellite positioning instrument mounting plate 2. The clutter inside the carrier passes through this gap, penetrates the antenna cover 112 of the satellite positioning instrument, and enters the antenna elements 111 of the satellite positioning instrument. The navigation receiver 12 receives the clutter signal of the antenna elements 111, and the positioning accuracy of the navigation receiver 12 is affected.

[0052] Metallic materials can shield electromagnetic signals, and the higher the conductivity of the metallic material, the more significant the shielding effect. Copper is a good conductor among metallic materials. Therefore, the raw material of the elastic device 3 needs to be selected from copper-based alloys. Copper-based alloys such as beryllium bronze and tin bronze have good elasticity and excellent mechanical properties, and are preferred materials for processing elastic parts. Beryllium in beryllium bronze is a non-environmental protection raw material and will be gradually replaced by environmentally friendly tin bronze. Therefore, the raw material of the elastic device is 0.2 mm thick tin bronze strip QSn6.5 - 0.1.

[0053] The satellite positioning instrument 1 is fixed to the carrier 4 through the satellite positioning instrument mounting plate 2. The gap between the satellite positioning instrument 1 and the satellite positioning instrument mounting plate 2 has an irregular shape. Considering the available installation space of the satellite positioning instrument 1 and the specific shape of the satellite positioning instrument mounting plate 2, the cross-section of the elastic device 3 is designed as an L shape (see Figure 7 ). The elastic device 3 is placed in the gap formed between the shock absorber pad 14 of the satellite positioning instrument and the satellite positioning instrument mounting plate 2. The long side 31 of the elastic device 3 is used to fix the satellite positioning instrument, the short side 34 of the elastic device 3 contacts the satellite positioning instrument mounting plate 2, and the bent arc section 33 of the short side 32 of the elastic device 3 is used to adjust the deformation height of the elastic device 3.

[0054] The dynamic height range of the gap formed between the vibration damping pad 14 of the satellite positioning device and the satellite positioning device mounting plate 2 is (4.5 ± 0.1) mm. The theoretical initial height of the elastic device 3 is 5.2 mm. After the elastic device is placed in the gap, the deformation range of the elastic device 3 is (5.2 - 4.6) / 5.2 = 11.5% to (5.2 - 4.4) / 5.2 = 15.4%. The elastic device 3 is bent from a 0.2-mm-thick tin bronze strip. There are processing tolerances in the processing of sheet metal bending parts. In order to make the deformation amount of the elastic device within the reasonable deformation range of 10% - 20% of the thin-wall tin bronze material, the designed initial height of the elastic device 3 is (5.2 ± 0.1) mm. At this time, the deformation amount of the elastic device 3 is between (5.1 - 4.6) / 5.1 = 10% and (5.3 - 4.4) / 5.3 = 17%, ensuring that the elastic device 3 still maintains good elasticity when the size changes and tightly fills the dynamically changing gap.

[0055] In Embodiments 1 - 2, four elastic devices 3 are connected end to end to form a closed rectangular channel (see Figure 8 ). The elastic devices 3 connected end to end tightly fill the gap through their own elastic deformation. At the same time, the vertical side 32 of the L-shaped cross-section of the elastic device 3 forms a closed partition wall between the satellite positioning device 1 and the satellite positioning device mounting plate 2, realizing electromagnetic and physical isolation between the satellite positioning device and the carrier, effectively shielding the external clutter of the carrier outside the satellite positioning device, and ensuring the positioning accuracy of the satellite positioning device.

[0056] The T-shaped shock absorber 14 is made by pressing damping rubber compound. The T-shaped shock absorbers 14 are usually used in pairs. After the large end and the small end of the bushing of the shock absorber 14 pass through one T-shaped shock absorber each, they are installed on the flange of the antenna part (see Figure 2 ). The T-shaped shock absorber 14 is always in a pre-compressed state on the flange. When the carrier is in a dynamic (vibration or impact) environment, the pre-compressed T-shaped shock absorber 14 plays a role in shock absorption and buffering through deformation. The deformation size of the T-shaped shock absorber 14 varies with the environment of the carrier. Since the thickness of the T-shaped shock absorber is positively correlated with the deformation size of the T-shaped shock absorber, the gap between the satellite positioning device and the satellite positioning device mounting plate is also dynamically changing, and the L-shaped elastic device 3 can make up for the clutter leakage caused by this part of the gap.

[0057] An electromagnetic compatibility comparison test was carried out on the satellite positioning device 1 without the elastic device 3 and the satellite positioning device 1 with the elastic device 3 installed: The satellite positioning device 2 without the elastic device 3 allows the clutter inside the carrier 4 to enter the navigation receiver 12 through the antenna 11, affecting the normal satellite acquisition and positioning of the satellite positioning device 1; The satellite positioning device 1 with the elastic device 3 installed effectively isolates the clutter inside the carrier 4 outside the antenna 11 and cannot enter the navigation receiver 12. The satellite positioning device 1 has normal satellite acquisition and positioning, and the anti-interference ability of the satellite positioning device is improved by 4 dB.

[0058] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. An elastic device for improving the shielding efficiency between a satellite locator and a carrier, characterized in that: It includes an L-shaped elastic device (3) connected between a satellite positioning device (1) and a satellite positioning device mounting plate (2). The L-shaped elastic device (3) includes a first plane (31), a second plane (32), an arc surface (33), and a third plane (34) connected in sequence. The first plane (31) is perpendicular to the second plane (32), and the first plane (31) is parallel to the third plane (34). The first plane (31) is connected to the satellite positioning device (1), and the satellite positioning device mounting plate (2) contacts the third plane (34) during installation. The L-shaped elastic device (3) is obtained by stamping an elastic metal sheet.

2. The elastic device for improving the shielding efficiency between a satellite locator and a carrier according to claim 1, wherein: The number of the L-shaped elastic devices (3) is four, and they are connected end to end to form a closed rectangular channel.

3. An elastic device for improving the shielding efficiency between a satellite positioning device and a carrier according to claim 1, characterized in that: The material of the L-shaped elastic device (3) is tin bronze, and the thickness is 0.2 mm.

4. An elastic device for improving the shielding effectiveness between a satellite positioning device and a carrier according to claim 1, wherein: The height of the L-shaped elastic device (3) is 5.2 ± 0.1 mm.

5. An elastic device for improving the shielding efficiency between a satellite positioning device and a carrier according to claim 1, characterized in that: The first plane (31) is connected to the plane of the satellite positioning device (1) by screws, and screw mounting holes are provided on the first plane (31).

6. The elastic device for improving the shielding efficiency between a satellite locator and a carrier according to claim 1, characterized in that: The width of the first plane (31) is greater than the width of the third plane (34), and the lengths are the same.

7. An elastic device for improving the shielding efficiency between a satellite positioning device and a carrier according to claim 1, characterized in that: 45° chamfers are provided at both ends of the second plane (32), the arc surface (33), and the third plane (34) so that two L-shaped elastic devices (3) are connected end to end.

8. An elastic device for improving the shielding efficiency between a satellite positioning device and a carrier according to claim 1, characterized in that: The arc surface (33) faces inwards.

9. An elastic device for improving the shielding efficiency between a satellite positioning device and a carrier according to claim 1, characterized in that: The satellite positioning device (1) includes an antenna (11), a navigation receiver (12), a satellite positioning device mounting plate mounting surface (13) connected to the outer periphery of the antenna (11) and the navigation receiver (12), and a T-shaped shock absorber (14) connected to the satellite positioning device mounting plate mounting surface (13). The satellite positioning device mounting plate mounting surface (13) is a plane, and the satellite positioning device (1) is connected to the satellite positioning device mounting plate mounting surface (13) by screws through the bushing of the T-shaped shock absorber (14). The antenna (11) includes antenna elements (111) and an antenna cover (112) connected enclosing the outside of the antenna elements (111). The material of the antenna cover (112) is a wave-transparent non-metallic material. The first plane (31) is connected to the satellite positioning device mounting plate mounting surface (13). The T-shaped shock absorber (14) is located outside the L-shaped elastic device (3). The T-shaped shock absorber (14) passes through the satellite positioning device mounting plate mounting surface (13) and is connected to both the upper and lower surfaces of the satellite positioning device mounting plate mounting surface (13). The third plane (34) faces the antenna (11).

10. An elastic device for improving the shielding effectiveness between a satellite locator and a carrier according to claim 9, characterized in that: A carrier (4) and a quartz cover (5) are mounted on the upper part of the satellite positioning device mounting plate (2), and the quartz cover (5) is located outside the carrier (4). After the carrier (4) and the quartz cover (5) are mounted, the gap between the upper surface of the satellite positioning device mounting plate mounting surface (13) and the lower surface of the satellite positioning device mounting plate (2) is smaller than the distance from the first plane (31) to the third plane (34).

Images